| City | County | Population (2017) |
Land Ares Square Miles |
Density per Sq Mile |
|---|---|---|---|---|
| Abingdon | Knox County | 3,051 | 1 | 3051 |
| Abington | Mercer County | 360 | 37 | 10 |
| Adair | McDonough County | 111 | 0 | 0 |
| Adams | LaSalle County | 1,555 | 33 | 47 |
| Addieville | Washington County | 238 | 1 | 238 |
| Addison | DuPage County | 36,482 | 10 | 3648 |
| Addison (Township) | DuPage County | 89,121 | 32 | 2785 |
| Aetna | Logan County | 512 | 35 | 15 |
| Afton | DeKalb County | 860 | 35 | 25 |
| Akron | Peoria County | 1,029 | 36 | 29 |
| Alba | Henry County | 213 | 36 | 6 |
| Albany | Whiteside County | 863 | 1 | 863 |
| Albany (Township) | Whiteside County | 1,030 | 12 | 86 |
| Albers | Clinton County | 1,135 | 1 | 1135 |
| Albion | Edwards County | 1,899 | 2 | 950 |
| Alden | McHenry County | 1,355 | 33 | 41 |
| Aledo | Mercer County | 3,432 | 2 | 1716 |
| Alexis | Mercer County / Warren County | 777 | 0 | 0 |
| Algonquin | Kane County / McHenry County | 30,897 | 12 | 2575 |
| Algonquin (Township) | McHenry County | 87,371 | 46 | 1899 |
| Alhambra | Madison County | 650 | 1 | 650 |
| Alhambra (Township) | Madison County | 1,629 | 35 | 47 |
| Allen | LaSalle County | 544 | 36 | 15 |
| Allendale | Wabash County | 477 | 0 | 0 |
| Allens Grove | Mason County | 534 | 36 | 15 |
| Allenville | Moultrie County | 141 | 1 | 141 |
| Allerton | Champaign County / Vermilion County | 266 | 1 | 266 |
| Allin | McLean County | 901 | 36 | 25 |
| Allison | Lawrence County | 236 | 45 | 5 |
| Alma | Marion County | 303 | 1 | 303 |
| Alma (Township) | Marion County | 791 | 37 | 21 |
| Alorton | St. Clair County | 1,901 | 2 | 951 |
| Alpha | Henry County | 635 | 0 | 0 |
| Alsey | Scott County | 210 | 1 | 210 |
| Alsip | Cook County | 18,709 | 7 | 2673 |
| Altamont | Effingham County | 2,339 | 1 | 2339 |
| Alto | Lee County | 532 | 35 | 15 |
| Alto Pass | Union County | 362 | 2 | 181 |
| Alton | Madison County | 26,208 | 15 | 1747 |
| Alton (Township) | Madison County | 26,208 | 15 | 1747 |
| Altona | Knox County | 497 | 1 | 497 |
| Alvan | Vermilion County | 249 | 1 | 249 |
| Amboy | Lee County | 2,321 | 6 | 387 |
| Amboy (Township) | Lee County | 2,887 | 35 | 82 |
| Amity | Livingston County | 813 | 36 | 23 |
| Anchor | McLean County | 140 | 0 | 0 |
| Anchor (Township) | McLean County | 280 | 37 | 8 |
| Andalusia | Rock Island County | 1,148 | 1 | 1148 |
| Andalusia (Township) | Rock Island County | 2,251 | 13 | 173 |
| Anderson | Clark County | 390 | 32 | 12 |
| Andover | Henry County | 572 | 1 | 572 |
| Andover (Township) | Henry County | 936 | 37 | 25 |
| Anna | Union County | 4,100 | 4 | 1025 |
| Annawan | Bureau County / Henry County | 853 | 2 | 427 |
| Annawan (Township) | Henry County | 1,071 | 36 | 30 |
| Antioch | Lake County | 14,175 | 8 | 1772 |
| Antioch (Township) | Lake County | 27,115 | 35 | 775 |
| Appanoose | Hancock County | 403 | 26 | 16 |
| Apple Canyon Lake | Jo Daviess County | 413 | 4 | 103 |
| Apple River | Jo Daviess County | 343 | 1 | 343 |
| Apple River (Township) | Jo Daviess County | 468 | 19 | 25 |
| Arcola | Douglas County | 2,831 | 2 | 1416 |
| Arcola (Township) | Douglas County | 3,221 | 54 | 60 |
| Arenzville | Cass County | 367 | 1 | 367 |
| Arenzville (Township) | Cass County | 687 | 37 | 19 |
| Argenta | Macon County | 877 | 1 | 877 |
| Arispie | Bureau County | 721 | 36 | 20 |
| Arlington | Bureau County | 181 | 0 | 0 |
| Arlington Heights | Cook County | 74,760 | 17 | 4398 |
| Armington | Tazewell County | 323 | 0 | 0 |
| Aroma | Kankakee County | 4,870 | 37 | 132 |
| Aroma Park | Kankakee County | 682 | 2 | 341 |
| Arrington | Wayne County | 389 | 17 | 23 |
| Arrowsmith | McLean County | 276 | 0 | 0 |
| Arrowsmith (Township) | McLean County | 481 | 36 | 13 |
| Artesia | Iroquois County | 852 | 57 | 15 |
| Arthur | Douglas County / Moultrie County | 2,200 | 1 | 2200 |
| Ash Grove | Iroquois County | 672 | 61 | 11 |
| Ash Grove | Shelby County | 468 | 42 | 11 |
| Ashkum | Iroquois County | 693 | 1 | 693 |
| Ashkum (Township) | Iroquois County | 1,412 | 62 | 23 |
| Ashland | Cass County | 1,191 | 1 | 1191 |
| Ashland (Township) | Cass County | 1,244 | 18 | 69 |
| Ashley | Washington County | 490 | 1 | 490 |
| Ashley (Township) | Washington County | 760 | 24 | 32 |
| Ashmore | Coles County | 749 | 1 | 749 |
| Ashmore (Township) | Coles County | 1,297 | 54 | 24 |
| Ashton | Lee County | 891 | 1 | 891 |
| Ashton (Township) | Lee County | 1,090 | 18 | 61 |
| Assumption | Christian County | 1,066 | 1 | 1066 |
| Assumption (Township) | Christian County | 1,298 | 43 | 30 |
| Astoria | Fulton County | 1,036 | 1 | 1036 |
| Astoria (Township) | Fulton County | 1,344 | 36 | 37 |
| Athens | Menard County | 1,908 | 2 | 954 |
| Athensville | Greene County | 322 | 36 | 9 |
| Atkinson | Henry County | 964 | 2 | 482 |
| Atkinson (Township) | Henry County | 1,240 | 35 | 35 |
| Atlanta | Logan County | 1,600 | 1 | 1600 |
| Atlanta (Township) | Logan County | 1,820 | 24 | 76 |
| Atlas | Pike County | 539 | 64 | 8 |
| Atwood | Douglas County / Piatt County | 1,158 | 1 | 1158 |
| Auburn | Clark County | 223 | 16 | 14 |
| Auburn | Sangamon County | 4,623 | 4 | 1156 |
| Auburn (Township) | Sangamon County | 6,075 | 36 | 169 |
| Audubon | Montgomery County | 517 | 54 | 10 |
| Augusta | Hancock County | 543 | 1 | 543 |
| Augusta (Township) | Hancock County | 739 | 38 | 19 |
| Aurora | DuPage County / Kane County / Kendall County / Will County | 197,757 | 45 | 4395 |
| Aurora (Township) | Kane County | 146,557 | 35 | 4187 |
| Austin | Macon County | 203 | 37 | 5 |
| Aux Sable | Grundy County | 13,437 | 29 | 463 |
| Ava | Jackson County | 612 | 1 | 612 |
| Avena | Fayette County | 1,934 | 36 | 54 |
| Aviston | Clinton County | 2,136 | 2 | 1068 |
| Avoca | Livingston County | 382 | 36 | 11 |
| Avon | Fulton County / Warren County | 714 | 0 | 0 |
| Avon | Lake County | 63,605 | 22 | 2891 |
| Ayers | Champaign County | 439 | 23 | 19 |
| Bainbridge | Schuyler County | 575 | 44 | 13 |
| Bald Bluff | Henderson County | 304 | 42 | 7 |
| Bald Hill | Jefferson County | 748 | 36 | 21 |
| Baldwin | Randolph County | 340 | 1 | 340 |
| Ball | Sangamon County | 7,078 | 30 | 236 |
| Banner | Effingham County | 449 | 18 | 25 |
| Banner | Fulton County | 182 | 1 | 182 |
| Banner (Township) | Fulton County | 357 | 29 | 12 |
| Bannockburn | Lake County | 1,506 | 2 | 753 |
| Bardolph | McDonough County | 232 | 1 | 232 |
| Barnett | De Witt County | 397 | 37 | 11 |
| Barnhill | Wayne County | 583 | 34 | 17 |
| Barr | Macoupin County | 317 | 37 | 9 |
| Barren | Franklin County | 483 | 21 | 23 |
| Barrington | Cook County / Lake County | 10,217 | 5 | 2043 |
| Barrington (Township) | Cook County | 15,962 | 35 | 456 |
| Barrington Hills | Cook County / Kane County / Lake County / McHenry County | 4,190 | 27 | 155 |
| Barry | Pike County | 1,247 | 1 | 1247 |
| Barry (Township) | Pike County | 1,587 | 39 | 41 |
| Bartelso | Clinton County | 610 | 0 | 0 |
| Bartlett | Cook County / DuPage County / Kane County | 40,647 | 16 | 2540 |
| Bartonville | Peoria County | 6,113 | 8 | 764 |
| Batavia | DuPage County / Kane County | 26,420 | 11 | 2402 |
| Batavia (Township) | Kane County | 35,973 | 18 | 1999 |
| Batchtown | Calhoun County | 198 | 2 | 99 |
| Bath | Mason County | 308 | 0 | 0 |
| Bath (Township) | Mason County | 802 | 67 | 12 |
| Bay View Gardens | Woodford County | 412 | 1 | 412 |
| Baylis | Pike County | 196 | 0 | 0 |
| Beach Park | Lake County | 13,701 | 7 | 1957 |
| Bear Creek | Christian County | 458 | 36 | 13 |
| Bear Creek | Hancock County | 317 | 36 | 9 |
| Bear Grove | Fayette County | 577 | 37 | 16 |
| Beardstown | Cass County | 5,446 | 4 | 1362 |
| Beardstown (Township) | Cass County | 6,187 | 26 | 238 |
| Beason | Logan County | 184 | 1 | 184 |
| Beaucoup | Washington County | 575 | 38 | 15 |
| Beaver | Iroquois County | 481 | 34 | 14 |
| Beaver Creek | Hamilton County | 260 | 37 | 7 |
| Beaverville | Iroquois County | 326 | 0 | 0 |
| Beaverville (Township) | Iroquois County | 559 | 38 | 15 |
| Beckemeyer | Clinton County | 1,008 | 1 | 1008 |
| Bedford | Wayne County | 1,034 | 34 | 30 |
| Bedford Park | Cook County | 604 | 6 | 101 |
| Beecher | Will County | 4,427 | 3 | 1476 |
| Beecher City | Effingham County | 453 | 1 | 453 |
| Belgium | Vermilion County | 367 | 0 | 0 |
| Belknap | Johnson County | 106 | 1 | 106 |
| Bell Plain | Marshall County | 360 | 37 | 10 |
| Belle Prairie | Livingston County | 127 | 23 | 6 |
| Belle Rive | Jefferson County | 350 | 1 | 350 |
| Belleville | St. Clair County | 40,897 | 23 | 1778 |
| Bellevue | Peoria County | 2,049 | 2 | 1025 |
| Bellflower | McLean County | 344 | 0 | 0 |
| Bellflower (Township) | McLean County | 568 | 49 | 12 |
| Bellmont | Wabash County | 267 | 0 | 0 |
| Bellwood | Cook County | 18,672 | 2 | 9336 |
| Belmont | Iroquois County | 2,382 | 36 | 66 |
| Belvidere | Boone County | 25,143 | 12 | 2095 |
| Belvidere (Township) | Boone County | 29,623 | 36 | 823 |
| Bement | Piatt County | 1,667 | 1 | 1667 |
| Bement (Township) | Piatt County | 1,829 | 48 | 38 |
| Benld | Macoupin County | 1,422 | 1 | 1422 |
| Bennington | Marshall County | 1,500 | 36 | 42 |
| Bensenville | Cook County / DuPage County | 18,044 | 5 | 3609 |
| Benson | Woodford County | 409 | 0 | 0 |
| Benton | Franklin County | 6,851 | 5 | 1370 |
| Benton | Lake County | 18,711 | 15 | 1247 |
| Benton (Township) | Franklin County | 8,684 | 36 | 241 |
| Berkeley | Cook County | 5,048 | 1 | 5048 |
| Berlin | Bureau County | 704 | 37 | 19 |
| Berlin | Sangamon County | 174 | 1 | 174 |
| Bernadotte | Fulton County | 259 | 38 | 7 |
| Berreman | Jo Daviess County | 147 | 18 | 8 |
| Berry | Wayne County | 338 | 38 | 9 |
| Berwick | Warren County | 317 | 36 | 9 |
| Berwyn | Cook County | 54,391 | 4 | 13598 |
| Berwyn (Township) | Cook County | 54,391 | 4 | 13598 |
| Bethalto | Madison County | 9,210 | 8 | 1151 |
| Bethany | Moultrie County | 1,239 | 1 | 1239 |
| Bethel | McDonough County | 298 | 37 | 8 |
| Beverly | Adams County | 394 | 37 | 11 |
| Bible Grove | Clay County | 323 | 35 | 9 |
| Big Grove | Kendall County | 1,687 | 36 | 47 |
| Big Mound | Wayne County | 1,684 | 52 | 32 |
| Big Rock | Kane County | 1,129 | 4 | 282 |
| Big Rock (Township) | Kane County | 1,849 | 35 | 53 |
| Big Spring | Shelby County | 688 | 29 | 24 |
| Biggsville | Henderson County | 278 | 0 | 0 |
| Biggsville (Township) | Henderson County | 492 | 37 | 13 |
| Bird | Macoupin County | 289 | 36 | 8 |
| Birmingham | Schuyler County | 137 | 38 | 4 |
| Bishop | Effingham County | 1,363 | 35 | 39 |
| Bishop Hill | Henry County | 122 | 1 | 122 |
| Bismarck | Vermilion County | 530 | 1 | 530 |
| Blackberry | Kane County | 15,613 | 35 | 446 |
| Blackhawk | Rock Island County | 9,650 | 28 | 345 |
| Blair | Clay County | 607 | 36 | 17 |
| Blandinsville | McDonough County | 595 | 1 | 595 |
| Blandinsville (Township) | McDonough County | 775 | 37 | 21 |
| Blissville | Jefferson County | 397 | 35 | 11 |
| Bloom | Cook County | 88,499 | 46 | 1924 |
| Bloomingdale | DuPage County | 21,779 | 7 | 3111 |
| Bloomingdale (Township) | DuPage County | 110,636 | 34 | 3254 |
| Bloomington | McLean County | 77,330 | 27 | 2864 |
| Bloomington (Township) | McLean County | 2,820 | 21 | 134 |
| Bloomington City | McLean County | 77,330 | 27 | 2864 |
| Blount | Vermilion County | 3,186 | 51 | 62 |
| Blue Island | Cook County | 22,899 | 4 | 5725 |
| Blue Mound | Macon County | 1,072 | 1 | 1072 |
| Blue Mound | McLean County | 434 | 38 | 11 |
| Blue Mound (Township) | Macon County | 844 | 33 | 26 |
| Blue Ridge | Piatt County | 1,414 | 64 | 22 |
| Bluff Springs | Cass County | 803 | 58 | 14 |
| Bluffdale | Greene County | 511 | 45 | 11 |
| Bluffs | Scott County | 659 | 1 | 659 |
| Bluford | Jefferson County | 669 | 2 | 335 |
| Bois D'Arc | Montgomery County | 894 | 55 | 16 |
| Bolingbrook | DuPage County / Will County | 74,545 | 25 | 2982 |
| Bolo | Washington County | 404 | 37 | 11 |
| Bond | Lawrence County | 611 | 35 | 17 |
| Bondville | Champaign County | 431 | 0 | 0 |
| Bone Gap | Edwards County | 234 | 1 | 234 |
| Bonfield | Kankakee County | 356 | 0 | 0 |
| Bonnie | Jefferson County | 381 | 1 | 381 |
| Bonpas | Richland County | 372 | 38 | 10 |
| Bonus | Boone County | 4,270 | 36 | 119 |
| Boody | Macon County | 304 | 1 | 304 |
| Boone | Boone County | 1,938 | 24 | 81 |
| Boulder Hill | Kendall County | 8,973 | 1 | 8973 |
| Bourbon | Douglas County | 4,046 | 43 | 94 |
| Bourbonnais | Kankakee County | 19,462 | 9 | 2162 |
| Bourbonnais (Township) | Kankakee County | 40,149 | 42 | 956 |
| Bowdre | Douglas County | 650 | 48 | 14 |
| Bowen | Hancock County | 457 | 0 | 0 |
| Bowlesville | Gallatin County | 164 | 39 | 4 |
| Bowling | Rock Island County | 3,326 | 37 | 90 |
| Bowling Green | Fayette County | 446 | 26 | 17 |
| Boynton | Tazewell County | 264 | 30 | 9 |
| Braceville | Grundy County / Will County | 759 | 3 | 253 |
| Braceville (Township) | Grundy County | 6,239 | 18 | 347 |
| Bradford | Lee County | 303 | 36 | 8 |
| Bradford | Stark County | 682 | 0 | 0 |
| Bradley | Jackson County | 1,822 | 45 | 40 |
| Bradley | Kankakee County | 15,314 | 7 | 2188 |
| Braidwood | Grundy County / Will County | 6,186 | 5 | 1237 |
| Breese | Clinton County | 4,483 | 3 | 1494 |
| Breese (Township) | Clinton County | 5,465 | 37 | 148 |
| Bremen | Cook County | 107,415 | 38 | 2827 |
| Brenton | Ford County | 874 | 36 | 24 |
| Bridgeport | Lawrence County | 1,705 | 1 | 1705 |
| Bridgeport (Township) | Lawrence County | 2,150 | 16 | 134 |
| Bridgeview | Cook County | 16,096 | 4 | 4024 |
| Brighton | Jersey County / Macoupin County | 2,131 | 2 | 1066 |
| Brighton (Township) | Macoupin County | 3,831 | 36 | 106 |
| Brimfield | Peoria County | 828 | 1 | 828 |
| Brimfield (Township) | Peoria County | 1,180 | 36 | 33 |
| Bristol | Kendall County | 30,008 | 28 | 1072 |
| Broadlands | Champaign County | 337 | 0 | 0 |
| Broadview | Cook County | 7,618 | 2 | 3809 |
| Broadwell | Logan County | 136 | 0 | 0 |
| Broadwell (Township) | Logan County | 3,486 | 33 | 106 |
| Brocton | Edgar County | 293 | 1 | 293 |
| Brookfield | Cook County | 18,310 | 3 | 6103 |
| Brookfield | LaSalle County | 1,038 | 44 | 24 |
| Brooklyn | Lee County | 743 | 36 | 21 |
| Brooklyn | Schuyler County | 193 | 37 | 5 |
| Brooklyn | St. Clair County | 698 | 1 | 698 |
| Brookport | Massac County | 826 | 1 | 826 |
| Brookside | Clinton County | 5,356 | 24 | 223 |
| Brookville | Ogle County | 228 | 18 | 13 |
| Broughton | Hamilton County | 186 | 2 | 93 |
| Broughton | Livingston County | 293 | 35 | 8 |
| Brouilletts Creek | Edgar County | 205 | 32 | 6 |
| Brown | Champaign County | 2,036 | 36 | 57 |
| Browning | Franklin County | 2,350 | 36 | 65 |
| Browning | Schuyler County | 123 | 0 | 0 |
| Browning (Township) | Schuyler County | 352 | 29 | 12 |
| Browns | Edwards County | 129 | 0 | 0 |
| Brownstown | Fayette County | 727 | 1 | 727 |
| Bruce | LaSalle County | 12,370 | 17 | 728 |
| Brushy | Saline County | 718 | 34 | 21 |
| Brushy Mound | Macoupin County | 673 | 35 | 19 |
| Brussels | Calhoun County | 131 | 1 | 131 |
| Bryant | Fulton County | 213 | 0 | 0 |
| Buck | Edgar County | 281 | 34 | 8 |
| Buckeye | Stephenson County | 1,271 | 36 | 35 |
| Buckhart | Christian County | 1,688 | 59 | 29 |
| Buckheart | Fulton County | 1,366 | 35 | 39 |
| Buckingham | Kankakee County | 278 | 0 | 0 |
| Buckley | Iroquois County | 542 | 0 | 0 |
| Buckner | Franklin County | 440 | 1 | 440 |
| Buda | Bureau County | 501 | 1 | 501 |
| Buena Vista | Schuyler County | 1,687 | 36 | 47 |
| Buffalo | Ogle County | 2,610 | 34 | 77 |
| Buffalo | Sangamon County | 480 | 0 | 0 |
| Buffalo Grove | Cook County / Lake County | 40,494 | 9 | 4499 |
| Buffalo Hart | Sangamon County | 168 | 23 | 7 |
| Buffalo Prairie | Rock Island County | 800 | 46 | 17 |
| Bull Valley | McHenry County | 1,084 | 9 | 120 |
| Bulpitt | Christian County | 201 | 0 | 0 |
| Buncombe | Johnson County | 203 | 1 | 203 |
| Bunker Hill | Macoupin County | 1,687 | 1 | 1687 |
| Bunker Hill (Township) | Macoupin County | 3,176 | 36 | 88 |
| Burbank | Cook County | 28,289 | 4 | 7072 |
| Bureau | Bureau County | 233 | 36 | 6 |
| Bureau Junction | Bureau County | 300 | 1 | 300 |
| Burgess | Bond County | 2,272 | 37 | 61 |
| Burlington | Kane County | 620 | 7 | 89 |
| Burlington (Township) | Kane County | 1,918 | 34 | 56 |
| Burnham | Cook County | 4,088 | 2 | 2044 |
| Burns | Henry County | 259 | 36 | 7 |
| Burnt Prairie (Township) | White County | 315 | 54 | 6 |
| Burr Ridge | Cook County / DuPage County | 10,758 | 7 | 1537 |
| Burritt | Winnebago County | 912 | 33 | 28 |
| Burton | Adams County | 871 | 38 | 23 |
| Burton | McHenry County | 4,898 | 11 | 445 |
| Bush | Williamson County | 267 | 0 | 0 |
| Bushnell | McDonough County | 2,866 | 2 | 1433 |
| Bushnell (Township) | McDonough County | 3,008 | 18 | 167 |
| Butler | Montgomery County | 165 | 1 | 165 |
| Butler | Vermilion County | 910 | 72 | 13 |
| Butler Grove | Montgomery County | 722 | 36 | 20 |
| Button | Ford County | 255 | 34 | 8 |
| Byron | Ogle County | 3,668 | 5 | 734 |
| Byron (Township) | Ogle County | 6,272 | 37 | 170 |
| Cabery | Ford County / Kankakee County | 246 | 0 | 0 |
| Cahokia | Macoupin County | 3,133 | 37 | 85 |
| Cahokia | St. Clair County | 13,880 | 10 | 1388 |
| Cairo | Alexander County | 2,082 | 7 | 297 |
| Caledonia | Boone County | 193 | 1 | 193 |
| Caledonia (Township) | Boone County | 7,378 | 24 | 307 |
| Calhoun | Richland County | 166 | 1 | 166 |
| Calumet | Cook County | 20,103 | 4 | 5026 |
| Calumet City | Cook County | 35,913 | 7 | 5130 |
| Calumet Park | Cook County | 7,602 | 1 | 7602 |
| Camargo | Douglas County | 447 | 1 | 447 |
| Camargo (Township) | Douglas County | 3,459 | 39 | 89 |
| Cambria | Williamson County | 1,463 | 1 | 1463 |
| Cambridge | Henry County | 2,078 | 2 | 1039 |
| Cambridge (Township) | Henry County | 2,429 | 37 | 66 |
| Camden (Township) | Schuyler County | 206 | 37 | 6 |
| Camp Point | Adams County | 1,093 | 1 | 1093 |
| Camp Point (Township) | Adams County | 1,575 | 38 | 41 |
| Campbell Hill | Jackson County | 310 | 0 | 0 |
| Campton | Kane County | 17,382 | 34 | 511 |
| Campton Hills | Kane County | 11,091 | 17 | 652 |
| Campus | Livingston County | 157 | 0 | 0 |
| Candlewick Lake | Boone County | 4,675 | 2 | 2338 |
| Canoe Creek | Rock Island County | 692 | 14 | 49 |
| Canteen | St. Clair County | 9,588 | 17 | 564 |
| Canton | Fulton County | 13,506 | 8 | 1688 |
| Canton (Township) | Fulton County | 14,448 | 35 | 413 |
| Cantrall | Sangamon County | 133 | 0 | 0 |
| Capital | Sangamon County | 114,061 | 60 | 1901 |
| Capron | Boone County | 1,362 | 1 | 1362 |
| Carbon Cliff | Rock Island County | 1,957 | 2 | 979 |
| Carbon Hill | Grundy County | 335 | 0 | 0 |
| Carbondale | Jackson County / Williamson County | 25,083 | 17 | 1475 |
| Carbondale (Township) | Jackson County | 28,053 | 37 | 758 |
| Carlinville | Macoupin County | 5,481 | 3 | 1827 |
| Carlinville (Township) | Macoupin County | 6,187 | 35 | 177 |
| Carlock | McLean County | 557 | 0 | 0 |
| Carlyle | Clinton County | 3,186 | 3 | 1062 |
| Carlyle (Township) | Clinton County | 3,842 | 18 | 213 |
| Carman | Henderson County | 284 | 22 | 13 |
| Carmi | White County | 4,811 | 2 | 2406 |
| Carmi (Township) | White County | 6,230 | 36 | 173 |
| Carol Stream | DuPage County | 39,203 | 9 | 4356 |
| Carpentersville | Kane County | 37,254 | 8 | 4657 |
| Carrier Mills | Saline County | 1,552 | 1 | 1552 |
| Carrier Mills (Township) | Saline County | 2,191 | 37 | 59 |
| Carrigan | Marion County | 364 | 35 | 10 |
| Carroll | Vermilion County | 572 | 37 | 15 |
| Carrollton | Greene County | 2,398 | 2 | 1199 |
| Carrollton (Township) | Greene County | 2,845 | 44 | 65 |
| Carson | Fayette County | 136 | 18 | 8 |
| Carterville | Williamson County | 5,847 | 5 | 1169 |
| Carthage | Hancock County | 2,457 | 2 | 1229 |
| Carthage (Township) | Hancock County | 2,867 | 40 | 72 |
| Cartwright | Sangamon County | 1,450 | 72 | 20 |
| Cary | McHenry County | 18,067 | 6 | 3011 |
| Casey | Clark County / Cumberland County | 2,620 | 2 | 1310 |
| Casey (Township) | Clark County | 3,723 | 36 | 103 |
| Caseyville | St. Clair County | 4,110 | 7 | 587 |
| Caseyville (Township) | St. Clair County | 30,972 | 35 | 885 |
| Casner | Jefferson County | 1,208 | 36 | 34 |
| Cass | Fulton County | 595 | 39 | 15 |
| Catlin | Vermilion County | 1,926 | 1 | 1926 |
| Catlin (Township) | Vermilion County | 3,090 | 50 | 62 |
| Cave | Franklin County | 1,703 | 36 | 47 |
| Cave-In-Rock | Hardin County | 280 | 0 | 0 |
| Cazenovia | Woodford County | 1,709 | 36 | 47 |
| Cedar | Knox County | 3,056 | 36 | 85 |
| Cedar Point | LaSalle County | 256 | 1 | 256 |
| Cedarville | Stephenson County | 689 | 0 | 0 |
| Central | Bond County | 7,313 | 37 | 198 |
| Central City | Marion County | 1,115 | 1 | 1115 |
| Centralia | Clinton County / Jefferson County / Marion County / Washington County | 12,210 | 8 | 1526 |
| Centralia (Township) | Marion County | 14,115 | 35 | 403 |
| Centreville | St. Clair County | 4,897 | 4 | 1224 |
| Centreville (Township) | St. Clair County | 23,373 | 28 | 835 |
| Cerro Gordo | Piatt County | 1,347 | 1 | 1347 |
| Cerro Gordo (Township) | Piatt County | 1,953 | 60 | 33 |
| Chadwick | Carroll County | 516 | 0 | 0 |
| Chalmers | McDonough County | 632 | 27 | 23 |
| Chambersburg | Pike County | 190 | 29 | 7 |
| Champaign | Champaign County | 88,909 | 23 | 3866 |
| Champaign (Township) | Champaign County | 11,439 | 18 | 636 |
| Champaign City | Champaign County | 88,909 | 23 | 3866 |
| Chandlerville | Cass County | 494 | 1 | 494 |
| Chandlerville (Township) | Cass County | 459 | 25 | 18 |
| Channahon | Grundy County / Will County | 13,239 | 16 | 827 |
| Channahon (Township) | Will County | 10,818 | 33 | 328 |
| Channel Lake | Lake County | 1,465 | 2 | 733 |
| Chapin | Morgan County | 478 | 1 | 478 |
| Charleston | Coles County | 20,117 | 9 | 2235 |
| Charleston (Township) | Coles County | 22,090 | 37 | 597 |
| Charlotte | Livingston County | 127 | 30 | 4 |
| Chatham | Sangamon County | 13,008 | 7 | 1858 |
| Chatham (Township) | Sangamon County | 7,706 | 37 | 208 |
| Chatsworth | Livingston County | 1,115 | 3 | 372 |
| Chatsworth (Township) | Livingston County | 1,259 | 36 | 35 |
| Chebanse | Iroquois County / Kankakee County | 971 | 1 | 971 |
| Chebanse (Township) | Iroquois County | 2,831 | 64 | 44 |
| Chemung | McHenry County | 466 | 0 | 0 |
| Chemung (Township) | McHenry County | 8,778 | 33 | 266 |
| Cheney's Grove | McLean County | 970 | 36 | 27 |
| Chenoa | McLean County | 1,723 | 2 | 862 |
| Chenoa (Township) | McLean County | 2,009 | 36 | 56 |
| Cherry | Bureau County | 453 | 1 | 453 |
| Cherry Grove-Shannon | Carroll County | 1,388 | 54 | 26 |
| Cherry Valley | Boone County / Winnebago County | 2,877 | 8 | 360 |
| Cherry Valley (Township) | Winnebago County | 19,038 | 30 | 635 |
| Chester | Logan County | 641 | 38 | 17 |
| Chester | Randolph County | 8,213 | 6 | 1369 |
| Chesterfield | Macoupin County | 177 | 1 | 177 |
| Chesterfield (Township) | Macoupin County | 808 | 36 | 22 |
| Chestnut | Knox County | 243 | 36 | 7 |
| Chestnut | Logan County | 117 | 0 | 0 |
| Chicago | Cook County / DuPage County | 2,693,976 | 227 | 11868 |
| Chicago Heights | Cook County | 29,322 | 10 | 2932 |
| Chicago Ridge | Cook County | 13,928 | 2 | 6964 |
| Chili | Hancock County | 609 | 38 | 16 |
| Chillicothe | Peoria County | 6,012 | 5 | 1202 |
| Chillicothe (Township) | Peoria County | 8,193 | 18 | 455 |
| Chouteau | Madison County | 7,970 | 30 | 266 |
| Chrisman | Edgar County | 1,265 | 1 | 1265 |
| Christopher | Franklin County | 2,717 | 2 | 1359 |
| Christy | Lawrence County | 3,511 | 34 | 103 |
| Cicero | Cook County | 80,796 | 6 | 13466 |
| Cicero (Township) | Cook County | 80,796 | 6 | 13466 |
| Cincinnati | Tazewell County | 8,891 | 28 | 318 |
| Cisco | Piatt County | 242 | 0 | 0 |
| Cisne | Wayne County | 660 | 1 | 660 |
| Cissna Park | Iroquois County | 779 | 1 | 779 |
| Claremont | Richland County | 170 | 1 | 170 |
| Claremont (Township) | Richland County | 831 | 44 | 19 |
| Clarendon Hills | DuPage County | 8,752 | 2 | 4376 |
| Clarion | Bureau County | 394 | 35 | 11 |
| Clarksburg | Shelby County | 392 | 27 | 15 |
| Clay City | Clay County | 911 | 2 | 456 |
| Clay City (Township) | Clay County | 1,218 | 40 | 30 |
| Clayton | Adams County | 673 | 1 | 673 |
| Clayton | Woodford County | 673 | 36 | 19 |
| Clayton (Township) | Adams County | 982 | 37 | 27 |
| Clear Lake | Sangamon County | 220 | 0 | 0 |
| Clear Lake (Township) | Sangamon County | 8,371 | 34 | 246 |
| Clement | Clinton County | 477 | 19 | 25 |
| Cleveland | Henry County | 182 | 0 | 0 |
| Clifton | Iroquois County | 1,321 | 1 | 1321 |
| Clinton | DeKalb County | 1,856 | 35 | 53 |
| Clinton | De Witt County | 6,857 | 4 | 1714 |
| Clintonia | De Witt County | 7,290 | 30 | 243 |
| Clover | Henry County | 900 | 35 | 26 |
| Clyde | Whiteside County | 382 | 36 | 11 |
| Coal City | Grundy County / Will County | 5,409 | 6 | 902 |
| Coal Valley | Henry County / Rock Island County | 3,723 | 3 | 1241 |
| Coal Valley (Township) | Rock Island County | 4,370 | 12 | 364 |
| Coalton | Montgomery County | 286 | 1 | 286 |
| Coatsburg | Adams County | 142 | 0 | 0 |
| Cobden | Union County | 1,064 | 1 | 1064 |
| Coe | Rock Island County | 1,618 | 36 | 45 |
| Coffeen | Montgomery County | 644 | 1 | 644 |
| Colchester | McDonough County | 1,288 | 1 | 1288 |
| Colchester (Township) | McDonough County | 1,707 | 18 | 95 |
| Cold Spring | Shelby County | 438 | 35 | 13 |
| Coldbrook | Warren County | 452 | 36 | 13 |
| Coleta | Whiteside County | 152 | 0 | 0 |
| Colfax | Champaign County | 259 | 36 | 7 |
| Colfax | McLean County | 1,013 | 1 | 1013 |
| Collinsville | Madison County / St. Clair County | 24,395 | 15 | 1626 |
| Collinsville (Township) | Madison County | 35,603 | 35 | 1017 |
| Coloma | Whiteside County | 10,607 | 10 | 1061 |
| Colona | Henry County | 5,120 | 4 | 1280 |
| Colona (Township) | Henry County | 6,737 | 29 | 232 |
| Colp | Williamson County | 210 | 0 | 0 |
| Columbia | Monroe County / St. Clair County | 10,513 | 10 | 1051 |
| Columbus (Township) | Adams County | 528 | 37 | 14 |
| Como | Whiteside County | 538 | 1 | 538 |
| Compromise | Champaign County | 1,500 | 48 | 31 |
| Compton | Lee County | 283 | 0 | 0 |
| Concord | Adams County | 281 | 37 | 8 |
| Concord | Bureau County | 1,536 | 36 | 43 |
| Concord | Iroquois County | 426 | 40 | 11 |
| Concord | Morgan County | 154 | 0 | 0 |
| Condit | Champaign County | 493 | 36 | 14 |
| Congerville | Woodford County | 492 | 1 | 492 |
| Cooksville | McLean County | 179 | 0 | 0 |
| Cooper | Sangamon County | 868 | 29 | 30 |
| Cooperstown | Brown County | 297 | 41 | 7 |
| Copley | Knox County | 329 | 35 | 9 |
| Coral | McHenry County | 3,459 | 36 | 96 |
| Cordova | Rock Island County | 645 | 1 | 645 |
| Cordova (Township) | Rock Island County | 857 | 25 | 34 |
| Cornell | Livingston County | 455 | 1 | 455 |
| Cornwall | Henry County | 269 | 36 | 7 |
| Cortland | DeKalb County | 4,408 | 4 | 1102 |
| Cortland (Township) | DeKalb County | 11,402 | 35 | 326 |
| Corwin | Logan County | 610 | 34 | 18 |
| Cottage | Saline County | 204 | 31 | 7 |
| Cotton Hill | Sangamon County | 879 | 30 | 29 |
| Cottonwood | Cumberland County | 508 | 33 | 15 |
| Coulterville | Randolph County | 895 | 1 | 895 |
| Council Hill | Jo Daviess County | 134 | 16 | 8 |
| Country Club Hills | Cook County | 16,482 | 5 | 3296 |
| Countryside | Cook County | 5,933 | 3 | 1978 |
| Covington | Washington County | 395 | 40 | 10 |
| Cowden | Shelby County | 579 | 0 | 0 |
| Coyne Center | Rock Island County | 951 | 2 | 476 |
| Crab Orchard | Williamson County | 273 | 1 | 273 |
| Crainville | Williamson County | 1,400 | 2 | 700 |
| Crane Creek | Mason County | 124 | 34 | 4 |
| Creal Springs | Williamson County | 527 | 1 | 527 |
| Creek | De Witt County | 453 | 35 | 13 |
| Crescent | Iroquois County | 538 | 36 | 15 |
| Crescent City | Iroquois County | 556 | 0 | 0 |
| Crest Hill | Will County | 20,376 | 9 | 2264 |
| Creston | Ogle County | 647 | 1 | 647 |
| Crestwood | Cook County | 10,706 | 3 | 3569 |
| Crete | Cook County / Will County | 8,023 | 9 | 891 |
| Crete (Township) | Will County | 23,154 | 44 | 526 |
| Creve Coeur | Tazewell County | 5,169 | 4 | 1292 |
| Crittenden | Champaign County | 316 | 36 | 9 |
| Crook | Hamilton County | 302 | 36 | 8 |
| Crooked Creek | Cumberland County | 409 | 34 | 12 |
| Crooked Creek | Jasper County | 716 | 56 | 13 |
| Cropsey | McLean County | 220 | 18 | 12 |
| Crossville | White County | 689 | 1 | 689 |
| Crouch | Hamilton County | 358 | 47 | 8 |
| Cruger | Woodford County | 1,684 | 17 | 99 |
| Crystal Lake | McHenry County | 39,829 | 19 | 2096 |
| Crystal Lawns | Will County | 2,170 | 1 | 2170 |
| Cuba | Fulton County | 1,170 | 1 | 1170 |
| Cuba | Lake County | 16,473 | 23 | 716 |
| Cullom | Livingston County | 522 | 0 | 0 |
| Cunningham | Champaign County | 42,214 | 12 | 3518 |
| Curran | Sangamon County | 207 | 2 | 104 |
| Curran (Township) | Sangamon County | 1,544 | 28 | 55 |
| Custer | Will County | 1,405 | 26 | 54 |
| Cutler | Perry County | 413 | 0 | 0 |
| Cypress | Johnson County | 235 | 1 | 235 |
| Dahlgren | Hamilton County | 502 | 1 | 502 |
| Dahlgren (Township) | Hamilton County | 1,163 | 54 | 22 |
| Dakota | Stephenson County | 468 | 0 | 0 |
| Dakota (Township) | Stephenson County | 757 | 18 | 42 |
| Dale | McLean County | 1,207 | 35 | 34 |
| Dallas City | Hancock County / Henderson County | 872 | 2 | 436 |
| Dallas City (Township) | Hancock County | 921 | 15 | 61 |
| Dalton City | Moultrie County | 501 | 1 | 501 |
| Dalzell | Bureau County / LaSalle County | 659 | 1 | 659 |
| Damiansville | Clinton County | 489 | 1 | 489 |
| Dana | LaSalle County | 150 | 0 | 0 |
| Danforth | Iroquois County | 552 | 0 | 0 |
| Danforth (Township) | Iroquois County | 850 | 52 | 16 |
| Danvers | McLean County | 1,100 | 1 | 1100 |
| Danvers (Township) | McLean County | 1,863 | 45 | 41 |
| Danville | Vermilion County | 30,479 | 18 | 1693 |
| Danville (Township) | Vermilion County | 29,909 | 49 | 610 |
| Darien | DuPage County | 21,628 | 6 | 3605 |
| Darwin | Clark County | 325 | 27 | 12 |
| Davis | Stephenson County | 627 | 0 | 0 |
| Davis Junction | Ogle County | 2,344 | 4 | 586 |
| Dawson | McLean County | 593 | 37 | 16 |
| Dawson | Sangamon County | 482 | 1 | 482 |
| Dayton | LaSalle County | 464 | 2 | 232 |
| Dayton (Township) | LaSalle County | 2,299 | 21 | 109 |
| De Land | Piatt County | 425 | 0 | 0 |
| De Pue | Bureau County | 1,683 | 3 | 561 |
| De Soto | Jackson County | 1,502 | 1 | 1502 |
| De Soto (Township) | Jackson County | 2,252 | 36 | 63 |
| De Witt | De Witt County | 176 | 0 | 0 |
| De Witt (Township) | De Witt County | 458 | 32 | 14 |
| Decatur | Macon County | 70,746 | 42 | 1684 |
| Decatur (Township) | Macon County | 49,097 | 29 | 1693 |
| Decker | Richland County | 385 | 35 | 11 |
| Deer Creek | Tazewell County / Woodford County | 663 | 1 | 663 |
| Deer Creek (Township) | Tazewell County | 1,349 | 27 | 50 |
| Deer Park | Cook County / Lake County | 4,225 | 4 | 1056 |
| Deer Park | LaSalle County | 473 | 31 | 15 |
| Deerfield | Cook County / Lake County | 18,646 | 6 | 3108 |
| Deerfield | Fulton County | 248 | 34 | 7 |
| Degognia | Jackson County | 143 | 30 | 5 |
| DeKalb | DeKalb County | 42,847 | 16 | 2678 |
| DeKalb (Township) | DeKalb County | 45,611 | 35 | 1303 |
| Delavan | Tazewell County | 1,616 | 1 | 1616 |
| Delavan (Township) | Tazewell County | 1,952 | 30 | 65 |
| Dement | Ogle County | 953 | 35 | 27 |
| Denison | Lawrence County | 1,393 | 58 | 24 |
| Denning | Franklin County | 4,980 | 36 | 138 |
| Denver | Richland County | 387 | 35 | 11 |
| Derinda | Jo Daviess County | 303 | 37 | 8 |
| Derry | Pike County | 236 | 37 | 6 |
| Des Plaines | Cook County | 58,899 | 14 | 4207 |
| Detroit (Township) | Pike County | 301 | 26 | 12 |
| Diamond | Grundy County / Will County | 2,506 | 2 | 1253 |
| Dieterich | Effingham County | 595 | 1 | 595 |
| Dillon | Tazewell County | 965 | 36 | 27 |
| Dimmick | LaSalle County | 705 | 37 | 19 |
| Divernon | Sangamon County | 1,105 | 1 | 1105 |
| Divernon (Township) | Sangamon County | 1,430 | 27 | 53 |
| Dix | Ford County | 583 | 54 | 11 |
| Dix | Jefferson County | 440 | 2 | 220 |
| Dixmoor | Cook County | 3,563 | 1 | 3563 |
| Dixon | Lee County | 15,115 | 8 | 1889 |
| Dixon (Township) | Lee County | 17,196 | 29 | 593 |
| Dodds | Jefferson County | 2,582 | 37 | 70 |
| Dolson | Clark County | 333 | 35 | 10 |
| Dolton | Cook County | 22,348 | 5 | 4470 |
| Dongola | Union County | 678 | 1 | 678 |
| Donnellson | Bond County / Montgomery County | 195 | 0 | 0 |
| Donovan | Iroquois County | 274 | 0 | 0 |
| Dora | Moultrie County | 759 | 35 | 22 |
| Dorchester | Macoupin County | 138 | 1 | 138 |
| Dorchester (Township) | Macoupin County | 1,458 | 36 | 41 |
| Dorr | McHenry County | 21,131 | 36 | 587 |
| Douglas | Clark County | 158 | 18 | 9 |
| Douglas | Effingham County | 12,720 | 34 | 374 |
| Douglas | Iroquois County | 1,917 | 45 | 43 |
| Dover | Bureau County | 153 | 0 | 0 |
| Dover (Township) | Bureau County | 510 | 37 | 14 |
| Dowell | Jackson County | 386 | 0 | 0 |
| Downers Grove | DuPage County | 49,057 | 15 | 3270 |
| Downers Grove (Township) | DuPage County | 147,324 | 50 | 2946 |
| Downs | McLean County | 951 | 3 | 317 |
| Downs (Township) | McLean County | 1,210 | 49 | 25 |
| Drummer | Ford County | 3,794 | 53 | 72 |
| Drury | Rock Island County | 771 | 49 | 16 |
| Dry Grove | McLean County | 1,564 | 35 | 45 |
| Dry Point | Shelby County | 1,053 | 24 | 44 |
| Du Bois | Washington County | 189 | 1 | 189 |
| Du Bois (Township) | Washington County | 710 | 37 | 19 |
| Du Page | Will County | 88,704 | 36 | 2464 |
| Du Quoin | Perry County | 5,670 | 7 | 810 |
| Duncan | Mercer County | 253 | 37 | 7 |
| Dundee | Kane County | 65,260 | 35 | 1865 |
| Dunfermline | Fulton County | 283 | 0 | 0 |
| Dunham | McHenry County | 2,737 | 36 | 76 |
| Dunlap | Peoria County | 1,448 | 2 | 724 |
| Dunleith | Jo Daviess County | 3,600 | 10 | 360 |
| Dupo | Monroe County / St. Clair County | 3,877 | 6 | 646 |
| Durand | Winnebago County | 1,394 | 1 | 1394 |
| Durand (Township) | Winnebago County | 2,297 | 30 | 77 |
| Durham | Hancock County | 257 | 37 | 7 |
| Dwight | Grundy County / Livingston County | 3,984 | 3 | 1328 |
| Dwight (Township) | Livingston County | 4,201 | 35 | 120 |
| Eagarville | Macoupin County | 120 | 1 | 120 |
| Eagle | LaSalle County | 1,595 | 31 | 51 |
| Eagle Creek | Gallatin County | 163 | 37 | 4 |
| Eagle Point | Ogle County | 215 | 20 | 11 |
| Earl | LaSalle County | 2,444 | 37 | 66 |
| Earlville | LaSalle County | 1,587 | 1 | 1587 |
| East Alton | Madison County | 5,954 | 5 | 1191 |
| East Bend | Champaign County | 571 | 36 | 16 |
| East Brooklyn | Grundy County | 105 | 0 | 0 |
| East Cape Girardeau | Alexander County | 286 | 2 | 143 |
| East Carondelet | St. Clair County | 473 | 1 | 473 |
| East Dubuque | Jo Daviess County | 1,569 | 3 | 523 |
| East Dundee | Cook County / Kane County | 3,216 | 3 | 1072 |
| East Eldorado | Saline County | 5,575 | 36 | 155 |
| East Fork | Clinton County | 411 | 32 | 13 |
| East Fork | Montgomery County | 2,491 | 58 | 43 |
| East Galena | Jo Daviess County | 1,214 | 23 | 53 |
| East Galesburg | Knox County | 774 | 1 | 774 |
| East Gillespie | Macoupin County | 262 | 0 | 0 |
| East Grove | Lee County | 241 | 36 | 7 |
| East Hazel Crest | Cook County | 1,497 | 1 | 1497 |
| East Lincoln | Logan County | 8,138 | 36 | 226 |
| East Moline | Rock Island County | 20,645 | 15 | 1376 |
| East Nelson | Moultrie County | 1,047 | 36 | 29 |
| East Oakland | Coles County | 1,344 | 39 | 34 |
| East Peoria | Tazewell County | 22,546 | 20 | 1127 |
| East St. Louis | St. Clair County | 26,047 | 14 | 1861 |
| East St. Louis (Township) | St. Clair County | 26,047 | 14 | 1861 |
| Eastern | Franklin County | 564 | 36 | 16 |
| Easton | Mason County | 287 | 0 | 0 |
| Eden | LaSalle County | 1,376 | 36 | 38 |
| Edford | Henry County | 648 | 27 | 24 |
| Edgar | Edgar County | 446 | 55 | 8 |
| Edgewood | Effingham County | 430 | 1 | 430 |
| Edgington | Rock Island County | 1,441 | 36 | 40 |
| Edinburg | Christian County | 1,012 | 1 | 1012 |
| Edwardsville | Madison County | 25,233 | 20 | 1262 |
| Edwardsville (Township) | Madison County | 38,316 | 35 | 1095 |
| Effingham | Effingham County | 12,511 | 10 | 1251 |
| El Paso | McLean County / Woodford County | 2,730 | 2 | 1365 |
| El Paso (Township) | Woodford County | 3,394 | 24 | 141 |
| Ela | Lake County | 44,634 | 34 | 1313 |
| Elba | Knox County | 274 | 36 | 8 |
| Elbridge | Edgar County | 767 | 43 | 18 |
| Elburn | Kane County | 5,997 | 3 | 1999 |
| Eldorado | McDonough County | 122 | 36 | 3 |
| Eldorado | Saline County | 3,910 | 3 | 1303 |
| Eldred | Greene County | 186 | 0 | 0 |
| Elgin | Cook County / Kane County | 110,849 | 38 | 2917 |
| Elgin (Township) | Kane County | 104,752 | 32 | 3274 |
| Eliza | Mercer County | 390 | 57 | 7 |
| Elizabeth | Jo Daviess County | 722 | 1 | 722 |
| Elizabeth (Township) | Jo Daviess County | 1,047 | 37 | 28 |
| Elizabethtown | Hardin County | 273 | 1 | 273 |
| Elk | Jackson County | 1,786 | 36 | 50 |
| Elk Grove | Cook County | 91,251 | 28 | 3259 |
| Elk Grove Village | Cook County / DuPage County | 32,400 | 12 | 2700 |
| Elk Prairie | Jefferson County | 703 | 27 | 26 |
| Elkhart | Logan County | 390 | 2 | 195 |
| Elkhart (Township) | Logan County | 489 | 52 | 9 |
| Elkhorn | Brown County | 330 | 37 | 9 |
| Elkhorn Grove | Carroll County | 217 | 20 | 11 |
| Elkville | Jackson County | 863 | 1 | 863 |
| Ellington | Adams County | 2,757 | 34 | 81 |
| Elliott | Ford County | 269 | 0 | 0 |
| Ellis Grove | Randolph County | 348 | 0 | 0 |
| Ellison | Warren County | 326 | 36 | 9 |
| Ellisville (Township) | Fulton County | 147 | 14 | 11 |
| Ellsworth | McLean County | 198 | 0 | 0 |
| Elm Grove | Tazewell County | 2,963 | 36 | 82 |
| Elm River | Wayne County | 264 | 36 | 7 |
| Elmhurst | Cook County / DuPage County | 46,746 | 10 | 4675 |
| Elmira | Stark County | 282 | 35 | 8 |
| Elmwood | Peoria County | 2,011 | 1 | 2011 |
| Elmwood (Township) | Peoria County | 2,493 | 36 | 69 |
| Elmwood Park | Cook County | 24,098 | 2 | 12049 |
| Elsah | Jersey County | 606 | 1 | 606 |
| Elsah (Township) | Jersey County | 2,268 | 24 | 95 |
| Elvaston | Hancock County | 154 | 1 | 154 |
| Elwood | Vermilion County | 1,528 | 25 | 61 |
| Elwood | Will County | 2,226 | 14 | 159 |
| Embarrass | Edgar County | 568 | 44 | 13 |
| Emden | Logan County | 460 | 0 | 0 |
| Eminence | Logan County | 402 | 43 | 9 |
| Emington | Livingston County | 108 | 0 | 0 |
| Emma | White County | 359 | 63 | 6 |
| Emmet | McDonough County | 1,201 | 32 | 38 |
| Empire | McLean County | 4,032 | 49 | 82 |
| Energy | Williamson County | 1,109 | 1 | 1109 |
| Enfield | White County | 552 | 1 | 552 |
| Enfield (Township) | White County | 837 | 35 | 24 |
| Engelmann | St. Clair County | 673 | 30 | 22 |
| English | Jersey County | 454 | 37 | 12 |
| Eppards Point | Livingston County | 405 | 36 | 11 |
| Equality | Gallatin County | 518 | 1 | 518 |
| Equality (Township) | Gallatin County | 736 | 37 | 20 |
| Erie | Whiteside County | 1,499 | 1 | 1499 |
| Erie (Township) | Whiteside County | 1,883 | 24 | 78 |
| Erienna | Grundy County | 2,513 | 21 | 120 |
| Erin | Stephenson County | 385 | 18 | 21 |
| Esmen | Livingston County | 305 | 36 | 8 |
| Essex | Kankakee County | 758 | 2 | 379 |
| Essex | Stark County | 556 | 36 | 15 |
| Essex (Township) | Kankakee County | 1,414 | 36 | 39 |
| Eureka | Woodford County | 5,283 | 3 | 1761 |
| Evans | Marshall County | 1,179 | 37 | 32 |
| Evanston | Cook County | 73,473 | 8 | 9184 |
| Evansville | Randolph County | 647 | 1 | 647 |
| Evergreen Park | Cook County | 19,147 | 3 | 6382 |
| Ewing | Franklin County | 296 | 1 | 296 |
| Ewing (Township) | Franklin County | 1,293 | 36 | 36 |
| Fairbury | Livingston County | 3,622 | 2 | 1811 |
| Fairfield | Bureau County | 351 | 36 | 10 |
| Fairfield | Wayne County | 4,936 | 4 | 1234 |
| Fairhaven | Carroll County | 858 | 38 | 23 |
| Fairmont | Will County | 2,595 | 1 | 2595 |
| Fairmont City | Madison County / St. Clair County | 2,453 | 6 | 409 |
| Fairmount | Pike County | 183 | 38 | 5 |
| Fairmount | Vermilion County | 596 | 0 | 0 |
| Fairview | Fulton County | 471 | 4 | 118 |
| Fairview (Township) | Fulton County | 639 | 36 | 18 |
| Fairview Heights | St. Clair County | 16,303 | 11 | 1482 |
| Fall Creek | Adams County | 512 | 36 | 14 |
| Fall River | LaSalle County | 725 | 20 | 36 |
| Fancy Creek | Sangamon County | 5,800 | 47 | 123 |
| Farina | Fayette County / Marion County | 499 | 1 | 499 |
| Farm Ridge | LaSalle County | 868 | 35 | 25 |
| Farmer City | De Witt County | 1,936 | 2 | 968 |
| Farmers | Fulton County | 369 | 36 | 10 |
| Farmersville | Montgomery County | 671 | 1 | 671 |
| Farmington | Fulton County / Peoria County | 2,223 | 2 | 1112 |
| Farmington (Township) | Fulton County | 3,095 | 36 | 86 |
| Farrington | Jefferson County | 556 | 37 | 15 |
| Fayette | Livingston County | 253 | 23 | 11 |
| Fayetteville | St. Clair County | 339 | 0 | 0 |
| Fayetteville (Township) | St. Clair County | 1,582 | 43 | 37 |
| Felix | Grundy County | 4,289 | 11 | 390 |
| Fenton | Whiteside County | 512 | 35 | 15 |
| Ferris | Hancock County | 143 | 2 | 72 |
| Fidelity | Jersey County | 112 | 0 | 0 |
| Fidelity (Township) | Jersey County | 681 | 36 | 19 |
| Field | Jefferson County | 1,440 | 37 | 39 |
| Fieldon | Jersey County | 218 | 0 | 0 |
| Fillmore | Montgomery County | 310 | 1 | 310 |
| Fillmore Consolidated | Montgomery County | 807 | 60 | 13 |
| Findlay | Shelby County | 638 | 1 | 638 |
| Fisher | Champaign County | 1,937 | 1 | 1937 |
| Fithian | Vermilion County | 449 | 0 | 0 |
| Flagg | Ogle County | 12,839 | 36 | 357 |
| Flanagan | Livingston County | 1,064 | 1 | 1064 |
| Flannigan | Hamilton County | 290 | 36 | 8 |
| Flat Branch | Shelby County | 432 | 34 | 13 |
| Flat Rock | Crawford County | 307 | 1 | 307 |
| Flora | Boone County | 2,959 | 36 | 82 |
| Flora | Clay County | 4,852 | 5 | 970 |
| Florence | Stephenson County | 1,215 | 34 | 36 |
| Florence | Will County | 916 | 36 | 25 |
| Flossmoor | Cook County | 9,155 | 4 | 2289 |
| Floyd | Warren County | 458 | 36 | 13 |
| Fondulac | Tazewell County | 12,849 | 18 | 714 |
| Ford Heights | Cook County | 2,682 | 2 | 1341 |
| Forest City | Mason County | 225 | 1 | 225 |
| Forest City (Township) | Mason County | 477 | 33 | 14 |
| Forest Lake | Lake County | 1,688 | 0 | 0 |
| Forest Park | Cook County | 13,704 | 2 | 6852 |
| Forest View | Cook County | 666 | 1 | 666 |
| Forrest | Livingston County | 1,135 | 1 | 1135 |
| Forrest (Township) | Livingston County | 1,499 | 36 | 42 |
| Forreston | Ogle County | 1,341 | 1 | 1341 |
| Forreston (Township) | Ogle County | 1,943 | 36 | 54 |
| Forsyth | Macon County | 3,479 | 3 | 1160 |
| Fort Russell | Madison County | 8,962 | 37 | 242 |
| Foster | Madison County | 3,920 | 31 | 126 |
| Foster | Marion County | 355 | 36 | 10 |
| Fountain Bluff | Jackson County | 195 | 30 | 7 |
| Fountain Creek | Iroquois County | 336 | 36 | 9 |
| Fountain Green | Hancock County | 268 | 38 | 7 |
| Four Mile | Wayne County | 648 | 40 | 16 |
| Fox | Jasper County | 512 | 41 | 12 |
| Fox | Kendall County | 1,796 | 36 | 50 |
| Fox Lake | Lake County / McHenry County | 10,451 | 8 | 1306 |
| Fox Lake Hills | Lake County | 2,264 | 1 | 2264 |
| Fox River Grove | Lake County / McHenry County | 4,573 | 2 | 2287 |
| Frankfort | Cook County / Will County | 19,373 | 16 | 1211 |
| Frankfort | Franklin County | 6,721 | 36 | 187 |
| Frankfort (Township) | Will County | 59,641 | 37 | 1612 |
| Frankfort Square | Will County | 9,205 | 3 | 3068 |
| Franklin | DeKalb County | 2,486 | 36 | 69 |
| Franklin | Morgan County | 598 | 1 | 598 |
| Franklin Grove | Lee County | 938 | 0 | 0 |
| Franklin Grove (Township) | Lee County | 1,316 | 27 | 49 |
| Franklin Park | Cook County | 17,627 | 5 | 3525 |
| Frederick | Schuyler County | 158 | 14 | 11 |
| Freeburg | St. Clair County | 4,242 | 7 | 606 |
| Freeburg (Township) | St. Clair County | 4,891 | 34 | 144 |
| Freedom | Carroll County | 661 | 36 | 18 |
| Freedom | LaSalle County | 631 | 37 | 17 |
| Freeman Spur | Franklin County / Williamson County | 279 | 0 | 0 |
| Freeport | Stephenson County | 23,775 | 12 | 1981 |
| Freeport (Township) | Stephenson County | 23,775 | 12 | 1981 |
| Fremont | Lake County | 32,486 | 34 | 955 |
| Friends Creek | Macon County | 1,361 | 49 | 28 |
| Fulton | Whiteside County | 3,315 | 2 | 1658 |
| Fulton (Township) | Whiteside County | 4,051 | 17 | 238 |
| Funks Grove | McLean County | 242 | 48 | 5 |
| Gages Lake | Lake County | 10,042 | 3 | 3347 |
| Galatia | Saline County | 880 | 2 | 440 |
| Galatia (Township) | Saline County | 1,165 | 19 | 61 |
| Galena | Jo Daviess County | 3,158 | 4 | 790 |
| Galesburg | Knox County | 30,197 | 18 | 1678 |
| Galesburg (Township) | Knox County | 343 | 21 | 16 |
| Galesburg City | Knox County | 30,197 | 18 | 1678 |
| Galva | Henry County | 2,478 | 3 | 826 |
| Galva (Township) | Henry County | 2,720 | 34 | 80 |
| Ganeer | Kankakee County | 3,018 | 40 | 75 |
| Garden Hill | Wayne County | 139 | 19 | 7 |
| Garden Plain | Whiteside County | 1,021 | 31 | 33 |
| Garden Prairie | Boone County | 221 | 1 | 221 |
| Gardner | Grundy County | 1,381 | 3 | 460 |
| Gardner | Sangamon County | 4,145 | 43 | 96 |
| Garfield | Grundy County | 1,501 | 18 | 83 |
| Garrett | Douglas County | 158 | 0 | 0 |
| Garrett (Township) | Douglas County | 1,401 | 52 | 27 |
| Gays | Moultrie County | 254 | 0 | 0 |
| Genesee | Whiteside County | 742 | 35 | 21 |
| Geneseo | Henry County | 6,495 | 5 | 1299 |
| Geneseo (Township) | Henry County | 7,327 | 36 | 204 |
| Geneva | Kane County | 21,809 | 10 | 2181 |
| Geneva (Township) | Kane County | 26,883 | 16 | 1680 |
| Genoa | DeKalb County | 5,237 | 3 | 1746 |
| Genoa (Township) | DeKalb County | 5,732 | 36 | 159 |
| Georgetown | McDonough County | 546 | 0 | 0 |
| Georgetown | Vermilion County | 3,185 | 2 | 1593 |
| Georgetown (Township) | Vermilion County | 7,281 | 26 | 280 |
| German | Richland County | 328 | 38 | 9 |
| German Valley | Stephenson County | 425 | 0 | 0 |
| Germantown | Clinton County | 1,274 | 1 | 1274 |
| Germantown (Township) | Clinton County | 2,065 | 38 | 54 |
| Germantown Hills | Woodford County | 3,423 | 2 | 1712 |
| Gibson City | Ford County | 3,233 | 2 | 1617 |
| Gifford | Champaign County | 1,048 | 0 | 0 |
| Gilberts | Kane County | 8,076 | 6 | 1346 |
| Gillespie | Macoupin County | 3,088 | 1 | 3088 |
| Gillespie (Township) | Macoupin County | 3,630 | 36 | 101 |
| Gilman | Iroquois County | 1,652 | 2 | 826 |
| Gilmer | Adams County | 1,080 | 37 | 29 |
| Gilson | Knox County | 158 | 0 | 0 |
| Girard | Macoupin County | 2,000 | 1 | 2000 |
| Girard (Township) | Macoupin County | 2,340 | 18 | 130 |
| Gladstone | Henderson County | 264 | 0 | 0 |
| Gladstone (Township) | Henderson County | 883 | 47 | 19 |
| Glasford | Peoria County | 957 | 1 | 957 |
| Glasgow | Scott County | 132 | 1 | 132 |
| Glen Carbon | Madison County | 12,850 | 10 | 1285 |
| Glen Ellyn | DuPage County | 27,714 | 7 | 3959 |
| Glencoe | Cook County | 8,826 | 4 | 2207 |
| Glendale Heights | DuPage County | 33,617 | 5 | 6723 |
| Glenview | Cook County | 47,308 | 14 | 3379 |
| Glenwood | Cook County | 8,715 | 3 | 2905 |
| Godfrey | Madison County | 17,400 | 34 | 512 |
| Godfrey (Township) | Madison County | 17,400 | 34 | 512 |
| Godley | Grundy County / Will County | 756 | 1 | 756 |
| Golconda | Pope County | 631 | 0 | 0 |
| Gold | Bureau County | 162 | 36 | 5 |
| Gold Hill | Gallatin County | 1,472 | 35 | 42 |
| Golden | Adams County | 617 | 1 | 617 |
| Golf | Cook County | 493 | 0 | 0 |
| Good Hope | McDonough County | 364 | 0 | 0 |
| Goode | Franklin County | 2,622 | 28 | 94 |
| Goodfarm | Grundy County | 365 | 36 | 10 |
| Goodfield | Tazewell County / Woodford County | 986 | 2 | 493 |
| Goofy Ridge | Mason County | 165 | 1 | 165 |
| Goose Creek | Piatt County | 764 | 56 | 14 |
| Goose Lake | Grundy County | 1,629 | 25 | 65 |
| Goreville | Johnson County | 1,060 | 3 | 353 |
| Gorham | Jackson County | 219 | 1 | 219 |
| Goshen | Stark County | 611 | 37 | 17 |
| Grafton | Jersey County | 640 | 4 | 160 |
| Grafton | McHenry County | 55,731 | 36 | 1548 |
| Grand Detour | Ogle County | 507 | 1 | 507 |
| Grand Detour (Township) | Ogle County | 657 | 11 | 60 |
| Grand Prairie | Jefferson County | 891 | 36 | 25 |
| Grand Rapids | LaSalle County | 319 | 36 | 9 |
| Grand Ridge | LaSalle County | 525 | 0 | 0 |
| Grand Tower | Jackson County | 564 | 1 | 564 |
| Grand Tower (Township) | Jackson County | 659 | 32 | 21 |
| Grandview | Edgar County | 541 | 45 | 12 |
| Grandview | Sangamon County | 1,383 | 0 | 0 |
| Grandville | Jasper County | 369 | 37 | 10 |
| Grandwood Park | Lake County | 5,335 | 2 | 2668 |
| Granite City | Madison County | 28,158 | 19 | 1482 |
| Granite City (Township) | Madison County | 25,643 | 11 | 2331 |
| Grant | Lake County | 26,529 | 18 | 1474 |
| Grant | Vermilion County | 5,622 | 87 | 65 |
| Grant Park | Kankakee County | 1,249 | 3 | 416 |
| Grantfork | Madison County | 343 | 0 | 0 |
| Granville | Putnam County | 1,308 | 1 | 1308 |
| Granville (Township) | Putnam County | 2,775 | 45 | 62 |
| Gray | White County | 1,056 | 27 | 39 |
| Grayslake | Lake County | 20,725 | 11 | 1884 |
| Grayville | Edwards County / White County | 1,565 | 2 | 783 |
| Green Garden | Will County | 3,959 | 37 | 107 |
| Green Oaks | Lake County | 3,897 | 4 | 974 |
| Green Valley | Tazewell County | 643 | 0 | 0 |
| Greenbush | Warren County | 512 | 36 | 14 |
| Greene | Mercer County | 1,531 | 37 | 41 |
| Greene | Woodford County | 481 | 36 | 13 |
| Greenfield | Greene County | 988 | 2 | 494 |
| Greenfield | Grundy County | 943 | 17 | 55 |
| Greenup | Cumberland County | 1,490 | 2 | 745 |
| Greenup (Township) | Cumberland County | 2,350 | 47 | 50 |
| Greenview | Menard County | 724 | 1 | 724 |
| Greenville | Bond County | 6,417 | 6 | 1070 |
| Greenville | Bureau County | 342 | 36 | 10 |
| Greenwood | Christian County | 195 | 37 | 5 |
| Greenwood | McHenry County | 226 | 2 | 113 |
| Greenwood (Township) | McHenry County | 13,847 | 35 | 396 |
| Gridley | McLean County | 1,398 | 1 | 1398 |
| Gridley (Township) | McLean County | 1,873 | 54 | 35 |
| Griggsville | Pike County | 1,150 | 1 | 1150 |
| Griggsville (Township) | Pike County | 1,350 | 38 | 36 |
| Grisham | Montgomery County | 589 | 24 | 25 |
| Grove | Jasper County | 611 | 49 | 12 |
| Groveland | LaSalle County | 599 | 37 | 16 |
| Groveland | Tazewell County | 18,705 | 38 | 492 |
| Grover | Wayne County | 3,621 | 20 | 181 |
| Guilford | Jo Daviess County | 1,143 | 37 | 31 |
| Gurnee | Lake County | 30,378 | 14 | 2170 |
| Hadley | Pike County | 252 | 37 | 7 |
| Hagener | Cass County | 342 | 48 | 7 |
| Hahnaman | Whiteside County | 378 | 36 | 11 |
| Haines | Marion County | 958 | 36 | 27 |
| Hainesville | Lake County | 3,557 | 2 | 1779 |
| Hale | Warren County | 332 | 37 | 9 |
| Hall | Bureau County | 7,675 | 37 | 207 |
| Hallock | Peoria County | 1,541 | 36 | 43 |
| Hamburg | Calhoun County | 119 | 1 | 119 |
| Hamel | Madison County | 810 | 1 | 810 |
| Hamel (Township) | Madison County | 2,499 | 36 | 69 |
| Hamilton | Hancock County | 2,715 | 4 | 679 |
| Hamilton | Lee County | 191 | 36 | 5 |
| Hammond | Piatt County | 479 | 1 | 479 |
| Hampshire | Kane County | 6,251 | 9 | 695 |
| Hampshire (Township) | Kane County | 8,319 | 36 | 231 |
| Hampton | Rock Island County | 1,742 | 1 | 1742 |
| Hampton (Township) | Rock Island County | 21,128 | 34 | 621 |
| Hanaford | Franklin County | 322 | 1 | 322 |
| Hancock | Hancock County | 237 | 38 | 6 |
| Hanna | Henry County | 2,296 | 19 | 121 |
| Hanna City | Peoria County | 1,192 | 1 | 1192 |
| Hanover | Cook County | 98,887 | 33 | 2997 |
| Hanover | Jo Daviess County | 768 | 1 | 768 |
| Hanover (Township) | Jo Daviess County | 1,107 | 52 | 21 |
| Hanover Park | Cook County / DuPage County | 37,426 | 6 | 6238 |
| Hardin | Calhoun County | 900 | 2 | 450 |
| Hardin | Pike County | 203 | 37 | 5 |
| Harlem | Stephenson County | 2,160 | 32 | 68 |
| Harlem | Winnebago County | 38,913 | 33 | 1179 |
| Harmon | Lee County | 111 | 0 | 0 |
| Harmon (Township) | Lee County | 353 | 36 | 10 |
| Harmony | Hancock County | 302 | 38 | 8 |
| Harp | De Witt County | 297 | 31 | 10 |
| Harris | Fulton County | 352 | 34 | 10 |
| Harrisburg | Saline County | 8,513 | 7 | 1216 |
| Harrisburg (Township) | Saline County | 10,170 | 36 | 283 |
| Harrison | Jackson County | 862 | 2 | 431 |
| Harrison | Winnebago County | 642 | 25 | 26 |
| Harristown | Macon County | 1,292 | 2 | 646 |
| Harristown (Township) | Macon County | 1,815 | 28 | 65 |
| Harter | Clay County | 6,130 | 56 | 109 |
| Hartford | Madison County | 1,341 | 5 | 268 |
| Hartland | McHenry County | 1,984 | 36 | 55 |
| Hartsburg | Logan County | 307 | 0 | 0 |
| Harvard | McHenry County | 9,060 | 8 | 1133 |
| Harvel | Christian County / Montgomery County | 211 | 1 | 211 |
| Harvel (Township) | Montgomery County | 230 | 18 | 13 |
| Harvey | Cook County | 24,408 | 6 | 4068 |
| Harwood | Champaign County | 632 | 37 | 17 |
| Harwood Heights | Cook County | 8,333 | 1 | 8333 |
| Havana | Mason County | 2,987 | 3 | 996 |
| Havana (Township) | Mason County | 4,379 | 58 | 76 |
| Haw Creek | Knox County | 433 | 36 | 12 |
| Hawthorn Woods | Lake County | 8,666 | 8 | 1083 |
| Hawthorne | White County | 253 | 53 | 5 |
| Hazel Crest | Cook County | 13,565 | 3 | 4522 |
| Hebron | McHenry County | 1,183 | 2 | 592 |
| Hebron (Township) | McHenry County | 2,306 | 33 | 70 |
| Hecker | Monroe County / St. Clair County | 478 | 0 | 0 |
| Helvetia | Madison County | 8,551 | 36 | 238 |
| Henderson | Knox County | 244 | 0 | 0 |
| Henderson (Township) | Knox County | 1,083 | 34 | 32 |
| Hennepin | Putnam County | 705 | 5 | 141 |
| Hennepin (Township) | Putnam County | 1,200 | 41 | 29 |
| Henning | Vermilion County | 234 | 2 | 117 |
| Henry | Marshall County | 2,209 | 2 | 1105 |
| Henry (Township) | Marshall County | 2,430 | 15 | 162 |
| Hensley | Champaign County | 1,158 | 30 | 39 |
| Heralds Prairie | White County | 548 | 54 | 10 |
| Heritage Lake | Tazewell County | 1,478 | 1 | 1478 |
| Herrick | Shelby County | 431 | 0 | 0 |
| Herrick (Township) | Shelby County | 615 | 17 | 36 |
| Herrin | Williamson County | 12,687 | 10 | 1269 |
| Herscher | Kankakee County | 1,504 | 2 | 752 |
| Hettick | Macoupin County | 171 | 0 | 0 |
| Heyworth | McLean County | 2,867 | 3 | 956 |
| Hickory | Schuyler County | 136 | 18 | 8 |
| Hickory Hill | Wayne County | 402 | 43 | 9 |
| Hickory Hills | Cook County | 13,710 | 3 | 4570 |
| Hickory Point | Macon County | 17,553 | 36 | 488 |
| Hidalgo | Jasper County | 105 | 0 | 0 |
| Highland | Grundy County | 280 | 36 | 8 |
| Highland | Madison County | 9,834 | 7 | 1405 |
| Highland Park | Lake County | 29,515 | 12 | 2460 |
| Highwood | Lake County | 5,224 | 1 | 5224 |
| Hillcrest | Ogle County | 1,225 | 3 | 408 |
| Hillsboro | Montgomery County | 5,970 | 7 | 853 |
| Hillsboro (Township) | Montgomery County | 6,717 | 36 | 187 |
| Hillsdale | Rock Island County | 505 | 1 | 505 |
| Hillside | Cook County | 7,933 | 3 | 2644 |
| Hillview | Greene County | 177 | 1 | 177 |
| Hillyard | Macoupin County | 644 | 36 | 18 |
| Hinckley | DeKalb County | 2,050 | 1 | 2050 |
| Hindsboro | Douglas County | 296 | 0 | 0 |
| Hinsdale | Cook County / DuPage County | 17,637 | 5 | 3527 |
| Hire | McDonough County | 210 | 38 | 6 |
| Hittle | Tazewell County | 559 | 30 | 19 |
| Hodgkins | Cook County | 1,971 | 3 | 657 |
| Hoffman | Clinton County | 483 | 1 | 483 |
| Hoffman Estates | Cook County / Kane County | 50,932 | 21 | 2425 |
| Holiday Hills | McHenry County | 579 | 1 | 579 |
| Holiday Shores | Madison County | 2,810 | 2 | 1405 |
| Holland | Shelby County | 411 | 27 | 15 |
| Hollis | Peoria County | 1,818 | 24 | 76 |
| Homer | Champaign County | 1,159 | 1 | 1159 |
| Homer | Will County | 39,636 | 36 | 1101 |
| Homer Glen | Cook County / Will County | 24,472 | 22 | 1112 |
| Hometown | Cook County | 4,177 | 0 | 0 |
| Homewood | Cook County | 18,703 | 5 | 3741 |
| Honey Creek | Adams County | 698 | 37 | 19 |
| Honey Creek | Crawford County | 1,460 | 48 | 30 |
| Honey Point | Macoupin County | 146 | 37 | 4 |
| Hoopeston | Vermilion County | 5,009 | 4 | 1252 |
| Hooppole | Henry County | 191 | 0 | 0 |
| Hoosier | Clay County | 320 | 36 | 9 |
| Hope | LaSalle County | 655 | 36 | 18 |
| Hopedale | Tazewell County | 825 | 1 | 825 |
| Hopedale (Township) | Tazewell County | 1,829 | 35 | 52 |
| Hopewell | Marshall County | 398 | 1 | 398 |
| Hopewell (Township) | Marshall County | 516 | 34 | 15 |
| Hopkins | Whiteside County | 2,034 | 36 | 57 |
| Hopkins Park | Kankakee County | 598 | 4 | 150 |
| Houston | Adams County | 211 | 38 | 6 |
| Hoyleton | Washington County | 494 | 1 | 494 |
| Hoyleton (Township) | Washington County | 1,075 | 51 | 21 |
| Hudson | McLean County | 1,813 | 1 | 1813 |
| Hudson (Township) | McLean County | 2,532 | 36 | 70 |
| Huey | Clinton County | 163 | 0 | 0 |
| Hull | Pike County | 433 | 2 | 217 |
| Humboldt | Coles County | 418 | 0 | 0 |
| Humboldt (Township) | Coles County | 1,283 | 53 | 24 |
| Hume | Edgar County | 347 | 1 | 347 |
| Hume | Whiteside County | 395 | 29 | 14 |
| Hunt City | Jasper County | 284 | 32 | 9 |
| Hunter | Edgar County | 231 | 30 | 8 |
| Huntley | Kane County / McHenry County | 27,228 | 14 | 1945 |
| Huntsville | Schuyler County | 132 | 38 | 3 |
| Hurlbut | Logan County | 291 | 25 | 12 |
| Hurricane | Fayette County | 248 | 27 | 9 |
| Hurst | Williamson County | 786 | 1 | 786 |
| Hutsonville | Crawford County | 522 | 1 | 522 |
| Hutsonville (Township) | Crawford County | 1,115 | 37 | 30 |
| Hutton | Coles County | 879 | 55 | 16 |
| Illini | Macon County | 1,371 | 37 | 37 |
| Illiopolis | Sangamon County | 842 | 0 | 0 |
| Illiopolis (Township) | Sangamon County | 1,250 | 34 | 37 |
| Ina | Jefferson County | 2,279 | 2 | 1140 |
| Independence | Saline County | 1,053 | 37 | 28 |
| Indian Creek | Lake County | 535 | 0 | 0 |
| Indian Creek | White County | 2,157 | 54 | 40 |
| Indian Grove | Livingston County | 4,082 | 36 | 113 |
| Indian Head Park | Cook County | 3,719 | 1 | 3719 |
| Indian Point | Knox County | 1,444 | 36 | 40 |
| Indian Prairie | Wayne County | 608 | 37 | 16 |
| Indianola | Vermilion County | 257 | 0 | 0 |
| Indiantown | Bureau County | 656 | 36 | 18 |
| Industry | McDonough County | 438 | 0 | 0 |
| Industry (Township) | McDonough County | 670 | 37 | 18 |
| Ingalls Park | Will County | 2,947 | 1 | 2947 |
| Inverness | Cook County | 7,376 | 7 | 1054 |
| Iola | Clay County | 136 | 1 | 136 |
| Ipava | Fulton County | 421 | 0 | 0 |
| Irishtown | Clinton County | 1,192 | 25 | 48 |
| Iroquois | Iroquois County | 137 | 1 | 137 |
| Iroquois (Township) | Iroquois County | 571 | 36 | 16 |
| Irving | Montgomery County | 462 | 1 | 462 |
| Irving (Township) | Montgomery County | 949 | 34 | 28 |
| Irvington | Washington County | 613 | 1 | 613 |
| Irvington (Township) | Washington County | 1,201 | 48 | 25 |
| Isabel | Fulton County | 183 | 29 | 6 |
| Island Grove | Sangamon County | 600 | 28 | 21 |
| Island Lake | Lake County / McHenry County | 8,020 | 3 | 2673 |
| Itasca | DuPage County | 9,805 | 5 | 1961 |
| Iuka | Marion County | 464 | 1 | 464 |
| Iuka (Township) | Marion County | 956 | 36 | 27 |
| Ivesdale | Champaign County / Piatt County | 252 | 1 | 252 |
| Jackson | Effingham County | 1,185 | 37 | 32 |
| Jackson | Will County | 4,005 | 36 | 111 |
| Jacksonville | Morgan County | 18,603 | 11 | 1691 |
| Jamaica | Vermilion County | 186 | 31 | 6 |
| Jarvis | Madison County | 14,585 | 35 | 417 |
| Jasper | Wayne County | 1,708 | 33 | 52 |
| Jefferson | Stephenson County | 252 | 18 | 14 |
| Jeffersonville | Wayne County | 359 | 1 | 359 |
| Jeisyville | Christian County | 101 | 0 | 0 |
| Jerome | Sangamon County | 1,588 | 0 | 0 |
| Jersey | Jersey County | 9,780 | 47 | 208 |
| Jerseyville | Jersey County | 8,200 | 5 | 1640 |
| Jewett | Cumberland County | 220 | 1 | 220 |
| Johannisburg | Washington County | 485 | 36 | 13 |
| Johnsburg | McHenry County | 6,368 | 7 | 910 |
| Johnson | Christian County | 640 | 36 | 18 |
| Johnson | Clark County | 359 | 36 | 10 |
| Johnston City | Williamson County | 3,389 | 2 | 1695 |
| Joliet | Kendall County / Will County | 147,344 | 64 | 2302 |
| Joliet (Township) | Will County | 86,178 | 35 | 2462 |
| Jonathan Creek | Moultrie County | 991 | 37 | 27 |
| Jonesboro | Union County | 1,700 | 3 | 567 |
| Joppa | Massac County | 303 | 0 | 0 |
| Jordan | Whiteside County | 850 | 36 | 24 |
| Joshua | Fulton County | 489 | 35 | 14 |
| Joy | Mercer County | 382 | 0 | 0 |
| Jubilee | Peoria County | 1,644 | 36 | 46 |
| Junction | Gallatin County | 111 | 1 | 111 |
| Junction City | Marion County | 466 | 1 | 466 |
| Justice | Cook County | 12,608 | 3 | 4203 |
| Kampsville | Calhoun County | 304 | 1 | 304 |
| Kane | Greene County | 404 | 1 | 404 |
| Kane (Township) | Greene County | 918 | 49 | 19 |
| Kaneville | Kane County | 480 | 0 | 0 |
| Kaneville (Township) | Kane County | 1,261 | 35 | 36 |
| Kangley | LaSalle County | 233 | 0 | 0 |
| Kankakee | Kankakee County | 26,024 | 15 | 1735 |
| Kankakee (Township) | Kankakee County | 26,026 | 18 | 1446 |
| Kansas | Edgar County | 719 | 1 | 719 |
| Kansas | Woodford County | 431 | 18 | 24 |
| Kansas (Township) | Edgar County | 918 | 41 | 22 |
| Kappa | Woodford County | 240 | 0 | 0 |
| Karnak | Pulaski County | 434 | 2 | 217 |
| Kaskaskia | Fayette County | 618 | 34 | 18 |
| Keene | Adams County | 583 | 36 | 16 |
| Keensburg | Wabash County | 201 | 0 | 0 |
| Keith | Wayne County | 383 | 36 | 11 |
| Keithsburg | Mercer County | 580 | 3 | 193 |
| Keithsburg (Township) | Mercer County | 653 | 18 | 36 |
| Kell | Marion County | 207 | 1 | 207 |
| Kelly | Warren County | 333 | 35 | 10 |
| Kempton | Ford County | 206 | 0 | 0 |
| Kendall | Kendall County | 9,091 | 39 | 233 |
| Kenilworth | Cook County | 2,475 | 1 | 2475 |
| Kenney | De Witt County | 313 | 0 | 0 |
| Kent | Stephenson County | 662 | 36 | 18 |
| Kerr | Champaign County | 157 | 22 | 7 |
| Kerton | Fulton County | 116 | 24 | 5 |
| Kewanee | Henry County | 12,339 | 7 | 1763 |
| Kewanee (Township) | Henry County | 9,702 | 36 | 270 |
| Keyesport | Bond County / Clinton County | 405 | 1 | 405 |
| Kickapoo | Peoria County | 6,914 | 32 | 216 |
| Kilbourne | Mason County | 276 | 1 | 276 |
| Kilbourne (Township) | Mason County | 461 | 40 | 12 |
| Kildeer | Lake County | 4,012 | 4 | 1003 |
| Kincaid | Christian County | 1,372 | 1 | 1372 |
| Kinderhook | Pike County | 208 | 1 | 208 |
| Kinderhook (Township) | Pike County | 797 | 38 | 21 |
| King | Christian County | 228 | 37 | 6 |
| Kingston | DeKalb County | 1,169 | 1 | 1169 |
| Kingston (Township) | DeKalb County | 3,568 | 36 | 99 |
| Kingston Mines | Peoria County | 282 | 1 | 282 |
| Kinkaid | Jackson County | 457 | 36 | 13 |
| Kinmundy | Marion County | 755 | 1 | 755 |
| Kinmundy (Township) | Marion County | 1,128 | 37 | 30 |
| Kirkland | DeKalb County | 1,729 | 1 | 1729 |
| Kirkwood | Warren County | 675 | 1 | 675 |
| Knight Prairie | Hamilton County | 564 | 36 | 16 |
| Knollwood | Lake County | 1,814 | 1 | 1814 |
| Knox | Knox County | 4,750 | 35 | 136 |
| Knoxville | Knox County | 2,726 | 2 | 1363 |
| La Clede | Fayette County | 882 | 37 | 24 |
| La Fayette | Stark County | 200 | 0 | 0 |
| La Grange | Cook County | 15,322 | 3 | 5107 |
| La Grange Park | Cook County | 13,178 | 2 | 6589 |
| La Harpe | Hancock County | 1,143 | 1 | 1143 |
| La Harpe (Township) | Hancock County | 1,365 | 37 | 37 |
| La Moille | Bureau County | 679 | 1 | 679 |
| La Moille (Township) | Bureau County | 1,047 | 38 | 28 |
| La Prairie | Marshall County | 327 | 36 | 9 |
| La Rose | Marshall County | 130 | 0 | 0 |
| Lacon | Marshall County | 1,739 | 2 | 870 |
| Lacon (Township) | Marshall County | 2,260 | 17 | 133 |
| Ladd | Bureau County | 1,195 | 1 | 1195 |
| Laenna | Logan County | 550 | 35 | 16 |
| Lafayette | Coles County | 4,600 | 36 | 128 |
| Lafayette | Ogle County | 162 | 17 | 10 |
| Lagrange | Bond County | 1,105 | 46 | 24 |
| Lake | Clinton County | 938 | 30 | 31 |
| Lake Barrington | Lake County | 4,868 | 6 | 811 |
| Lake Bluff | Lake County | 5,562 | 4 | 1391 |
| Lake Camelot | Peoria County | 2,016 | 2 | 1008 |
| Lake Catherine | Lake County | 1,761 | 1 | 1761 |
| Lake Forest | Lake County | 19,446 | 17 | 1144 |
| Lake Fork | Logan County | 146 | 18 | 8 |
| Lake Holiday | LaSalle County | 4,562 | 3 | 1521 |
| Lake in the Hills | McHenry County | 28,634 | 10 | 2863 |
| Lake Ka-Ho | Macoupin County | 221 | 0 | 0 |
| Lake of the Woods | Champaign County | 2,620 | 2 | 1310 |
| Lake Petersburg | Menard County | 574 | 2 | 287 |
| Lake Summerset | Stephenson County / Winnebago County | 1,823 | 2 | 912 |
| Lake Villa | Lake County | 8,573 | 7 | 1225 |
| Lake Villa (Township) | Lake County | 39,450 | 23 | 1715 |
| Lake Zurich | Lake County | 19,877 | 7 | 2840 |
| Lakemoor | Lake County / McHenry County | 5,967 | 5 | 1193 |
| Lakewood | McHenry County | 4,001 | 5 | 800 |
| Lakewood | Shelby County | 435 | 30 | 15 |
| Lakewood Shores | Will County | 1,433 | 2 | 717 |
| Lamard | Wayne County | 1,383 | 34 | 41 |
| Lamoine | McDonough County | 474 | 37 | 13 |
| Lamotte | Crawford County | 1,907 | 51 | 37 |
| Lanark | Carroll County | 1,333 | 1 | 1333 |
| Lancaster | Stephenson County | 1,487 | 32 | 46 |
| Lanesville | Sangamon County | 202 | 36 | 6 |
| Langleyville | Christian County | 349 | 0 | 0 |
| Lansing | Cook County | 27,402 | 7 | 3915 |
| Laona | Winnebago County | 1,204 | 27 | 45 |
| LaPlace | Piatt County | 193 | 1 | 193 |
| Larkinsburg | Clay County | 614 | 37 | 17 |
| LaSalle | LaSalle County | 8,986 | 13 | 691 |
| LaSalle (Township) | LaSalle County | 12,685 | 17 | 746 |
| Latham | Logan County | 364 | 0 | 0 |
| Lawndale | McLean County | 157 | 40 | 4 |
| Lawrence | Lawrence County | 6,355 | 42 | 151 |
| Lawrenceville | Lawrence County | 4,399 | 2 | 2200 |
| Le Roy | McLean County | 3,493 | 2 | 1747 |
| Leaf River | Ogle County | 406 | 1 | 406 |
| Leaf River (Township) | Ogle County | 1,062 | 36 | 30 |
| Lebanon | St. Clair County | 4,238 | 3 | 1413 |
| Lebanon (Township) | St. Clair County | 4,265 | 36 | 118 |
| Lee | Brown County | 313 | 38 | 8 |
| Lee | DeKalb County / Lee County | 327 | 0 | 0 |
| Lee | Fulton County | 225 | 37 | 6 |
| Lee Center | Lee County | 560 | 36 | 16 |
| Leech | Wayne County | 449 | 53 | 8 |
| Leef | Madison County | 616 | 29 | 21 |
| Leepertown | Bureau County | 340 | 16 | 21 |
| Leland | LaSalle County | 914 | 1 | 914 |
| Leland Grove | Sangamon County | 1,464 | 1 | 1464 |
| Lemont | Cook County / DuPage County / Will County | 17,291 | 8 | 2161 |
| Lemont (Township) | Cook County | 22,244 | 20 | 1112 |
| Lena | Stephenson County | 2,719 | 3 | 906 |
| Lenox | Warren County | 270 | 36 | 8 |
| Lenzburg | St. Clair County | 487 | 1 | 487 |
| Lenzburg (Township) | St. Clair County | 990 | 29 | 34 |
| Leonore | LaSalle County | 123 | 0 | 0 |
| Lerna | Coles County | 273 | 0 | 0 |
| LeRoy | Boone County | 474 | 31 | 15 |
| Levan | Jackson County | 787 | 33 | 24 |
| Lewistown | Fulton County | 2,146 | 2 | 1073 |
| Lewistown (Township) | Fulton County | 2,775 | 35 | 79 |
| Lexington | McLean County | 2,026 | 2 | 1013 |
| Lexington (Township) | McLean County | 2,366 | 41 | 58 |
| Leyden | Cook County | 90,002 | 20 | 4500 |
| Liberty | Adams County | 503 | 0 | 0 |
| Liberty | Effingham County | 749 | 18 | 42 |
| Liberty (Township) | Adams County | 1,314 | 37 | 36 |
| Libertyville | Lake County | 20,205 | 9 | 2245 |
| Libertyville (Township) | Lake County | 53,370 | 35 | 1525 |
| Licking | Crawford County | 438 | 41 | 11 |
| Lily Lake | Kane County | 1,023 | 3 | 341 |
| Lima | Adams County | 148 | 0 | 0 |
| Lima (Township) | Adams County | 518 | 55 | 9 |
| Limestone | Kankakee County | 1,522 | 3 | 507 |
| Limestone | Peoria County | 18,784 | 36 | 522 |
| Limestone (Township) | Kankakee County | 4,788 | 40 | 120 |
| Lincoln | Logan County | 13,524 | 6 | 2254 |
| Lincoln | Ogle County | 454 | 36 | 13 |
| Lincolnshire | Lake County | 7,893 | 5 | 1579 |
| Lincolnwood | Cook County | 12,245 | 3 | 4082 |
| Lindenhurst | Lake County | 14,216 | 5 | 2843 |
| Linder | Greene County | 320 | 35 | 9 |
| Linn | Woodford County | 288 | 37 | 8 |
| Lisbon | Kendall County | 308 | 2 | 154 |
| Lisbon (Township) | Kendall County | 944 | 37 | 26 |
| Lisle | DuPage County | 23,270 | 7 | 3324 |
| Lisle (Township) | DuPage County | 119,558 | 35 | 3416 |
| Litchfield | Montgomery County | 6,715 | 9 | 746 |
| Little Mackinaw | Tazewell County | 1,502 | 36 | 42 |
| Little Rock | Kendall County | 14,037 | 35 | 401 |
| Little York | Warren County | 311 | 0 | 0 |
| Littleton | Schuyler County | 160 | 1 | 160 |
| Littleton (Township) | Schuyler County | 300 | 37 | 8 |
| Lively Grove | Washington County | 660 | 36 | 18 |
| Liverpool | Fulton County | 123 | 0 | 0 |
| Liverpool (Township) | Fulton County | 517 | 40 | 13 |
| Livingston | Madison County | 804 | 1 | 804 |
| Loami | Sangamon County | 750 | 1 | 750 |
| Loami (Township) | Sangamon County | 1,066 | 21 | 51 |
| Lockport | Will County | 25,615 | 11 | 2329 |
| Lockport (Township) | Will County | 59,979 | 36 | 1666 |
| Locust | Christian County | 1,768 | 36 | 49 |
| Loda | Iroquois County | 398 | 1 | 398 |
| Loda (Township) | Iroquois County | 1,376 | 39 | 35 |
| Logan | Peoria County | 3,084 | 37 | 83 |
| Lomax | Henderson County | 401 | 1 | 401 |
| Lomax (Township) | Henderson County | 764 | 28 | 27 |
| Lombard | DuPage County | 44,303 | 10 | 4430 |
| London Mills | Fulton County / Knox County | 376 | 1 | 376 |
| Lone Grove | Fayette County | 630 | 37 | 17 |
| Long Branch | Saline County | 235 | 18 | 13 |
| Long Creek | Macon County | 1,273 | 3 | 424 |
| Long Creek (Township) | Macon County | 10,032 | 38 | 264 |
| Long Grove | Lake County | 7,905 | 12 | 659 |
| Long Lake | Lake County | 3,136 | 1 | 3136 |
| Long Point | Livingston County | 214 | 0 | 0 |
| Long Point (Township) | Livingston County | 473 | 36 | 13 |
| Longview | Champaign County | 148 | 0 | 0 |
| Looking Glass | Clinton County | 6,234 | 50 | 125 |
| Loraine | Adams County | 302 | 1 | 302 |
| Loraine | Henry County | 281 | 35 | 8 |
| Loran | Stephenson County | 1,348 | 35 | 39 |
| Lost Nation | Ogle County | 693 | 2 | 347 |
| Lostant | LaSalle County | 480 | 1 | 480 |
| Loudon | Fayette County | 937 | 60 | 16 |
| Louisville | Clay County | 1,095 | 1 | 1095 |
| Louisville (Township) | Clay County | 1,581 | 36 | 44 |
| Love | Vermilion County | 239 | 20 | 12 |
| Lovejoy | Iroquois County | 367 | 35 | 10 |
| Loves Park | Boone County / Winnebago County | 23,371 | 16 | 1461 |
| Lovington | Moultrie County | 1,026 | 1 | 1026 |
| Lovington (Township) | Moultrie County | 1,526 | 52 | 29 |
| Lowe | Moultrie County | 1,683 | 41 | 41 |
| Lucas | Effingham County | 479 | 35 | 14 |
| Ludlow | Champaign County | 356 | 0 | 0 |
| Ludlow (Township) | Champaign County | 4,167 | 37 | 113 |
| Lukin | Lawrence County | 379 | 50 | 8 |
| Lyman | Ford County | 471 | 42 | 11 |
| Lynchburg | Mason County | 254 | 42 | 6 |
| Lyndon | Whiteside County | 610 | 1 | 610 |
| Lyndon (Township) | Whiteside County | 1,014 | 27 | 38 |
| Lynn | Henry County | 722 | 36 | 20 |
| Lynn | Knox County | 291 | 35 | 8 |
| Lynnville | Morgan County | 111 | 0 | 0 |
| Lynnville | Ogle County | 607 | 35 | 17 |
| Lynwood | Cook County | 9,194 | 5 | 1839 |
| Lyons | Cook County | 10,372 | 2 | 5186 |
| Lyons (Township) | Cook County | 110,627 | 36 | 3073 |
| Machesney Park | Winnebago County | 22,677 | 13 | 1744 |
| Mackinaw | Tazewell County | 1,884 | 1 | 1884 |
| Mackinaw (Township) | Tazewell County | 4,326 | 36 | 120 |
| Macomb | McDonough County | 17,413 | 11 | 1583 |
| Macomb (Township) | McDonough County | 458 | 32 | 14 |
| Macomb City | McDonough County | 17,413 | 11 | 1583 |
| Macon | Bureau County | 195 | 37 | 5 |
| Macon | Macon County | 1,112 | 1 | 1112 |
| Madison | Madison County / St. Clair County | 3,758 | 12 | 313 |
| Madison | Richland County | 785 | 41 | 19 |
| Maeystown | Monroe County | 162 | 0 | 0 |
| Magnolia | Putnam County | 248 | 0 | 0 |
| Magnolia (Township) | Putnam County | 1,028 | 42 | 24 |
| Mahomet | Champaign County | 8,605 | 10 | 861 |
| Mahomet (Township) | Champaign County | 13,584 | 33 | 412 |
| Maine | Cook County | 134,437 | 26 | 5171 |
| Maine | Grundy County | 317 | 18 | 18 |
| Makanda | Jackson County | 530 | 5 | 106 |
| Makanda (Township) | Jackson County | 4,097 | 37 | 111 |
| Malden | Bureau County | 341 | 0 | 0 |
| Malone | Tazewell County | 211 | 30 | 7 |
| Malta | DeKalb County | 1,158 | 1 | 1158 |
| Malta (Township) | DeKalb County | 1,598 | 35 | 46 |
| Manchester | Boone County | 877 | 34 | 26 |
| Manchester | Scott County | 269 | 1 | 269 |
| Manhattan | Will County | 8,240 | 7 | 1177 |
| Manhattan (Township) | Will County | 10,350 | 37 | 280 |
| Manito | Mason County | 1,486 | 2 | 743 |
| Manito (Township) | Mason County | 2,243 | 44 | 51 |
| Manlius | Bureau County | 334 | 0 | 0 |
| Manlius | LaSalle County | 5,963 | 24 | 248 |
| Manlius (Township) | Bureau County | 606 | 36 | 17 |
| Mansfield | Piatt County | 948 | 1 | 948 |
| Manteno | Kankakee County | 9,002 | 5 | 1800 |
| Manteno (Township) | Kankakee County | 10,934 | 37 | 296 |
| Maple Park | DeKalb County / Kane County | 1,365 | 2 | 683 |
| Mapleton | Peoria County | 269 | 1 | 269 |
| Maquon | Knox County | 260 | 0 | 0 |
| Maquon (Township) | Knox County | 518 | 36 | 14 |
| Marengo | McHenry County | 7,437 | 8 | 930 |
| Marengo (Township) | McHenry County | 7,336 | 36 | 204 |
| Marietta | Fulton County | 109 | 0 | 0 |
| Marine | Madison County | 922 | 1 | 922 |
| Marine (Township) | Madison County | 2,172 | 35 | 62 |
| Marion | Johnson County / Williamson County | 17,520 | 17 | 1031 |
| Marion | Lee County | 217 | 36 | 6 |
| Marion | Ogle County | 3,919 | 45 | 87 |
| Marissa | St. Clair County | 1,806 | 7 | 258 |
| Marissa (Township) | St. Clair County | 2,261 | 34 | 67 |
| Mark | Putnam County | 539 | 1 | 539 |
| Markham | Cook County | 12,314 | 5 | 2463 |
| Maroa | Macon County | 1,711 | 2 | 856 |
| Maroa (Township) | Macon County | 1,996 | 42 | 48 |
| Marquette Heights | Tazewell County | 2,645 | 1 | 2645 |
| Marrowbone | Moultrie County | 1,605 | 39 | 41 |
| Marseilles | LaSalle County | 4,834 | 9 | 537 |
| Marshall | Clark County | 3,811 | 4 | 953 |
| Marshall (Township) | Clark County | 4,396 | 32 | 137 |
| Martin | Crawford County | 496 | 43 | 12 |
| Martin | McLean County | 1,239 | 36 | 34 |
| Martinsburg | Pike County | 404 | 38 | 11 |
| Martinsville | Clark County | 1,088 | 2 | 544 |
| Martinsville (Township) | Clark County | 1,497 | 42 | 36 |
| Martinton | Iroquois County | 343 | 0 | 0 |
| Martinton (Township) | Iroquois County | 863 | 54 | 16 |
| Maryland | Ogle County | 506 | 36 | 14 |
| Maryville | Madison County | 7,952 | 6 | 1325 |
| Mascoutah | St. Clair County | 7,994 | 10 | 799 |
| Mascoutah (Township) | St. Clair County | 8,653 | 39 | 222 |
| Mason | Effingham County | 336 | 1 | 336 |
| Mason (Township) | Effingham County | 1,321 | 37 | 36 |
| Mason City | Mason County | 2,119 | 1 | 2119 |
| Mason City (Township) | Mason County | 2,384 | 35 | 68 |
| Massilon | Wayne County | 168 | 33 | 5 |
| Matherville | Mercer County | 662 | 0 | 0 |
| Matteson | Cook County / Will County | 19,448 | 9 | 2161 |
| Mattoon | Coles County | 17,615 | 10 | 1762 |
| Mattoon (Township) | Coles County | 14,995 | 36 | 417 |
| Maunie | White County | 130 | 0 | 0 |
| Maxwell | Sangamon County | 185 | 21 | 9 |
| May | Christian County | 1,489 | 36 | 41 |
| May | Lee County | 284 | 35 | 8 |
| Mayberry | Hamilton County | 474 | 55 | 9 |
| Mayfield | DeKalb County | 937 | 35 | 27 |
| Maywood | Cook County | 23,158 | 3 | 7719 |
| Mazon | Grundy County | 967 | 1 | 967 |
| Mazon (Township) | Grundy County | 1,430 | 35 | 41 |
| McClellan | Jefferson County | 1,226 | 36 | 34 |
| McClure | Alexander County | 301 | 2 | 151 |
| McCook | Cook County | 220 | 3 | 73 |
| McCullom Lake | McHenry County | 1,008 | 0 | 0 |
| McHenry | McHenry County | 27,061 | 14 | 1933 |
| McHenry (Township) | McHenry County | 46,905 | 45 | 1042 |
| McKee | Adams County | 160 | 36 | 4 |
| McKendree | Vermilion County | 753 | 29 | 26 |
| McLean | McLean County | 795 | 1 | 795 |
| McLeansboro | Hamilton County | 2,746 | 3 | 915 |
| McLeansboro (Township) | Hamilton County | 3,650 | 36 | 101 |
| McNabb | Putnam County | 260 | 0 | 0 |
| Meacham | Marion County | 351 | 37 | 9 |
| Mechanicsburg | Sangamon County | 661 | 1 | 661 |
| Mechanicsburg (Township) | Sangamon County | 2,293 | 36 | 64 |
| Media (Township) | Henderson County | 350 | 36 | 10 |
| Medina | Peoria County | 12,132 | 27 | 449 |
| Medora | Jersey County / Macoupin County | 392 | 0 | 0 |
| Melrose | Adams County | 5,520 | 45 | 123 |
| Melrose | Clark County | 330 | 33 | 10 |
| Melrose Park | Cook County | 24,703 | 4 | 6176 |
| Melvin | Ford County | 410 | 0 | 0 |
| Mendon | Adams County | 961 | 1 | 961 |
| Mendon (Township) | Adams County | 1,486 | 37 | 40 |
| Mendota | LaSalle County | 6,994 | 5 | 1399 |
| Mendota (Township) | LaSalle County | 7,135 | 36 | 198 |
| Menominee | Jo Daviess County | 240 | 2 | 120 |
| Menominee (Township) | Jo Daviess County | 1,063 | 28 | 38 |
| Mercer | Mercer County | 3,829 | 35 | 109 |
| Meredosia | Morgan County | 972 | 1 | 972 |
| Meriden | LaSalle County | 306 | 35 | 9 |
| Meridian | Clinton County | 557 | 37 | 15 |
| Merrionette Park | Cook County | 1,858 | 0 | 0 |
| Metamora | Woodford County | 3,699 | 2 | 1850 |
| Metamora (Township) | Woodford County | 4,376 | 36 | 122 |
| Metcalf | Edgar County | 171 | 1 | 171 |
| Metropolis | Massac County | 5,945 | 6 | 991 |
| Mettawa | Lake County | 543 | 5 | 109 |
| Middlefork | Vermilion County | 1,348 | 64 | 21 |
| Middleport | Iroquois County | 3,962 | 36 | 110 |
| Middletown | Logan County | 304 | 0 | 0 |
| Midlothian | Cook County | 14,346 | 3 | 4782 |
| Milan | DeKalb County | 329 | 35 | 9 |
| Milan | Rock Island County | 4,991 | 6 | 832 |
| Milford | Iroquois County | 1,171 | 1 | 1171 |
| Milford (Township) | Iroquois County | 1,490 | 44 | 34 |
| Milks Grove | Iroquois County | 197 | 36 | 5 |
| Mill Shoals | Wayne County / White County | 197 | 1 | 197 |
| Mill Shoals (Township) | White County | 624 | 53 | 12 |
| Millbrook | Kendall County | 328 | 2 | 164 |
| Millbrook | Peoria County | 468 | 37 | 13 |
| Milledgeville | Carroll County | 952 | 1 | 952 |
| Miller | LaSalle County | 597 | 35 | 17 |
| Millersburg | Mercer County | 697 | 36 | 19 |
| Millington | Kendall County / LaSalle County | 659 | 1 | 659 |
| Mills | Bond County | 517 | 37 | 14 |
| Millstadt | St. Clair County | 3,857 | 3 | 1286 |
| Millstadt (Township) | St. Clair County | 6,385 | 47 | 136 |
| Milo | Bureau County | 194 | 35 | 6 |
| Milton | DuPage County | 116,547 | 34 | 3428 |
| Milton | Pike County | 266 | 0 | 0 |
| Mineral | Bureau County | 222 | 1 | 222 |
| Mineral (Township) | Bureau County | 458 | 36 | 13 |
| Minier | Tazewell County | 1,190 | 1 | 1190 |
| Minonk | Woodford County | 1,974 | 2 | 987 |
| Minonk (Township) | Woodford County | 2,184 | 37 | 59 |
| Minooka | Grundy County / Kendall County / Will County | 11,397 | 9 | 1266 |
| Mission | LaSalle County | 4,293 | 32 | 134 |
| Mississippi | Jersey County | 1,901 | 36 | 53 |
| Missouri | Brown County | 138 | 35 | 4 |
| Mitchell | Madison County | 1,290 | 1 | 1290 |
| Moccasin | Effingham County | 467 | 36 | 13 |
| Modesto | Macoupin County | 178 | 1 | 178 |
| Mokena | Will County | 20,159 | 9 | 2240 |
| Moline | Rock Island County | 41,356 | 17 | 2433 |
| Moline (Township) | Rock Island County | 22,332 | 6 | 3722 |
| Momence | Kankakee County | 3,094 | 2 | 1547 |
| Momence (Township) | Kankakee County | 3,611 | 42 | 86 |
| Mona | Ford County | 303 | 36 | 8 |
| Monee | Will County | 5,061 | 4 | 1265 |
| Monee (Township) | Will County | 15,379 | 36 | 427 |
| Money Creek | McLean County | 1,077 | 39 | 28 |
| Monmouth | Warren County | 8,886 | 4 | 2222 |
| Monmouth (Township) | Warren County | 9,894 | 37 | 267 |
| Monroe | Ogle County | 1,479 | 36 | 41 |
| Monroe Center | Ogle County | 435 | 1 | 435 |
| Montebello | Hancock County | 3,300 | 37 | 89 |
| Montezuma | Pike County | 527 | 34 | 16 |
| Montgomery | Crawford County | 627 | 54 | 12 |
| Montgomery | Kane County / Kendall County | 19,638 | 9 | 2182 |
| Montgomery | Woodford County | 2,456 | 36 | 68 |
| Monticello | Piatt County | 5,534 | 4 | 1384 |
| Monticello (Township) | Piatt County | 5,880 | 48 | 123 |
| Montmorency | Whiteside County | 2,493 | 36 | 69 |
| Montrose | Cumberland County / Effingham County | 195 | 1 | 195 |
| Moores Prairie | Jefferson County | 335 | 36 | 9 |
| Moraine | Lake County | 33,660 | 12 | 2805 |
| Morgan | Coles County | 344 | 26 | 13 |
| Moro | Madison County | 3,470 | 32 | 108 |
| Morris | Grundy County | 15,053 | 10 | 1505 |
| Morris (Township) | Grundy County | 7,690 | 3 | 2563 |
| Morrison | Whiteside County | 3,988 | 3 | 1329 |
| Morrisonville | Christian County | 998 | 1 | 998 |
| Morton | Tazewell County | 16,277 | 13 | 1252 |
| Morton (Township) | Tazewell County | 16,918 | 36 | 470 |
| Morton Grove | Cook County | 22,796 | 5 | 4559 |
| Mosquito | Christian County | 367 | 47 | 8 |
| Mound | Effingham County | 3,624 | 37 | 98 |
| Mound | McDonough County | 260 | 36 | 7 |
| Mound City | Pulaski County | 504 | 1 | 504 |
| Mound Station | Brown County | 116 | 1 | 116 |
| Mounds | Pulaski County | 684 | 1 | 684 |
| Mount Auburn | Christian County | 450 | 1 | 450 |
| Mount Auburn (Township) | Christian County | 968 | 46 | 21 |
| Mount Carmel | Wabash County | 7,001 | 5 | 1400 |
| Mount Carroll | Carroll County | 1,571 | 2 | 786 |
| Mount Carroll (Township) | Carroll County | 2,102 | 38 | 55 |
| Mount Clare | Macoupin County | 263 | 2 | 132 |
| Mount Erie (Township) | Wayne County | 359 | 53 | 7 |
| Mount Hope | McLean County | 1,063 | 49 | 22 |
| Mount Morris | Ogle County | 2,794 | 2 | 1397 |
| Mount Morris (Township) | Ogle County | 3,710 | 36 | 103 |
| Mount Olive | Macoupin County | 1,939 | 1 | 1939 |
| Mount Olive (Township) | Macoupin County | 3,057 | 18 | 170 |
| Mount Pleasant | Whiteside County | 4,713 | 36 | 131 |
| Mount Prospect | Cook County | 53,719 | 11 | 4884 |
| Mount Pulaski | Logan County | 1,464 | 1 | 1464 |
| Mount Pulaski (Township) | Logan County | 1,978 | 54 | 37 |
| Mount Sterling | Brown County | 1,909 | 1 | 1909 |
| Mount Sterling (Township) | Brown County | 4,410 | 37 | 119 |
| Mount Vernon | Jefferson County | 14,723 | 15 | 982 |
| Mount Vernon (Township) | Jefferson County | 12,897 | 37 | 349 |
| Mount Zion | Macon County | 5,795 | 4 | 1449 |
| Mount Zion (Township) | Macon County | 7,007 | 67 | 105 |
| Mountain | Saline County | 335 | 42 | 8 |
| Moweaqua | Christian County / Shelby County | 1,714 | 2 | 857 |
| Moweaqua (Township) | Shelby County | 1,880 | 17 | 111 |
| Mulberry Grove | Bond County | 575 | 1 | 575 |
| Mulberry Grove (Township) | Bond County | 1,263 | 47 | 27 |
| Mulkeytown | Franklin County | 178 | 0 | 0 |
| Muncie | Vermilion County | 138 | 0 | 0 |
| Mundelein | Lake County | 31,051 | 10 | 3105 |
| Munson | Henry County | 390 | 36 | 11 |
| Murdock | Douglas County | 227 | 31 | 7 |
| Murphysboro | Jackson County | 7,406 | 5 | 1481 |
| Murphysboro (Township) | Jackson County | 9,814 | 36 | 273 |
| Murrayville | Morgan County | 548 | 0 | 0 |
| Na-Au-Say | Kendall County | 8,863 | 34 | 261 |
| Nachusa | Lee County | 462 | 29 | 16 |
| Nameoki | Madison County | 12,271 | 22 | 558 |
| Naperville | DuPage County / Will County | 148,449 | 39 | 3806 |
| Naperville (Township) | DuPage County | 101,947 | 35 | 2913 |
| Naplate | LaSalle County | 470 | 0 | 0 |
| Naples | Scott County | 119 | 1 | 119 |
| Nashville | Washington County | 3,011 | 3 | 1004 |
| Nashville (Township) | Washington County | 3,411 | 35 | 97 |
| Nason | Jefferson County | 233 | 1 | 233 |
| Nauvoo | Hancock County | 1,063 | 3 | 354 |
| Nauvoo (Township) | Hancock County | 1,070 | 4 | 268 |
| Nebo | Pike County | 328 | 0 | 0 |
| Nebraska | Livingston County | 1,364 | 36 | 38 |
| Nelson | Lee County | 159 | 0 | 0 |
| Nelson (Township) | Lee County | 825 | 23 | 36 |
| Neoga | Cumberland County | 1,602 | 1 | 1602 |
| Neoga (Township) | Cumberland County | 3,043 | 55 | 55 |
| Neponset | Bureau County | 436 | 1 | 436 |
| Neponset (Township) | Bureau County | 688 | 36 | 19 |
| Nettle Creek | Grundy County | 489 | 36 | 14 |
| Nevada | Livingston County | 220 | 37 | 6 |
| New Athens | St. Clair County | 1,884 | 2 | 942 |
| New Athens (Township) | St. Clair County | 2,442 | 34 | 72 |
| New Baden | Clinton County / St. Clair County | 3,241 | 2 | 1621 |
| New Berlin | Sangamon County | 1,333 | 1 | 1333 |
| New Berlin (Township) | Sangamon County | 1,504 | 31 | 49 |
| New Boston | Mercer County | 650 | 1 | 650 |
| New Boston (Township) | Mercer County | 1,135 | 51 | 22 |
| New Burnside | Johnson County | 214 | 1 | 214 |
| New Canton | Pike County | 346 | 1 | 346 |
| New Douglas | Madison County | 307 | 1 | 307 |
| New Douglas (Township) | Madison County | 494 | 21 | 24 |
| New Grand Chain | Pulaski County | 182 | 1 | 182 |
| New Haven | Gallatin County / White County | 382 | 1 | 382 |
| New Haven (Township) | Gallatin County | 418 | 44 | 10 |
| New Holland | Logan County | 268 | 0 | 0 |
| New Lenox | Will County | 26,926 | 16 | 1683 |
| New Lenox (Township) | Will County | 42,798 | 36 | 1189 |
| New Milford | Winnebago County | 699 | 1 | 699 |
| New Minden | Washington County | 206 | 0 | 0 |
| New Salem | McDonough County | 337 | 36 | 9 |
| New Salem | Pike County | 134 | 1 | 134 |
| New Salem (Township) | Pike County | 553 | 38 | 15 |
| New Trier | Cook County | 55,734 | 16 | 3483 |
| Newark | Kendall County | 1,028 | 1 | 1028 |
| Newburg | Pike County | 904 | 37 | 24 |
| Newcomb | Champaign County | 1,267 | 36 | 35 |
| Newell | Vermilion County | 12,886 | 50 | 258 |
| Newman | Douglas County | 833 | 1 | 833 |
| Newman (Township) | Douglas County | 1,046 | 41 | 26 |
| Newport | Lake County | 6,667 | 32 | 208 |
| Newton | Jasper County | 2,863 | 2 | 1432 |
| Newton | Whiteside County | 429 | 36 | 12 |
| Newtown | Livingston County | 705 | 36 | 20 |
| Niantic | Macon County | 655 | 1 | 655 |
| Niantic (Township) | Macon County | 784 | 29 | 27 |
| Niles | Cook County | 28,938 | 6 | 4823 |
| Niles (Township) | Cook County | 102,925 | 21 | 4901 |
| Nilwood | Macoupin County | 229 | 0 | 0 |
| Nilwood (Township) | Macoupin County | 605 | 36 | 17 |
| Nixon | De Witt County | 545 | 28 | 19 |
| Noble | Richland County | 641 | 1 | 641 |
| Noble (Township) | Richland County | 1,358 | 41 | 33 |
| Nokomis | Montgomery County | 2,110 | 1 | 2110 |
| Nokomis (Township) | Montgomery County | 2,751 | 36 | 76 |
| Nora | Jo Daviess County | 116 | 1 | 116 |
| Nora (Township) | Jo Daviess County | 353 | 25 | 14 |
| Normal | McLean County | 54,469 | 18 | 3026 |
| Normal (Township) | McLean County | 54,471 | 32 | 1702 |
| Norman | Grundy County | 309 | 17 | 18 |
| Norridge | Cook County | 14,152 | 2 | 7076 |
| Norris | Fulton County | 200 | 0 | 0 |
| Norris City | White County | 1,151 | 1 | 1151 |
| North Aurora | Kane County | 18,057 | 7 | 2580 |
| North Barrington | Lake County | 2,952 | 5 | 590 |
| North Chicago | Lake County | 29,615 | 8 | 3702 |
| North City | Franklin County | 569 | 2 | 285 |
| North Fork | Gallatin County | 349 | 36 | 10 |
| North Henderson | Mercer County | 174 | 0 | 0 |
| North Henderson (Township) | Mercer County | 393 | 35 | 11 |
| North Litchfield | Montgomery County | 4,822 | 36 | 134 |
| North Muddy | Jasper County | 775 | 51 | 15 |
| North Okaw | Coles County | 942 | 54 | 17 |
| North Otter | Macoupin County | 769 | 36 | 21 |
| North Palmyra | Macoupin County | 804 | 36 | 22 |
| North Pekin | Tazewell County | 1,545 | 1 | 1545 |
| North Riverside | Cook County | 6,429 | 2 | 3215 |
| North Utica | LaSalle County | 1,336 | 3 | 445 |
| Northbrook | Cook County | 32,958 | 13 | 2535 |
| Northeast | Adams County | 808 | 37 | 22 |
| Northern | Franklin County | 462 | 36 | 13 |
| Northfield | Cook County | 5,386 | 3 | 1795 |
| Northfield (Township) | Cook County | 86,578 | 34 | 2546 |
| Northlake | Cook County | 12,161 | 3 | 4054 |
| Northville | LaSalle County | 7,129 | 33 | 216 |
| Norton | Kankakee County | 919 | 50 | 18 |
| Norwood | Peoria County | 459 | 0 | 0 |
| Norwood Park | Cook County | 25,618 | 4 | 6405 |
| Nunda | McHenry County | 37,581 | 47 | 800 |
| O'Fallon | St. Clair County | 29,583 | 15 | 1972 |
| O'Fallon (Township) | St. Clair County | 26,540 | 35 | 758 |
| Oak Brook | Cook County / DuPage County | 8,016 | 8 | 1002 |
| Oak Forest | Cook County | 27,173 | 6 | 4529 |
| Oak Grove | Rock Island County | 591 | 1 | 591 |
| Oak Lawn | Cook County | 55,022 | 9 | 6114 |
| Oak Park | Cook County | 52,381 | 5 | 10476 |
| Oak Park (Township) | Cook County | 52,381 | 5 | 10476 |
| Oak Run | Knox County | 524 | 4 | 131 |
| Oakbrook Terrace | DuPage County | 2,098 | 1 | 2098 |
| Oakdale | Washington County | 200 | 2 | 100 |
| Oakdale (Township) | Washington County | 568 | 37 | 15 |
| Oakford | Menard County | 276 | 0 | 0 |
| Oakland | Coles County | 854 | 1 | 854 |
| Oakland | Schuyler County | 127 | 36 | 4 |
| Oakley | Macon County | 1,026 | 29 | 35 |
| Oakwood | Vermilion County | 1,485 | 1 | 1485 |
| Oakwood (Township) | Vermilion County | 3,255 | 64 | 51 |
| Oakwood Hills | McHenry County | 2,028 | 1 | 2028 |
| Oblong | Crawford County | 1,371 | 1 | 1371 |
| Oblong (Township) | Crawford County | 2,612 | 57 | 46 |
| Oconee | Shelby County | 172 | 0 | 0 |
| Oconee (Township) | Shelby County | 760 | 55 | 14 |
| Odell | Livingston County | 964 | 1 | 964 |
| Odell (Township) | Livingston County | 1,186 | 36 | 33 |
| Odin | Marion County | 1,009 | 1 | 1009 |
| Odin (Township) | Marion County | 1,628 | 18 | 90 |
| Ogden | Champaign County | 800 | 1 | 800 |
| Ogden (Township) | Champaign County | 1,623 | 38 | 43 |
| Oglesby | LaSalle County | 3,559 | 4 | 890 |
| Ohio | Bureau County | 480 | 1 | 480 |
| Ohio (Township) | Bureau County | 769 | 38 | 20 |
| Ohio Grove | Mercer County | 260 | 37 | 7 |
| Ohlman | Montgomery County | 126 | 0 | 0 |
| Okaw | Shelby County | 901 | 31 | 29 |
| Okawville | Washington County | 1,360 | 2 | 680 |
| Okawville (Township) | Washington County | 1,893 | 36 | 53 |
| Old Mill Creek | Lake County | 167 | 11 | 15 |
| Old Ripley (Township) | Bond County | 806 | 44 | 18 |
| Old Shawneetown | Gallatin County | 164 | 1 | 164 |
| Old Town | McLean County | 3,002 | 36 | 83 |
| Olio | Woodford County | 4,875 | 31 | 157 |
| Olive | Madison County | 1,706 | 31 | 55 |
| Olive Branch | Alexander County | 506 | 10 | 51 |
| Olivet | Vermilion County | 411 | 2 | 206 |
| Olmsted | Pulaski County | 294 | 3 | 98 |
| Olney | Richland County | 8,674 | 7 | 1239 |
| Olney (Township) | Richland County | 9,859 | 47 | 210 |
| Olympia Fields | Cook County | 4,790 | 3 | 1597 |
| Omaha | Gallatin County | 228 | 1 | 228 |
| Omaha (Township) | Gallatin County | 429 | 19 | 23 |
| Omega | Marion County | 477 | 35 | 14 |
| Omphghent | Madison County | 2,346 | 33 | 71 |
| Onarga | Iroquois County | 1,264 | 2 | 632 |
| Onarga (Township) | Iroquois County | 1,546 | 49 | 32 |
| Oneco | Stephenson County | 1,248 | 27 | 46 |
| Oneida | Knox County | 662 | 1 | 662 |
| Ontario | Knox County | 883 | 36 | 25 |
| Opdyke | Jefferson County | 187 | 1 | 187 |
| Ophir | LaSalle County | 485 | 34 | 14 |
| Oquawka | Henderson County | 1,252 | 1 | 1252 |
| Oquawka (Township) | Henderson County | 1,827 | 24 | 76 |
| Ora | Jackson County | 481 | 37 | 13 |
| Oran | Logan County | 359 | 34 | 11 |
| Orange | Clark County | 214 | 37 | 6 |
| Orange | Knox County | 524 | 36 | 15 |
| Orangeville | Stephenson County | 752 | 1 | 752 |
| Orchard | Wayne County | 584 | 37 | 16 |
| Oreana | Macon County | 811 | 0 | 0 |
| Oregon | Ogle County | 3,470 | 2 | 1735 |
| Oregon-Nashua | Ogle County | 4,602 | 38 | 121 |
| Orel | Wayne County | 1,376 | 47 | 29 |
| Orient | Franklin County | 343 | 1 | 343 |
| Orion | Fulton County | 1,145 | 36 | 32 |
| Orion | Henry County | 1,798 | 1 | 1798 |
| Orland | Cook County | 97,893 | 36 | 2719 |
| Orland Hills | Cook County | 7,023 | 1 | 7023 |
| Orland Park | Cook County / Will County | 57,857 | 22 | 2630 |
| Orvil | Logan County | 1,022 | 42 | 24 |
| Osage | LaSalle County | 263 | 38 | 7 |
| Osceola | Stark County | 900 | 36 | 25 |
| Osco | Henry County | 445 | 36 | 12 |
| Oskaloosa | Clay County | 309 | 37 | 8 |
| Oswego | Kendall County / Will County | 36,252 | 15 | 2417 |
| Oswego (Township) | Kendall County | 57,760 | 40 | 1444 |
| Otego | Fayette County | 1,475 | 35 | 42 |
| Ottawa | LaSalle County | 18,063 | 13 | 1389 |
| Ottawa (Township) | LaSalle County | 11,178 | 15 | 745 |
| Otter Creek | Jersey County | 977 | 36 | 27 |
| Otter Creek | LaSalle County | 2,824 | 36 | 78 |
| Otterville | Jersey County | 118 | 1 | 118 |
| Otto | Kankakee County | 2,474 | 48 | 52 |
| Owaneco | Christian County | 223 | 0 | 0 |
| Owego | Livingston County | 310 | 36 | 9 |
| Owen | Winnebago County | 3,656 | 35 | 104 |
| Oxford | Henry County | 1,159 | 36 | 32 |
| Palatine | Cook County | 67,482 | 14 | 4820 |
| Palatine (Township) | Cook County | 111,075 | 36 | 3085 |
| Palestine | Crawford County | 1,273 | 1 | 1273 |
| Palestine | Woodford County | 1,027 | 37 | 28 |
| Palmer | Christian County | 205 | 1 | 205 |
| Palmyra | Lee County | 2,759 | 35 | 79 |
| Palmyra | Macoupin County | 659 | 1 | 659 |
| Palos | Cook County | 53,611 | 34 | 1577 |
| Palos Heights | Cook County | 12,520 | 4 | 3130 |
| Palos Hills | Cook County | 17,060 | 4 | 4265 |
| Palos Park | Cook County | 4,736 | 6 | 789 |
| Pana | Christian County / Shelby County | 5,376 | 4 | 1344 |
| Pana (Township) | Christian County | 6,127 | 49 | 125 |
| Panama | Bond County / Montgomery County | 319 | 0 | 0 |
| Panola (Township) | Woodford County | 354 | 36 | 10 |
| Panther Creek | Cass County | 259 | 36 | 7 |
| Papineau | Iroquois County | 149 | 0 | 0 |
| Papineau (Township) | Iroquois County | 455 | 29 | 16 |
| Paradise | Coles County | 1,291 | 23 | 56 |
| Paris | Edgar County | 8,285 | 6 | 1381 |
| Paris (Township) | Edgar County | 9,189 | 45 | 204 |
| Park City | Lake County | 7,438 | 1 | 7438 |
| Park Forest | Cook County / Will County | 21,210 | 5 | 4242 |
| Park Ridge | Cook County | 36,950 | 7 | 5279 |
| Parker | Clark County | 174 | 36 | 5 |
| Parkersburg | Richland County | 200 | 1 | 200 |
| Partridge | Woodford County | 586 | 26 | 23 |
| Patoka | Marion County | 547 | 1 | 547 |
| Patoka (Township) | Marion County | 983 | 35 | 28 |
| Patterson | Greene County | 590 | 47 | 13 |
| Patton | Ford County | 4,911 | 61 | 81 |
| Paw Paw | DeKalb County | 332 | 38 | 9 |
| Paw Paw | Lee County | 848 | 1 | 848 |
| Pawnee | Sangamon County | 2,640 | 1 | 2640 |
| Pawnee (Township) | Sangamon County | 2,938 | 27 | 109 |
| Paxton | Ford County | 4,125 | 3 | 1375 |
| Payson | Adams County | 990 | 1 | 990 |
| Payson (Township) | Adams County | 1,735 | 38 | 46 |
| Pea Ridge | Brown County | 183 | 37 | 5 |
| Peach Orchard | Ford County | 551 | 24 | 23 |
| Pearl | Pike County | 132 | 2 | 66 |
| Pearl (Township) | Pike County | 268 | 25 | 11 |
| Pearl City | Stephenson County | 783 | 1 | 783 |
| Pecatonica | Winnebago County | 2,078 | 1 | 2078 |
| Pecatonica (Township) | Winnebago County | 4,154 | 35 | 119 |
| Pekin | Peoria County / Tazewell County | 32,045 | 15 | 2136 |
| Pekin (Township) | Tazewell County | 28,223 | 12 | 2352 |
| Pella | Ford County | 158 | 36 | 4 |
| Pembroke | Kankakee County | 2,074 | 52 | 40 |
| Pendleton | Jefferson County | 1,174 | 35 | 34 |
| Penfield | Champaign County | 143 | 0 | 0 |
| Penn | Shelby County | 103 | 24 | 4 |
| Penn | Stark County | 315 | 36 | 9 |
| Pennsylvania | Mason County | 188 | 36 | 5 |
| Peoria | Peoria County | 110,417 | 48 | 2300 |
| Peoria City | Peoria County | 100,084 | 40 | 2502 |
| Peoria Heights | Peoria County / Tazewell County | 5,779 | 2 | 2890 |
| Peotone | Will County | 4,105 | 2 | 2053 |
| Peotone (Township) | Will County | 4,368 | 36 | 121 |
| Percy | Randolph County | 919 | 1 | 919 |
| Perry | Pike County | 382 | 0 | 0 |
| Perry (Township) | Pike County | 571 | 37 | 15 |
| Perryton | Mercer County | 439 | 36 | 12 |
| Persifer | Knox County | 930 | 35 | 27 |
| Peru | Bureau County / LaSalle County | 9,730 | 10 | 973 |
| Peru (Township) | LaSalle County | 10,112 | 17 | 595 |
| Pesotum | Champaign County | 524 | 1 | 524 |
| Pesotum (Township) | Champaign County | 810 | 35 | 23 |
| Petersburg | Menard County | 2,214 | 2 | 1107 |
| Petty | Lawrence County | 644 | 57 | 11 |
| Phenix | Henry County | 1,621 | 33 | 49 |
| Philadelphia | Cass County | 198 | 36 | 6 |
| Phillips | White County | 1,158 | 65 | 18 |
| Philo | Champaign County | 1,400 | 1 | 1400 |
| Philo (Township) | Champaign County | 1,872 | 37 | 51 |
| Phoenix | Cook County | 1,908 | 0 | 0 |
| Piasa | Jersey County | 3,183 | 36 | 88 |
| Pickaway | Shelby County | 174 | 30 | 6 |
| Pierce | DeKalb County | 452 | 35 | 13 |
| Pierron | Bond County / Madison County | 544 | 1 | 544 |
| Pigeon Grove | Iroquois County | 1,048 | 36 | 29 |
| Pike | Livingston County | 225 | 36 | 6 |
| Pilot | Kankakee County | 1,972 | 49 | 40 |
| Pilot | Vermilion County | 547 | 62 | 9 |
| Pilot Grove | Hancock County | 259 | 37 | 7 |
| Pilot Knob | Washington County | 532 | 35 | 15 |
| Pin Oak | Madison County | 3,923 | 36 | 109 |
| Pinckneyville | Perry County | 5,372 | 4 | 1343 |
| Pine Creek | Ogle County | 715 | 40 | 18 |
| Pine Rock | Ogle County | 933 | 38 | 25 |
| Pingree Grove | Kane County | 9,874 | 4 | 2469 |
| Piper City | Ford County | 750 | 1 | 750 |
| Pistakee Highlands | McHenry County | 3,318 | 1 | 3318 |
| Pitman | Montgomery County | 479 | 36 | 13 |
| Pittsburg | Williamson County | 551 | 2 | 276 |
| Pittsfield | Pike County | 4,254 | 5 | 851 |
| Pittsfield (Township) | Pike County | 4,141 | 38 | 109 |
| Pixley | Clay County | 564 | 45 | 13 |
| Plainfield | Kendall County / Will County | 44,308 | 24 | 1846 |
| Plainfield (Township) | Will County | 82,237 | 33 | 2492 |
| Plainville | Adams County | 255 | 0 | 0 |
| Plano | Kendall County | 11,665 | 9 | 1296 |
| Plato | Kane County | 6,276 | 33 | 190 |
| Plattville | Kendall County | 256 | 2 | 128 |
| Pleasant | Fulton County | 683 | 37 | 18 |
| Pleasant Grove | Coles County | 1,278 | 42 | 30 |
| Pleasant Hill | Pike County | 925 | 1 | 925 |
| Pleasant Hill (Township) | Pike County | 1,210 | 38 | 32 |
| Pleasant Mound | Bond County | 957 | 38 | 25 |
| Pleasant Plains | Sangamon County | 791 | 1 | 791 |
| Pleasant Ridge | Livingston County | 236 | 29 | 8 |
| Pleasant Vale | Pike County | 549 | 39 | 14 |
| Pleasant Valley | Jo Daviess County | 248 | 37 | 7 |
| Pleasant View | Macon County | 1,382 | 31 | 45 |
| Plum Hill | Washington County | 511 | 38 | 13 |
| Plymouth | Hancock County / McDonough County | 466 | 1 | 466 |
| Pocahontas | Bond County | 731 | 1 | 731 |
| Point Pleasant | Warren County | 152 | 36 | 4 |
| Polk | Macoupin County | 538 | 36 | 15 |
| Polo | Ogle County | 2,171 | 1 | 2171 |
| Pomona | Jackson County | 759 | 50 | 15 |
| Pontiac | Livingston County | 11,253 | 8 | 1407 |
| Pontiac (Township) | Livingston County | 12,326 | 36 | 342 |
| Pontoon Beach | Madison County | 5,641 | 10 | 564 |
| Pontoosuc | Hancock County | 136 | 1 | 136 |
| Pontoosuc (Township) | Hancock County | 384 | 18 | 21 |
| Pope | Fayette County | 211 | 25 | 8 |
| Poplar Grove | Boone County | 5,104 | 8 | 638 |
| Poplar Grove (Township) | Boone County | 5,152 | 24 | 215 |
| Port Barrington | Lake County / McHenry County | 1,488 | 1 | 1488 |
| Port Byron | Rock Island County | 1,607 | 2 | 804 |
| Port Byron (Township) | Rock Island County | 1,405 | 4 | 351 |
| Portland | Whiteside County | 403 | 35 | 12 |
| Posen | Cook County | 5,865 | 1 | 5865 |
| Potomac | Vermilion County | 690 | 0 | 0 |
| Prairie | Crawford County | 553 | 41 | 13 |
| Prairie | Edgar County | 248 | 36 | 7 |
| Prairie | Hancock County | 354 | 33 | 11 |
| Prairie | Shelby County | 1,224 | 54 | 23 |
| Prairie City | McDonough County | 351 | 1 | 351 |
| Prairie City (Township) | McDonough County | 483 | 18 | 27 |
| Prairie Creek | Logan County | 465 | 42 | 11 |
| Prairie Du Long | St. Clair County | 2,188 | 35 | 63 |
| Prairie du Rocher | Randolph County | 558 | 1 | 558 |
| Prairie Green | Iroquois County | 168 | 41 | 4 |
| Prairie Grove | McHenry County | 1,931 | 6 | 322 |
| Prairieton | Christian County | 423 | 37 | 11 |
| Preemption | Mercer County | 1,654 | 37 | 45 |
| Prestbury | Kane County | 1,655 | 1 | 1655 |
| Preston | Richland County | 1,208 | 41 | 29 |
| Preston Heights | Will County | 2,817 | 1 | 2817 |
| Princeton | Bureau County | 7,468 | 8 | 934 |
| Princeton (Township) | Bureau County | 8,802 | 37 | 238 |
| Princeville | Peoria County | 1,672 | 2 | 836 |
| Princeville (Township) | Peoria County | 1,560 | 36 | 43 |
| Prophetstown | Whiteside County | 1,939 | 1 | 1939 |
| Prophetstown (Township) | Whiteside County | 2,455 | 48 | 51 |
| Prospect Heights | Cook County | 15,887 | 4 | 3972 |
| Proviso | Cook County | 146,989 | 30 | 4900 |
| Pulaski | Pulaski County | 175 | 1 | 175 |
| Putman | Fulton County | 1,978 | 34 | 58 |
| Quarry | Jersey County | 1,103 | 21 | 53 |
| Quincy | Adams County | 39,949 | 16 | 2497 |
| Quincy (Township) | Adams County | 39,949 | 16 | 2497 |
| Quiver | Mason County | 829 | 42 | 20 |
| Raccoon | Marion County | 1,470 | 35 | 42 |
| Radnor | Peoria County | 3,486 | 37 | 94 |
| Radom | Washington County | 211 | 1 | 211 |
| Raleigh | Saline County | 329 | 2 | 165 |
| Raleigh (Township) | Saline County | 1,119 | 36 | 31 |
| Ramsey | Fayette County | 1,011 | 1 | 1011 |
| Ramsey (Township) | Fayette County | 1,793 | 54 | 33 |
| Randolph | McLean County | 4,403 | 50 | 88 |
| Rankin | Vermilion County | 513 | 1 | 513 |
| Ransom | LaSalle County | 356 | 1 | 356 |
| Rantoul | Champaign County | 12,493 | 8 | 1562 |
| Rantoul (Township) | Champaign County | 10,832 | 50 | 217 |
| Rapids City | Rock Island County | 967 | 2 | 484 |
| Raritan | Henderson County | 122 | 0 | 0 |
| Raritan (Township) | Henderson County | 255 | 34 | 8 |
| Rawlins | Jo Daviess County | 432 | 12 | 36 |
| Raymond | Champaign County | 404 | 36 | 11 |
| Raymond | Montgomery County | 942 | 1 | 942 |
| Raymond (Township) | Montgomery County | 1,134 | 36 | 32 |
| Reading | Livingston County | 1,929 | 38 | 51 |
| Red Bud | Randolph County | 3,480 | 2 | 1740 |
| Reddick | Kankakee County / Livingston County | 157 | 0 | 0 |
| Redmon | Edgar County | 158 | 0 | 0 |
| Reed | Will County | 7,052 | 17 | 415 |
| Reynolds | Lee County | 280 | 35 | 8 |
| Reynolds | Mercer County / Rock Island County | 507 | 0 | 0 |
| Rice | Jo Daviess County | 321 | 24 | 13 |
| Rich | Cook County | 75,536 | 36 | 2098 |
| Richfield | Adams County | 397 | 38 | 10 |
| Richland | LaSalle County | 360 | 24 | 15 |
| Richland | Marshall County | 406 | 36 | 11 |
| Richland | Shelby County | 728 | 36 | 20 |
| Richland Grove | Mercer County | 2,150 | 36 | 60 |
| Richmond | McHenry County | 1,904 | 4 | 476 |
| Richmond (Township) | McHenry County | 6,630 | 33 | 201 |
| Richton Park | Cook County | 13,292 | 4 | 3323 |
| Richview | Washington County | 243 | 1 | 243 |
| Richview (Township) | Washington County | 319 | 12 | 27 |
| Richwood | Jersey County | 604 | 38 | 16 |
| Richwoods | Peoria County | 5,781 | 3 | 1927 |
| Ricks | Christian County | 1,157 | 36 | 32 |
| Ridge | Shelby County | 420 | 35 | 12 |
| Ridge Farm | Vermilion County | 812 | 3 | 271 |
| Ridgeland | Iroquois County | 362 | 27 | 13 |
| Ridgway | Gallatin County | 747 | 1 | 747 |
| Ridgway (Township) | Gallatin County | 811 | 35 | 23 |
| Ridott | Stephenson County | 151 | 0 | 0 |
| Ridott (Township) | Stephenson County | 1,357 | 54 | 25 |
| Riley | McHenry County | 2,848 | 36 | 79 |
| Ringwood | McHenry County | 813 | 4 | 203 |
| Rio | Knox County | 207 | 0 | 0 |
| Rio (Township) | Knox County | 491 | 36 | 14 |
| River Forest | Cook County | 10,816 | 2 | 5408 |
| River Forest (Township) | Cook County | 10,816 | 2 | 5408 |
| River Grove | Cook County | 9,883 | 2 | 4942 |
| Riverdale | Cook County | 13,077 | 4 | 3269 |
| Riverside | Adams County | 2,043 | 17 | 120 |
| Riverside | Cook County | 8,563 | 2 | 4282 |
| Riverside (Township) | Cook County | 15,040 | 4 | 3760 |
| Riverton | Sangamon County | 3,434 | 2 | 1717 |
| Riverwoods | Lake County | 3,562 | 4 | 891 |
| Rivoli | Mercer County | 1,139 | 35 | 33 |
| Roanoke | Woodford County | 1,990 | 1 | 1990 |
| Roanoke (Township) | Woodford County | 2,470 | 37 | 67 |
| Robbins | Cook County | 5,438 | 1 | 5438 |
| Roberts | Ford County | 329 | 0 | 0 |
| Roberts | Marshall County | 841 | 38 | 22 |
| Robinson | Crawford County | 7,341 | 5 | 1468 |
| Robinson (Township) | Crawford County | 9,368 | 57 | 164 |
| Rochelle | Lee County / Ogle County | 9,052 | 13 | 696 |
| Rochester | Sangamon County | 3,709 | 2 | 1855 |
| Rochester (Township) | Sangamon County | 5,265 | 33 | 160 |
| Rock City | Stephenson County | 283 | 0 | 0 |
| Rock Creek | Hancock County | 322 | 36 | 9 |
| Rock Creek-Lima | Carroll County | 1,816 | 54 | 34 |
| Rock Falls | Whiteside County | 8,740 | 4 | 2185 |
| Rock Grove | Stephenson County | 1,315 | 30 | 44 |
| Rock Island | Rock Island County | 37,176 | 17 | 2187 |
| Rock Island (Township) | Rock Island County | 17,000 | 5 | 3400 |
| Rock Run | Stephenson County | 2,108 | 48 | 44 |
| Rockbridge | Greene County | 157 | 1 | 157 |
| Rockbridge (Township) | Greene County | 1,514 | 48 | 32 |
| Rockdale | Will County | 1,910 | 1 | 1910 |
| Rockford | Ogle County / Winnebago County | 145,609 | 64 | 2275 |
| Rockford (Township) | Winnebago County | 169,980 | 111 | 1531 |
| Rockton | Winnebago County | 7,441 | 6 | 1240 |
| Rockton (Township) | Winnebago County | 15,863 | 36 | 441 |
| Rockvale | Ogle County | 1,686 | 35 | 48 |
| Rockville | Kankakee County | 831 | 36 | 23 |
| Rocky Run-Wilcox | Hancock County | 321 | 57 | 6 |
| Rogers | Ford County | 409 | 24 | 17 |
| Rolling Meadows | Cook County | 23,532 | 6 | 3922 |
| Rome | Jefferson County | 1,618 | 36 | 45 |
| Rome | Peoria County | 1,767 | 2 | 884 |
| Romeoville | Will County | 39,746 | 19 | 2092 |
| Romine | Marion County | 489 | 36 | 14 |
| Roodhouse | Greene County | 1,677 | 1 | 1677 |
| Roodhouse (Township) | Greene County | 2,075 | 40 | 52 |
| Rooks Creek | Livingston County | 535 | 36 | 15 |
| Rosamond | Christian County | 395 | 36 | 11 |
| Roscoe | Winnebago County | 10,510 | 10 | 1051 |
| Roscoe (Township) | Winnebago County | 19,026 | 31 | 614 |
| Rose | Shelby County | 1,799 | 35 | 51 |
| Rosedale | Jersey County | 429 | 30 | 14 |
| Rosefield | Peoria County | 1,174 | 36 | 33 |
| Roselle | Cook County / DuPage County | 22,463 | 5 | 4493 |
| Rosemont | Cook County | 4,066 | 2 | 2033 |
| Roseville | Warren County | 898 | 1 | 898 |
| Roseville (Township) | Warren County | 1,152 | 37 | 31 |
| Rosewood Heights | Madison County | 3,981 | 2 | 1991 |
| Rosiclare | Hardin County | 1,014 | 2 | 507 |
| Ross | Edgar County | 1,459 | 37 | 39 |
| Ross | Vermilion County | 1,491 | 44 | 34 |
| Rossville | Vermilion County | 1,217 | 1 | 1217 |
| Round Grove | Livingston County | 348 | 36 | 10 |
| Round Lake | Lake County | 18,100 | 6 | 3017 |
| Round Lake Beach | Lake County | 27,100 | 5 | 5420 |
| Round Lake Heights | Lake County | 2,645 | 1 | 2645 |
| Round Lake Park | Lake County | 7,747 | 2 | 3874 |
| Rountree | Montgomery County | 226 | 36 | 6 |
| Roxana | Madison County | 1,434 | 7 | 205 |
| Royal | Champaign County | 277 | 0 | 0 |
| Royal Lakes | Macoupin County | 185 | 0 | 0 |
| Royalton | Franklin County | 1,117 | 1 | 1117 |
| Rozetta | Henderson County | 245 | 36 | 7 |
| Rubicon | Greene County | 322 | 36 | 9 |
| Ruma | Randolph County | 304 | 1 | 304 |
| Rural | Rock Island County | 961 | 36 | 27 |
| Rural | Shelby County | 329 | 35 | 9 |
| Rush | Jo Daviess County | 362 | 37 | 10 |
| Rushville | Schuyler County | 2,847 | 2 | 1424 |
| Rushville (Township) | Schuyler County | 2,420 | 36 | 67 |
| Russell | Lawrence County | 399 | 36 | 11 |
| Rutland | Kane County | 25,297 | 36 | 703 |
| Rutland | LaSalle County | 304 | 1 | 304 |
| Rutland (Township) | LaSalle County | 3,477 | 35 | 99 |
| Rutledge | De Witt County | 175 | 24 | 7 |
| Ruyle | Jersey County | 393 | 28 | 14 |
| Sadorus | Champaign County | 390 | 1 | 390 |
| Sadorus (Township) | Champaign County | 920 | 38 | 24 |
| Salem | Carroll County | 327 | 36 | 9 |
| Salem | Knox County | 944 | 36 | 26 |
| Salem | Marion County | 6,971 | 7 | 996 |
| Salem (Township) | Marion County | 8,735 | 35 | 250 |
| Salina | Kankakee County | 1,320 | 37 | 36 |
| Saline | Madison County | 6,259 | 34 | 184 |
| Salt Creek | Mason County | 209 | 36 | 6 |
| Sammons Point | Kankakee County | 259 | 2 | 130 |
| San Jose | Logan County / Mason County | 594 | 0 | 0 |
| Sand Prairie | Tazewell County | 1,344 | 35 | 38 |
| Sand Ridge | Jackson County | 764 | 35 | 22 |
| Sandoval | Marion County | 1,214 | 1 | 1214 |
| Sandoval (Township) | Marion County | 2,212 | 18 | 123 |
| Sandwich | DeKalb County / Kendall County | 7,418 | 5 | 1484 |
| Sandwich (Township) | DeKalb County | 7,699 | 15 | 513 |
| Sangamon | Piatt County | 2,336 | 47 | 50 |
| Sangamon Valley | Cass County | 297 | 40 | 7 |
| Santa Anna | De Witt County | 2,405 | 29 | 83 |
| Santa Fe | Clinton County | 1,157 | 26 | 45 |
| Saratoga | Grundy County | 6,605 | 36 | 183 |
| Saratoga | Marshall County | 259 | 36 | 7 |
| Sargent | Douglas County | 278 | 47 | 6 |
| Sauget | St. Clair County | 168 | 5 | 34 |
| Sauk Village | Cook County / Will County | 10,246 | 4 | 2562 |
| Saunemin | Livingston County | 404 | 0 | 0 |
| Saunemin (Township) | Livingston County | 628 | 43 | 15 |
| Savanna | Carroll County | 2,797 | 3 | 932 |
| Savanna (Township) | Carroll County | 3,435 | 13 | 264 |
| Savoy | Champaign County | 8,401 | 3 | 2800 |
| Sawyerville | Macoupin County | 266 | 1 | 266 |
| Saybrook | McLean County | 668 | 1 | 668 |
| Scales Mound | Jo Daviess County | 356 | 1 | 356 |
| Scales Mound (Township) | Jo Daviess County | 580 | 19 | 31 |
| Schaumburg | Cook County / DuPage County | 72,887 | 19 | 3836 |
| Schaumburg (Township) | Cook County | 128,775 | 31 | 4154 |
| Schiller Park | Cook County | 11,403 | 3 | 3801 |
| Schram City | Montgomery County | 550 | 1 | 550 |
| Sciota (Township) | McDonough County | 487 | 38 | 13 |
| Scotland | McDonough County | 402 | 36 | 11 |
| Scott | Champaign County | 1,088 | 36 | 30 |
| Scott | Ogle County | 3,118 | 36 | 87 |
| Scott AFB | St. Clair County | 2,913 | 4 | 728 |
| Scottville | Macoupin County | 110 | 1 | 110 |
| Scottville (Township) | Macoupin County | 314 | 37 | 8 |
| Seaton | Mercer County | 202 | 2 | 101 |
| Seatonville | Bureau County | 296 | 0 | 0 |
| Secor | Woodford County | 355 | 0 | 0 |
| Sefton | Fayette County | 578 | 50 | 12 |
| Selby | Bureau County | 2,352 | 36 | 65 |
| Seminary | Fayette County | 498 | 45 | 11 |
| Senachwine | Putnam County | 736 | 32 | 23 |
| Seneca | Grundy County / LaSalle County | 2,251 | 6 | 375 |
| Seneca | McHenry County | 2,877 | 36 | 80 |
| Serena | LaSalle County | 1,090 | 37 | 29 |
| Sesser | Franklin County | 1,860 | 1 | 1860 |
| Seven Hickory | Coles County | 278 | 52 | 5 |
| Seward | Kendall County | 4,804 | 35 | 137 |
| Seward | Winnebago County | 876 | 36 | 24 |
| Seymour | Champaign County | 312 | 0 | 0 |
| Shabbona | DeKalb County | 920 | 1 | 920 |
| Shabbona (Township) | DeKalb County | 1,445 | 35 | 41 |
| Shafter | Fayette County | 469 | 36 | 13 |
| Shannon | Carroll County | 688 | 0 | 0 |
| Sharon | Fayette County | 2,280 | 25 | 91 |
| Shawnee | Gallatin County | 197 | 23 | 9 |
| Shawneetown | Gallatin County | 1,077 | 1 | 1077 |
| Shaws Point | Macoupin County | 505 | 34 | 15 |
| Sheffield | Bureau County | 863 | 1 | 863 |
| Shelbyville | Shelby County | 4,495 | 4 | 1124 |
| Shelbyville (Township) | Shelby County | 4,552 | 34 | 134 |
| Sheldon | Iroquois County | 949 | 1 | 949 |
| Sheldon (Township) | Iroquois County | 1,229 | 40 | 31 |
| Sheridan | LaSalle County | 2,520 | 2 | 1260 |
| Sheridan | Logan County | 451 | 36 | 13 |
| Sherman | Mason County | 475 | 36 | 13 |
| Sherman | Sangamon County | 4,679 | 3 | 1560 |
| Sherrard | Mercer County | 594 | 1 | 594 |
| Shields | Lake County | 36,427 | 18 | 2024 |
| Shiloh | Edgar County | 147 | 58 | 3 |
| Shiloh | Jefferson County | 6,426 | 36 | 179 |
| Shiloh | St. Clair County | 13,586 | 11 | 1235 |
| Shiloh Valley | St. Clair County | 11,817 | 32 | 369 |
| Shipman | Macoupin County | 587 | 1 | 587 |
| Shipman (Township) | Macoupin County | 1,345 | 36 | 37 |
| Shirland | Winnebago County | 951 | 19 | 50 |
| Shoal Creek | Bond County | 1,665 | 58 | 29 |
| Shorewood | Will County | 17,509 | 8 | 2189 |
| Shumway | Effingham County | 195 | 0 | 0 |
| Sibley | Ford County | 252 | 0 | 0 |
| Sidell | Vermilion County | 563 | 1 | 563 |
| Sidell (Township) | Vermilion County | 983 | 43 | 23 |
| Sidney | Champaign County | 1,191 | 1 | 1191 |
| Sidney (Township) | Champaign County | 1,659 | 36 | 46 |
| Sigel | Shelby County | 355 | 0 | 0 |
| Sigel (Township) | Shelby County | 796 | 24 | 33 |
| Silver Creek | Stephenson County | 672 | 35 | 19 |
| Silvis | Rock Island County | 7,475 | 4 | 1869 |
| Sims | Wayne County | 240 | 1 | 240 |
| Six Mile | Franklin County | 3,738 | 36 | 104 |
| Skokie | Cook County | 62,700 | 10 | 6270 |
| Sleepy Hollow | Kane County | 3,244 | 2 | 1622 |
| Smallwood | Jasper County | 407 | 42 | 10 |
| Smithboro | Bond County | 165 | 1 | 165 |
| Smithfield | Fulton County | 221 | 0 | 0 |
| Smithton | St. Clair County | 3,816 | 4 | 954 |
| Smithton (Township) | St. Clair County | 4,257 | 32 | 133 |
| Somer | Champaign County | 1,033 | 33 | 31 |
| Somerset | Jackson County | 3,957 | 37 | 107 |
| Somonauk | DeKalb County / LaSalle County | 1,871 | 2 | 936 |
| Somonauk (Township) | DeKalb County | 2,097 | 19 | 110 |
| Songer | Clay County | 322 | 37 | 9 |
| Sonora | Hancock County | 457 | 36 | 13 |
| Sorento | Bond County | 469 | 1 | 469 |
| South Barrington | Cook County | 4,996 | 7 | 714 |
| South Beloit | Winnebago County | 7,624 | 6 | 1271 |
| South Chicago Heights | Cook County | 4,003 | 2 | 2002 |
| South Crouch | Hamilton County | 254 | 25 | 10 |
| South Dixon | Lee County | 881 | 30 | 29 |
| South Elgin | Kane County | 24,755 | 7 | 3536 |
| South Flannigan | Hamilton County | 117 | 18 | 7 |
| South Fork | Christian County | 2,568 | 62 | 41 |
| South Grove | DeKalb County | 510 | 34 | 15 |
| South Holland | Cook County | 21,296 | 7 | 3042 |
| South Homer | Champaign County | 1,560 | 28 | 56 |
| South Hurricane | Fayette County | 297 | 27 | 11 |
| South Jacksonville | Morgan County | 3,102 | 2 | 1551 |
| South Litchfield | Montgomery County | 3,213 | 37 | 87 |
| South Macon | Macon County | 1,405 | 34 | 41 |
| South Moline | Rock Island County | 35,067 | 16 | 2192 |
| South Muddy | Jasper County | 337 | 36 | 9 |
| South Ottawa | LaSalle County | 8,021 | 20 | 401 |
| South Otter | Macoupin County | 439 | 36 | 12 |
| South Palmyra | Macoupin County | 707 | 36 | 20 |
| South Pekin | Tazewell County | 1,093 | 1 | 1093 |
| South Rock Island | Rock Island County | 17,479 | 7 | 2497 |
| South Ross | Vermilion County | 990 | 54 | 18 |
| South Roxana | Madison County | 1,991 | 2 | 996 |
| South Twigg | Hamilton County | 130 | 18 | 7 |
| South Wheatland | Macon County | 3,917 | 28 | 140 |
| South Wilmington | Grundy County | 644 | 0 | 0 |
| Southern View | Sangamon County | 1,570 | 1 | 1570 |
| Sparland | Marshall County | 367 | 1 | 367 |
| Sparta | Knox County | 1,096 | 36 | 30 |
| Sparta | Randolph County | 4,273 | 11 | 388 |
| Spaulding | Sangamon County | 849 | 1 | 849 |
| Spillertown | Williamson County | 196 | 0 | 0 |
| Spring | Boone County | 873 | 36 | 24 |
| Spring Bay | Woodford County | 462 | 1 | 462 |
| Spring Bay (Township) | Woodford County | 2,672 | 10 | 267 |
| Spring Creek | Pike County | 567 | 37 | 15 |
| Spring Garden | Jefferson County | 3,221 | 37 | 87 |
| Spring Grove | McHenry County | 5,706 | 9 | 634 |
| Spring Grove | Warren County | 973 | 37 | 26 |
| Spring Lake | Tazewell County | 1,823 | 62 | 29 |
| Spring Point | Cumberland County | 1,270 | 56 | 23 |
| Spring Valley | Bureau County | 5,125 | 7 | 732 |
| Springerton | White County | 102 | 0 | 0 |
| Springfield | Sangamon County | 114,230 | 61 | 1873 |
| Springfield (Township) | Sangamon County | 5,519 | 13 | 425 |
| Squaw Grove | DeKalb County | 2,782 | 35 | 79 |
| St. Albans | Hancock County | 348 | 36 | 10 |
| St. Anne | Kankakee County | 1,193 | 1 | 1193 |
| St. Anne (Township) | Kankakee County | 2,058 | 30 | 69 |
| St. Augustine | Knox County | 112 | 1 | 112 |
| St. Charles | DuPage County / Kane County | 32,887 | 14 | 2349 |
| St. Charles (Township) | Kane County | 52,333 | 35 | 1495 |
| St. Clair | St. Clair County | 35,099 | 20 | 1755 |
| St. David | Fulton County | 527 | 0 | 0 |
| St. Elmo | Fayette County | 1,403 | 1 | 1403 |
| St. Francis | Effingham County | 1,181 | 32 | 37 |
| St. Francisville | Lawrence County | 622 | 1 | 622 |
| St. Jacob | Madison County | 1,319 | 1 | 1319 |
| St. Jacob (Township) | Madison County | 2,727 | 36 | 76 |
| St. Johns | Perry County | 208 | 1 | 208 |
| St. Joseph | Champaign County | 3,860 | 2 | 1930 |
| St. Joseph (Township) | Champaign County | 5,701 | 36 | 158 |
| St. Libory | St. Clair County | 603 | 1 | 603 |
| St. Mary | Hancock County | 593 | 37 | 16 |
| St. Peter | Fayette County | 341 | 1 | 341 |
| St. Rose | Clinton County | 407 | 1 | 407 |
| St. Rose (Township) | Clinton County | 1,437 | 38 | 38 |
| Standard | Putnam County | 203 | 1 | 203 |
| Standard City | Macoupin County | 145 | 1 | 145 |
| Stanford | Clay County | 562 | 53 | 11 |
| Stanford | McLean County | 598 | 1 | 598 |
| Stanton | Champaign County | 490 | 35 | 14 |
| Staunton | Macoupin County | 4,954 | 4 | 1239 |
| Staunton (Township) | Macoupin County | 5,492 | 18 | 305 |
| Ste. Marie | Jasper County | 238 | 1 | 238 |
| Ste. Marie (Township) | Jasper County | 542 | 43 | 13 |
| Steeleville | Randolph County | 1,925 | 2 | 963 |
| Steger | Cook County / Will County | 9,221 | 3 | 3074 |
| Sterling | Whiteside County | 14,463 | 6 | 2411 |
| Sterling (Township) | Whiteside County | 16,953 | 23 | 737 |
| Steuben | Marshall County | 1,085 | 29 | 37 |
| Stevenson | Marion County | 1,238 | 37 | 33 |
| Steward | Lee County | 241 | 0 | 0 |
| Stewardson | Shelby County | 721 | 1 | 721 |
| Stickney | Cook County | 6,566 | 2 | 3283 |
| Stickney (Township) | Cook County | 39,761 | 12 | 3313 |
| Stillman Valley | Ogle County | 1,053 | 0 | 0 |
| Stites | St. Clair County | 698 | 2 | 349 |
| Stockland | Iroquois County | 224 | 54 | 4 |
| Stockton | Jo Daviess County | 1,712 | 2 | 856 |
| Stockton (Township) | Jo Daviess County | 2,263 | 37 | 61 |
| Stone Park | Cook County | 4,826 | 0 | 0 |
| Stonefort | Saline County / Williamson County | 285 | 1 | 285 |
| Stonefort (Township) | Saline County | 385 | 18 | 21 |
| Stonington | Christian County | 846 | 0 | 0 |
| Stonington (Township) | Christian County | 1,032 | 36 | 29 |
| Stookey | St. Clair County | 9,225 | 27 | 342 |
| Stoy | Crawford County | 115 | 1 | 115 |
| Strasburg | Shelby County | 439 | 1 | 439 |
| Stratton | Edgar County | 438 | 25 | 18 |
| Streamwood | Cook County | 39,228 | 8 | 4904 |
| Streator | LaSalle County / Livingston County | 13,113 | 7 | 1873 |
| Stronghurst | Henderson County | 789 | 1 | 789 |
| Stronghurst (Township) | Henderson County | 1,002 | 36 | 28 |
| Sublette | Lee County | 421 | 0 | 0 |
| Sublette (Township) | Lee County | 728 | 37 | 20 |
| Suez | Mercer County | 554 | 37 | 15 |
| Sugar Creek | Clinton County | 6,258 | 37 | 169 |
| Sugar Grove | Kane County | 9,888 | 12 | 824 |
| Sugar Grove (Township) | Kane County | 20,780 | 35 | 594 |
| Sugar Loaf | St. Clair County | 6,843 | 31 | 221 |
| Sullivan | Livingston County | 670 | 41 | 16 |
| Sullivan | Moultrie County | 4,433 | 3 | 1478 |
| Sullivan (Township) | Moultrie County | 6,258 | 59 | 106 |
| Sullivant | Ford County | 462 | 47 | 10 |
| Summerfield | St. Clair County | 395 | 0 | 0 |
| Summit | Cook County | 11,116 | 2 | 5558 |
| Summit | Effingham County | 3,475 | 34 | 102 |
| Sumner | Kankakee County | 868 | 37 | 23 |
| Sumner | Lawrence County | 2,980 | 1 | 2980 |
| Sumner | Warren County | 544 | 37 | 15 |
| Sumpter | Cumberland County | 1,931 | 46 | 42 |
| Sun River Terrace | Kankakee County | 496 | 1 | 496 |
| Sunbury | Livingston County | 216 | 36 | 6 |
| Swan | Warren County | 256 | 35 | 7 |
| Swansea | St. Clair County | 13,350 | 6 | 2225 |
| Sycamore | DeKalb County | 18,322 | 10 | 1832 |
| Sycamore (Township) | DeKalb County | 14,901 | 34 | 438 |
| Symmes | Edgar County | 1,060 | 42 | 25 |
| Table Grove | Fulton County | 383 | 0 | 0 |
| Talkington | Sangamon County | 181 | 38 | 5 |
| Tallula | Menard County | 474 | 1 | 474 |
| Tamalco | Bond County | 528 | 37 | 14 |
| Tamaroa | Perry County | 597 | 1 | 597 |
| Tamms | Alexander County | 472 | 2 | 236 |
| Tampico | Whiteside County | 729 | 0 | 0 |
| Tampico (Township) | Whiteside County | 1,068 | 36 | 30 |
| Tate | Saline County | 278 | 18 | 15 |
| Taylor | Ogle County | 911 | 15 | 61 |
| Taylor Springs | Montgomery County | 659 | 1 | 659 |
| Taylorville | Christian County | 10,360 | 10 | 1036 |
| Taylorville (Township) | Christian County | 11,503 | 42 | 274 |
| Tennessee | McDonough County | 108 | 0 | 0 |
| Tennessee (Township) | McDonough County | 314 | 29 | 11 |
| Terre Haute | Henderson County | 240 | 36 | 7 |
| Teutopolis | Effingham County | 1,642 | 2 | 821 |
| Teutopolis (Township) | Effingham County | 2,682 | 17 | 158 |
| Texas | De Witt County | 1,185 | 36 | 33 |
| Thawville | Iroquois County | 244 | 0 | 0 |
| Thayer | Sangamon County | 655 | 1 | 655 |
| The Galena Territory | Jo Daviess County | 1,296 | 11 | 118 |
| Thebes | Alexander County | 321 | 2 | 161 |
| Third Lake | Lake County | 1,146 | 1 | 1146 |
| Thomasboro | Champaign County | 1,084 | 1 | 1084 |
| Thompson | Jo Daviess County | 799 | 36 | 22 |
| Thompsonville | Franklin County | 526 | 2 | 263 |
| Thomson | Carroll County | 551 | 2 | 276 |
| Thornton | Cook County | 2,401 | 2 | 1201 |
| Thornton (Township) | Cook County | 164,035 | 47 | 3490 |
| Tilden | Randolph County | 881 | 1 | 881 |
| Tilton | Vermilion County | 2,686 | 3 | 895 |
| Timber | Peoria County | 2,385 | 36 | 66 |
| Timberlane | Boone County | 946 | 2 | 473 |
| Tinley Park | Cook County / Will County | 55,773 | 16 | 3486 |
| Tiskilwa | Bureau County | 766 | 1 | 766 |
| Todds Point | Shelby County | 417 | 19 | 22 |
| Toledo | Cumberland County | 1,190 | 1 | 1190 |
| Tolono | Champaign County | 3,392 | 2 | 1696 |
| Tolono (Township) | Champaign County | 5,405 | 36 | 150 |
| Toluca | Marshall County | 1,269 | 1 | 1269 |
| Tompkins | Warren County | 873 | 37 | 24 |
| Tonica | LaSalle County | 715 | 1 | 715 |
| Tonti | Marion County | 955 | 35 | 27 |
| Toulon | Stark County | 1,161 | 1 | 1161 |
| Toulon (Township) | Stark County | 2,166 | 35 | 62 |
| Tovey | Christian County | 476 | 0 | 0 |
| Towanda | McLean County | 462 | 1 | 462 |
| Towanda (Township) | McLean County | 1,210 | 35 | 35 |
| Tower Hill | Shelby County | 588 | 1 | 588 |
| Tower Hill (Township) | Shelby County | 1,190 | 35 | 34 |
| Tower Lakes | Lake County | 1,226 | 1 | 1226 |
| Tremont | Tazewell County | 2,120 | 1 | 2120 |
| Tremont (Township) | Tazewell County | 2,524 | 35 | 72 |
| Trenton | Clinton County | 2,590 | 2 | 1295 |
| Trivoli | Peoria County | 984 | 36 | 27 |
| Trout Valley | McHenry County | 513 | 0 | 0 |
| Troy | Madison County | 10,375 | 6 | 1729 |
| Troy | Will County | 47,768 | 35 | 1365 |
| Troy Grove | LaSalle County | 238 | 1 | 238 |
| Troy Grove (Township) | LaSalle County | 1,291 | 36 | 36 |
| Truro | Knox County | 792 | 36 | 22 |
| Tunbridge | De Witt County | 728 | 37 | 20 |
| Tuscola | Douglas County | 4,363 | 3 | 1454 |
| Tuscola (Township) | Douglas County | 5,137 | 63 | 82 |
| Twigg | Hamilton County | 554 | 36 | 15 |
| Twin Grove | McLean County | 1,819 | 4 | 455 |
| Tyrone | Franklin County | 4,869 | 35 | 139 |
| Ullin | Pulaski County | 400 | 3 | 133 |
| Union | Cumberland County | 667 | 53 | 13 |
| Union | Effingham County | 728 | 36 | 20 |
| Union | Fulton County | 912 | 37 | 25 |
| Union | Livingston County | 225 | 35 | 6 |
| Union | McHenry County | 553 | 1 | 553 |
| Union Grove | Whiteside County | 1,176 | 35 | 34 |
| Unity | Piatt County | 1,346 | 48 | 28 |
| University Park | Cook County / Will County | 6,887 | 11 | 626 |
| Urbana | Champaign County | 42,214 | 12 | 3518 |
| Urbana (Township) | Champaign County | 7,151 | 24 | 298 |
| Ursa | Adams County | 605 | 1 | 605 |
| Ursa (Township) | Adams County | 1,033 | 57 | 18 |
| Ustick | Whiteside County | 586 | 35 | 17 |
| Utica | LaSalle County | 2,002 | 18 | 111 |
| Valier | Franklin County | 637 | 1 | 637 |
| Valley | Stark County | 260 | 37 | 7 |
| Valmeyer | Monroe County | 1,248 | 3 | 416 |
| Vance | Vermilion County | 982 | 40 | 25 |
| Vandalia | Fayette County | 6,684 | 8 | 836 |
| Vandalia (Township) | Fayette County | 6,382 | 35 | 182 |
| Varna | Marshall County | 347 | 0 | 0 |
| Venedy | Washington County | 133 | 0 | 0 |
| Venedy (Township) | Washington County | 388 | 22 | 18 |
| Venetian Village | Lake County | 3,135 | 2 | 1568 |
| Venice | Madison County | 1,858 | 2 | 929 |
| Venice (Township) | Madison County | 5,516 | 11 | 501 |
| Vergennes | Jackson County | 281 | 0 | 0 |
| Vergennes (Township) | Jackson County | 724 | 37 | 20 |
| Vermilion | Edgar County | 202 | 1 | 202 |
| Vermillion | LaSalle County | 372 | 23 | 16 |
| Vermont | Fulton County | 640 | 1 | 640 |
| Vermont (Township) | Fulton County | 931 | 37 | 25 |
| Vernon | Lake County | 67,674 | 36 | 1880 |
| Vernon | Marion County | 118 | 1 | 118 |
| Vernon Hills | Lake County | 26,521 | 8 | 3315 |
| Verona | Grundy County | 206 | 0 | 0 |
| Versailles | Brown County | 458 | 1 | 458 |
| Versailles (Township) | Brown County | 718 | 36 | 20 |
| Victor | DeKalb County | 300 | 33 | 9 |
| Victoria | Knox County | 289 | 0 | 0 |
| Victoria (Township) | Knox County | 354 | 35 | 10 |
| Vienna | Grundy County | 666 | 36 | 19 |
| Vienna | Johnson County | 1,440 | 3 | 480 |
| Villa Grove | Douglas County | 2,418 | 2 | 1209 |
| Villa Park | DuPage County | 21,483 | 5 | 4297 |
| Vinegar Hill | Jo Daviess County | 344 | 14 | 25 |
| Viola | Lee County | 330 | 35 | 9 |
| Viola | Mercer County | 888 | 1 | 888 |
| Virden | Macoupin County / Sangamon County | 3,330 | 2 | 1665 |
| Virden (Township) | Macoupin County | 3,462 | 18 | 192 |
| Virgil | Kane County | 327 | 2 | 164 |
| Virgil (Township) | Kane County | 1,950 | 35 | 56 |
| Virginia | Cass County | 1,435 | 1 | 1435 |
| Virginia (Township) | Cass County | 1,626 | 36 | 45 |
| Volo | Lake County | 5,813 | 4 | 1453 |
| Wabash | Clark County | 2,130 | 73 | 29 |
| Waddams | Stephenson County | 756 | 36 | 21 |
| Wade | Clinton County | 1,692 | 29 | 58 |
| Wade | Jasper County | 4,426 | 74 | 60 |
| Wadsworth | Lake County | 3,651 | 10 | 365 |
| Waggoner | Montgomery County | 253 | 0 | 0 |
| Waldo | Livingston County | 241 | 36 | 7 |
| Walker | Hancock County | 306 | 38 | 8 |
| Walkerville | Greene County | 214 | 39 | 5 |
| Wall | Ford County | 190 | 37 | 5 |
| Wallace | LaSalle County | 469 | 28 | 17 |
| Walnut | Bureau County | 1,306 | 1 | 1306 |
| Walnut (Township) | Bureau County | 1,619 | 37 | 44 |
| Walnut Grove | Knox County | 724 | 36 | 20 |
| Walnut Grove | McDonough County | 431 | 36 | 12 |
| Walnut Hill | Marion County | 104 | 0 | 0 |
| Walshville (Township) | Montgomery County | 332 | 37 | 9 |
| Waltham | LaSalle County | 421 | 37 | 11 |
| Waltonville | Jefferson County | 432 | 1 | 432 |
| Wamac | Clinton County / Marion County / Washington County | 1,123 | 1 | 1123 |
| Wapella | De Witt County | 522 | 1 | 522 |
| Wapella (Township) | De Witt County | 890 | 29 | 31 |
| Wards Grove | Jo Daviess County | 212 | 18 | 12 |
| Warren | Jo Daviess County | 1,304 | 1 | 1304 |
| Warren | Lake County | 63,263 | 36 | 1757 |
| Warren (Township) | Jo Daviess County | 1,468 | 20 | 73 |
| Warrensburg | Macon County | 1,126 | 1 | 1126 |
| Warrenville | DuPage County | 13,174 | 5 | 2635 |
| Warsaw | Hancock County | 1,480 | 7 | 211 |
| Warsaw (Township) | Hancock County | 1,480 | 7 | 211 |
| Washburn | Marshall County / Woodford County | 1,082 | 1 | 1082 |
| Washington | Carroll County | 336 | 35 | 10 |
| Washington | Tazewell County | 16,516 | 8 | 2065 |
| Washington | Will County | 6,304 | 45 | 140 |
| Washington (Township) | Tazewell County | 24,606 | 55 | 447 |
| Washington Park | St. Clair County | 3,865 | 3 | 1288 |
| Wataga | Knox County | 786 | 1 | 786 |
| Waterford | Fulton County | 178 | 21 | 8 |
| Waterloo | Monroe County | 10,578 | 8 | 1322 |
| Waterman | DeKalb County | 1,500 | 1 | 1500 |
| Watseka | Iroquois County | 4,767 | 3 | 1589 |
| Watson | Effingham County | 732 | 1 | 732 |
| Watson (Township) | Effingham County | 3,133 | 36 | 87 |
| Wauconda | Lake County | 13,504 | 5 | 2701 |
| Wauconda (Township) | Lake County | 23,814 | 23 | 1035 |
| Waukegan | Lake County | 86,075 | 24 | 3586 |
| Waukegan (Township) | Lake County | 87,714 | 21 | 4177 |
| Wauponsee | Grundy County | 2,352 | 27 | 87 |
| Waverly | Morgan County | 1,194 | 1 | 1194 |
| Wayne | DuPage County / Kane County | 2,429 | 6 | 405 |
| Wayne (Township) | DuPage County | 65,911 | 35 | 1883 |
| Wayne City | Wayne County | 993 | 2 | 497 |
| Waynesville | De Witt County | 410 | 0 | 0 |
| Waynesville (Township) | De Witt County | 679 | 24 | 28 |
| Webber | Jefferson County | 2,262 | 37 | 61 |
| Weldon | De Witt County | 412 | 0 | 0 |
| Weller | Henry County | 407 | 34 | 12 |
| Wellington | Iroquois County | 216 | 0 | 0 |
| Wenona | LaSalle County / Marshall County | 938 | 1 | 938 |
| Wesley | Will County | 2,183 | 28 | 78 |
| West | Effingham County | 452 | 37 | 12 |
| West | McLean County | 214 | 48 | 4 |
| West Brooklyn | Lee County | 133 | 0 | 0 |
| West Chicago | DuPage County | 26,816 | 15 | 1788 |
| West City | Franklin County | 638 | 2 | 319 |
| West Deerfield | Lake County | 31,456 | 18 | 1748 |
| West Dundee | Kane County | 8,113 | 4 | 2028 |
| West Frankfort | Franklin County | 7,823 | 5 | 1565 |
| West Galena | Jo Daviess County | 3,076 | 10 | 308 |
| West Jersey | Stark County | 252 | 37 | 7 |
| West Lincoln | Logan County | 7,258 | 38 | 191 |
| West Peoria | Peoria County | 4,455 | 2 | 2228 |
| West Peoria (Township) | Peoria County | 4,445 | 3 | 1482 |
| West Point | Hancock County | 163 | 0 | 0 |
| West Point | Stephenson County | 3,141 | 36 | 87 |
| West Salem | Edwards County | 851 | 2 | 426 |
| West Union | Clark County | 430 | 2 | 215 |
| Westchester | Cook County | 16,117 | 4 | 4029 |
| Western | Henry County | 2,950 | 35 | 84 |
| Western Mound | Macoupin County | 257 | 35 | 7 |
| Western Springs | Cook County | 13,359 | 3 | 4453 |
| Westfield | Bureau County | 874 | 35 | 25 |
| Westfield | Clark County | 558 | 1 | 558 |
| Westfield (Township) | Clark County | 668 | 18 | 37 |
| Westmont | DuPage County | 24,443 | 5 | 4889 |
| Westville | Vermilion County | 2,945 | 2 | 1473 |
| Wethersfield | Henry County | 3,778 | 36 | 105 |
| Wheatfield | Clinton County | 481 | 35 | 14 |
| Wheatland | Bureau County | 126 | 18 | 7 |
| Wheatland | Fayette County | 457 | 37 | 12 |
| Wheatland | Will County | 85,216 | 35 | 2435 |
| Wheaton | DuPage County | 52,745 | 11 | 4795 |
| Wheeler | Jasper County | 146 | 1 | 146 |
| Wheeling | Cook County / Lake County | 38,646 | 9 | 4294 |
| Wheeling (Township) | Cook County | 153,145 | 36 | 4254 |
| White City | Macoupin County | 230 | 1 | 230 |
| White Hall | Greene County | 2,329 | 3 | 776 |
| White Hall (Township) | Greene County | 2,827 | 42 | 67 |
| White Heath | Piatt County | 254 | 0 | 0 |
| White Oak | McLean County | 901 | 17 | 53 |
| White Rock | Ogle County | 695 | 36 | 19 |
| Whiteash | Williamson County | 271 | 1 | 271 |
| Whitefield | Marshall County | 275 | 37 | 7 |
| Whitley | Moultrie County | 632 | 37 | 17 |
| Whitmore | Macon County | 4,216 | 36 | 117 |
| Wilberton | Fayette County | 488 | 36 | 14 |
| Will | Will County | 1,797 | 36 | 50 |
| Williams | Sangamon County | 3,509 | 43 | 82 |
| Williamsfield | Knox County | 545 | 1 | 545 |
| Williamson | Madison County | 215 | 2 | 108 |
| Williamsville | Sangamon County | 1,485 | 1 | 1485 |
| Willisville | Perry County | 587 | 0 | 0 |
| Willow Branch | Piatt County | 822 | 67 | 12 |
| Willow Creek | Lee County | 643 | 35 | 18 |
| Willow Hill | Jasper County | 228 | 1 | 228 |
| Willow Hill (Township) | Jasper County | 631 | 34 | 19 |
| Willow Springs | Cook County | 5,621 | 4 | 1405 |
| Willowbrook | DuPage County | 8,579 | 3 | 2860 |
| Willowbrook | Will County | 2,041 | 3 | 680 |
| Wilmette | Cook County | 27,089 | 5 | 5418 |
| Wilmington | Greene County | 132 | 1 | 132 |
| Wilmington | Will County | 5,653 | 14 | 404 |
| Wilmington (Township) | Will County | 6,075 | 33 | 184 |
| Wilson | De Witt County | 136 | 24 | 6 |
| Wilsonville | Macoupin County | 553 | 1 | 553 |
| Wilton | Will County | 821 | 36 | 23 |
| Winchester | Scott County | 1,467 | 1 | 1467 |
| Windsor | Mercer County | 772 | 0 | 0 |
| Windsor | Shelby County | 1,151 | 1 | 1151 |
| Windsor (Township) | Shelby County | 1,429 | 29 | 49 |
| Winfield | DuPage County | 9,636 | 3 | 3212 |
| Winfield (Township) | DuPage County | 46,248 | 35 | 1321 |
| Winnebago | Winnebago County | 2,991 | 2 | 1496 |
| Winnebago (Township) | Winnebago County | 5,060 | 33 | 153 |
| Winnetka | Cook County | 12,316 | 4 | 3079 |
| Winslow | Stephenson County | 312 | 0 | 0 |
| Winslow (Township) | Stephenson County | 589 | 29 | 20 |
| Winthrop Harbor | Lake County | 6,618 | 5 | 1324 |
| Witt | Montgomery County | 843 | 1 | 843 |
| Witt (Township) | Montgomery County | 1,085 | 37 | 29 |
| Wonder Lake | McHenry County | 3,882 | 5 | 776 |
| Wood Dale | DuPage County | 13,607 | 5 | 2721 |
| Wood River | Madison County | 10,051 | 7 | 1436 |
| Wood River (Township) | Madison County | 30,180 | 25 | 1207 |
| Woodbine | Jo Daviess County | 551 | 37 | 15 |
| Woodbury | Cumberland County | 588 | 23 | 26 |
| Woodhull | Henry County | 783 | 1 | 783 |
| Woodland | Carroll County | 264 | 37 | 7 |
| Woodland | Fulton County | 399 | 38 | 11 |
| Woodland | Iroquois County | 297 | 0 | 0 |
| Woodlawn | Jefferson County | 682 | 1 | 682 |
| Woodridge | Cook County / DuPage County / Will County | 33,432 | 10 | 3343 |
| Woodside | Sangamon County | 10,585 | 12 | 882 |
| Woodson | Morgan County | 485 | 0 | 0 |
| Woodstock | McHenry County | 25,240 | 13 | 1942 |
| Woodstock | Schuyler County | 345 | 37 | 9 |
| Woodville | Greene County | 222 | 47 | 5 |
| Woosung | Ogle County | 367 | 18 | 20 |
| Worden | Madison County | 1,041 | 1 | 1041 |
| Worth | Cook County | 10,466 | 2 | 5233 |
| Worth | Woodford County | 8,799 | 36 | 244 |
| Worth (Township) | Cook County | 148,258 | 32 | 4633 |
| Wrights | Greene County | 289 | 36 | 8 |
| Wyanet | Bureau County | 923 | 1 | 923 |
| Wyanet (Township) | Bureau County | 1,274 | 36 | 35 |
| Wyoming | Lee County | 1,275 | 36 | 35 |
| Wyoming | Stark County | 1,273 | 1 | 1273 |
| Wysox | Carroll County | 1,264 | 38 | 33 |
| Wythe | Hancock County | 229 | 38 | 6 |
| Xenia | Clay County | 368 | 0 | 0 |
| Xenia (Township) | Clay County | 634 | 19 | 33 |
| Yates | McLean County | 285 | 37 | 8 |
| Yates City | Knox County | 652 | 0 | 0 |
| Yellowhead | Kankakee County | 2,536 | 44 | 58 |
| York | Carroll County | 1,637 | 48 | 34 |
| York | Clark County | 521 | 31 | 17 |
| York | DuPage County | 125,629 | 35 | 3589 |
| Yorktown | Henry County | 413 | 36 | 11 |
| Yorkville | Kendall County | 20,613 | 20 | 1031 |
| Young America | Edgar County | 663 | 55 | 12 |
| Young Hickory | Fulton County | 590 | 24 | 25 |
| Zanesville | Montgomery County | 456 | 37 | 12 |
| Zeigler | Franklin County | 1,712 | 1 | 1712 |
| Zion | Lake County | 23,487 | 10 | 2349 |
| Zion (Township) | Lake County | 23,487 | 10 | 2349 |
| Zuma | Rock Island County | 731 | 24 | 30 |
| Totals: | 20,722,526 |
