| Community | Population | Elevation |
|---|---|---|
| Abingdon | 3,269 | 751 ft. |
| Alto Pass | 382 | 748 ft. |
| Anna | 5,025 | 629 ft. |
| Arlington Heights | 73,399 | 702 ft. |
| Ashton | 1,166 | 823 ft. |
| Aurora | 171,782 | 679 ft. |
| Belleville | 41,097 | 515 ft. |
| Benton | 6,957 | 472 ft. |
| Bloomington | 73,026 | 797 ft. |
| Bolingbrook | 70,823 | 702 ft. |
| Carbondale | 26,231 | 413 ft. |
| Carlyle | 3,378 | 456 ft. |
| Carrier Mills | 1,832 | 387 ft. |
| Carterville | 5,441 | 452 ft. |
| Centralia | 13,569 | 492 ft. |
| Champaign | 79,389 | 738 ft. |
| Charleston | 21,715 | 672 ft. |
| Chicago | 2,853,114 | 587 ft. |
| Chillicothe | 5,901 | 501 ft. |
| Cicero | 80,414 | 603 ft. |
| Cobden | 1,098 | 587 ft. |
| Collinsville | 25,960 | 561 ft. |
| Creston | 623 | 905 ft. |
| Cutler | 528 | 498 ft. |
| Dalzell | 717 | 633 ft. |
| Decatur | 76,256 | 675 ft. |
| Des Plaines | 57,062 | 633 ft. |
| Dongola | 791 | 393 ft. |
| Downers Grove | 49,250 | 741 ft. |
| Du Quoin | 6,326 | 465 ft. |
| East Peoria | 22,760 | 459 ft. |
| Edwardsville | 24,557 | 541 ft. |
| Effingham | 12,489 | 597 ft. |
| Eldorado | 4,392 | 390 ft. |
| Elgin | 106,330 | 744 ft. |
| Evanston | 77,693 | 613 ft. |
| Freeport | 24,615 | 777 ft. |
| Galatia | 983 | 416 ft. |
| Galena | 3,333 | 633 ft. |
| Glen Carbon | 12,607 | 465 ft. |
| Granite City | 30,703 | 423 ft. |
| Harrisburg | 9,582 | 396 ft. |
| Hennepin | 704 | 501 ft. |
| Herrin | 12,337 | 419 ft. |
| Homer Glen | 26,111 | 738 ft. |
| Jacksonville | 19,415 | 610 ft. |
| Joliet | 146,125 | 538 ft. |
| Jonesboro | 1,818 | 564 ft. |
| Kankakee | 26,710 | 656 ft. |
| LaSalle | 9,520 | None ft. |
| Lemont | 16,176 | 606 ft. |
| Lincoln | 14,541 | 580 ft. |
| Lockport | 24,810 | 593 ft. |
| Madison | 4,554 | 413 ft. |
| Malta | 1,192 | 908 ft. |
| Marion | 17,388 | 416 ft. |
| Matteson | 17,420 | 692 ft. |
| Metropolis | 6,540 | 360 ft. |
| Morton | 16,039 | 715 ft. |
| Mount Vernon | 16,298 | 511 ft. |
| Murphysboro | 8,184 | 419 ft. |
| Naperville | 143,117 | 708 ft. |
| Nashville | 3,027 | 518 ft. |
| North Utica | 1,039 | None ft. |
| O'Fallon | 27,540 | 547 ft. |
| Oglesby | 3,671 | 629 ft. |
| Olney | 8,407 | 479 ft. |
| Oswego | 31,504 | 639 ft. |
| Pekin | 33,430 | 501 ft. |
| Peoria | 114,114 | 498 ft. |
| Peru | 9,810 | 600 ft. |
| Pinckneyville | 5,384 | 433 ft. |
| Pontiac | 11,258 | 577 ft. |
| Rantoul | 12,189 | 744 ft. |
| Red Bud | 3,636 | 472 ft. |
| Robinson | 6,369 | 531 ft. |
| Rochelle | 9,847 | 823 ft. |
| Rockford | 157,272 | 715 ft. |
| Romeoville | 38,028 | 620 ft. |
| Skokie | 66,620 | 606 ft. |
| Sparta | 4,314 | 528 ft. |
| Springfield | 117,352 | 600 ft. |
| Spring Valley | 5,450 | 603 ft. |
| Swansea | 12,927 | 544 ft. |
| Tamaroa | 719 | 508 ft. |
| Troy | 9,840 | 561 ft. |
| Urbana | 39,641 | 728 ft. |
| Villa Park | 22,198 | 702 ft. |
| Waterloo | 9,813 | 708 ft. |
| Westmont | 24,979 | 748 ft. |
| Willisville | 686 | 495 ft. |
| Wilmington | 6,122 | None ft. |
| Woodridge | 34,130 | 731 ft. |
| Yorkville | 16,505 | 606 ft. |