| Rank | City | 1990 Population | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Chicago | 2,783,660 | -0.8% |
| 2 | Rockford | 143,942 | – |
| 3 | Peoria | 113,822 | – |
| 4 | Springfield | 107,265 | – |
| 5 | Aurora | 100,279 | – |
| 6 | Naperville | 86,958 | – |
| 7 | Decatur | 85,424 | – |
| 8 | Joliet | 78,585 | – |
| 9 | Elgin | 77,353 | – |
| 10 | Arlington Heights | 74,739 | – |
| 11 | Evanston | 73,234 | – |
| 12 | Waukegan | 69,621 | – |
| 13 | Schaumburg | 68,678 | – |
| 14 | Cicero | 67,355 | – |
| 15 | Champaign | 64,399 | – |
| 16 | Skokie | 59,431 | – |
| 17 | Oak Lawn | 56,316 | – |
| 18 | Des Plaines | 54,917 | – |
| 19 | Oak Park | 53,610 | – |
| 20 | Mount Prospect | 53,081 | – |
| 21 | Bloomington | 52,655 | – |
| 22 | Wheaton | 52,057 | – |
| 23 | Palatine | 49,791 | – |
| 24 | Downers Grove | 47,493 | – |
| 25 | Hoffman Estates | 46,367 | – |
| 26 | Berwyn | 45,538 | – |
| 27 | Moline | 44,046 | – |
| 28 | Belleville | 43,058 | – |
| 29 | Elmhurst | 41,929 | – |
| 30 | Bolingbrook | 41,028 | – |
| 31 | East St. Louis | 40,865 | – |
| 32 | Rock Island | 40,537 | – |
| 33 | Quincy | 40,523 | – |
| 34 | Normal | 40,134 | – |
| 35 | Lombard | 40,113 | – |
| 36 | Glenview | 39,288 | – |
| 37 | Orland Park | 37,885 | – |
| 38 | Tinley Park | 37,846 | – |
| 39 | Calumet City | 37,712 | – |
| 40 | Park Ridge | 37,360 | – |
| 41 | Urbana | 37,182 | – |
| 42 | Buffalo Grove | 36,653 | – |
| 43 | DeKalb | 36,044 | – |
| 44 | North Chicago | 35,989 | – |
| 45 | Danville | 35,045 | – |
| 46 | Galesburg | 33,748 | – |
| 47 | Elk Grove Village | 33,487 | – |
| 48 | Alton | 33,135 | – |
| 49 | Granite City | 33,132 | – |
| 50 | Chicago Heights | 33,070 | – |
| 51 | Hanover Park | 32,910 | – |
| 52 | Northbrook | 32,743 | – |
| 53 | Pekin | 32,228 | – |
| 54 | Addison | 32,125 | – |
| 55 | Carol Stream | 31,785 | – |
| 56 | Streamwood | 31,461 | – |
| 57 | Highland Park | 30,561 | – |
| 58 | Harvey | 30,283 | – |
| 59 | Wheeling | 29,477 | – |
| 60 | Niles | 28,794 | – |
| 61 | Lansing | 28,221 | – |
| 62 | Kankakee | 27,972 | – |
| 63 | Glendale Heights | 27,610 | – |
| 64 | Burbank | 27,580 | – |
| 65 | Carbondale | 27,438 | – |
| 66 | Maywood | 27,147 | – |
| 67 | Oak Forest | 27,109 | – |
| 68 | Wilmette | 26,829 | – |
| 69 | Woodridge | 26,590 | – |
| 70 | Freeport | 26,210 | – |
| 71 | Glen Ellyn | 25,409 | – |
| 72 | Crystal Lake | 25,174 | – |
| 73 | Park Forest | 24,695 | – |
| 74 | Dolton | 24,011 | – |
| 75 | Elmwood Park | 23,206 | – |
| 76 | Carpentersville | 23,037 | – |
| 77 | St. Charles | 23,019 | – |
| 78 | Rolling Meadows | 22,757 | – |
| 79 | Collinsville | 22,744 | – |
| 80 | East Peoria | 22,629 | – |
| 81 | Morton Grove | 22,260 | – |
| 82 | Westmont | 22,121 | – |
| 83 | South Holland | 22,073 | – |
| 84 | Villa Park | 21,516 | – |
| 85 | Mundelein | 21,340 | – |
| 86 | Blue Island | 21,198 | – |
| 87 | Roselle | 20,929 | – |
| 88 | Melrose Park | 20,922 | – |
| 89 | Evergreen Park | 20,874 | – |
| 90 | Charleston | 20,627 | – |
| 91 | Darien | 20,575 | – |
| 92 | East Moline | 20,273 | – |
| 93 | Bellwood | 20,240 | – |
| 94 | Macomb | 20,158 | – |
| 95 | Libertyville | 19,952 | – |
| 96 | Zion | 19,849 | – |
| 97 | Bartlett | 19,665 | – |
| 98 | Lisle | 19,588 | – |
| 99 | Jacksonville | 19,483 | – |
| 100 | Homewood | 19,072 | – |
In 1990, the largest city in Illinois was Chicago, with a population of 2,783,660. The second largest city is Rockford, with a population of 143,942.
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