| Rank | City | 2005 Population (Est.) | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Chicago | 2,848,996 | -0.4% |
| 2 | Aurora | 164,750 | 3.3% |
| 3 | Rockford | 152,968 | 0.2% |
| 4 | Naperville | 138,816 | 1.8% |
| 5 | Joliet | 128,381 | 4.4% |
| 6 | Springfield | 114,874 | 0.6% |
| 7 | Peoria | 112,785 | -0.1% |
| 8 | Elgin | 96,849 | 0.5% |
| 9 | Waukegan | 90,433 | 0.6% |
| 10 | Cicero | 82,545 | -0.9% |
| 11 | Decatur | 78,168 | -1.2% |
| 12 | Evanston | 74,894 | 0.3% |
| 13 | Arlington Heights | 74,616 | -0.6% |
| 14 | Champaign | 74,199 | 1.3% |
| 15 | Schaumburg | 72,777 | -0.9% |
| 16 | Bloomington | 69,652 | 1.5% |
| 17 | Palatine | 66,215 | -0.0% |
| 18 | Bolingbrook | 66,185 | 3.8% |
| 19 | Skokie | 63,964 | 0.2% |
| 20 | Tinley Park | 56,230 | 3.4% |
| 21 | Des Plaines | 55,937 | -0.5% |
| 22 | Wheaton | 54,796 | -0.3% |
| 23 | Mount Prospect | 54,630 | -0.7% |
| 24 | Orland Park | 54,359 | 1.4% |
| 25 | Oak Lawn | 53,865 | -0.6% |
| 26 | Oak Park | 52,710 | 0.1% |
| 27 | Berwyn | 51,667 | -1.1% |
| 28 | Hoffman Estates | 51,496 | 0.9% |
| 29 | Normal | 49,275 | 1.9% |
| 30 | Downers Grove | 49,195 | -0.2% |
| 31 | Glenview | 45,492 | 1.3% |
| 32 | Elmhurst | 44,412 | 0.8% |
| 33 | Moline | 42,899 | -0.6% |
| 34 | Buffalo Grove | 42,861 | -0.2% |
| 35 | DeKalb | 42,823 | 2.2% |
| 36 | Lombard | 42,783 | 0.1% |
| 37 | Belleville | 41,495 | -0.5% |
| 38 | Crystal Lake | 40,301 | 1.2% |
| 39 | Carol Stream | 40,043 | -0.3% |
| 40 | Quincy | 39,653 | -0.6% |
| 41 | Rock Island | 38,641 | -0.6% |
| 42 | Urbana | 38,521 | 0.4% |
| 43 | Calumet City | 37,909 | -0.7% |
| 44 | Bartlett | 37,542 | 0.5% |
| 45 | Hanover Park | 37,154 | -0.7% |
| 46 | Addison | 36,953 | 0.4% |
| 47 | Park Ridge | 36,946 | -0.6% |
| 48 | Streamwood | 36,832 | 0.1% |
| 49 | Wheeling | 36,494 | 0.2% |
| 50 | Carpentersville | 35,619 | 3.4% |
| 51 | Romeoville | 35,177 | 12.3% |
| 52 | Northbrook | 34,001 | 0.3% |
| 53 | Elk Grove Village | 33,876 | -0.6% |
| 54 | Woodridge | 33,694 | 2.0% |
| 55 | Danville | 33,330 | -0.8% |
| 56 | Pekin | 33,084 | -0.6% |
| 57 | North Chicago | 33,061 | -2.1% |
| 58 | Glendale Heights | 32,533 | 0.4% |
| 59 | Mundelein | 32,229 | 0.9% |
| 60 | St. Charles | 32,134 | 3.3% |
| 61 | Galesburg | 32,132 | -1.2% |
| 62 | Chicago Heights | 31,478 | -1.0% |
| 63 | Granite City | 31,221 | -0.6% |
| 64 | Highland Park | 30,799 | 0.4% |
| 65 | East St. Louis | 30,095 | -1.2% |
| 66 | Gurnee | 30,084 | 1.0% |
| 67 | Alton | 29,755 | -0.6% |
| 68 | Niles | 29,405 | -0.5% |
| 69 | Harvey | 28,845 | -0.9% |
| 70 | Algonquin | 28,219 | 5.0% |
| 71 | Lake in the Hills | 28,217 | 4.1% |
| 72 | Oak Forest | 27,980 | -0.2% |
| 73 | Round Lake Beach | 27,831 | 1.6% |
| 74 | Burbank | 27,531 | -0.3% |
| 75 | Lansing | 27,369 | -0.8% |
| 76 | Glen Ellyn | 27,198 | -0.0% |
| 77 | Kankakee | 26,921 | -0.7% |
| 78 | Wilmette | 26,913 | -0.6% |
| 79 | Batavia | 26,579 | 2.2% |
| 80 | West Chicago | 25,969 | 2.1% |
| 81 | Maywood | 25,901 | -1.0% |
| 82 | Freeport | 25,603 | -0.8% |
| 83 | Collinsville | 25,560 | 0.6% |
| 84 | Carbondale | 25,415 | -0.8% |
| 85 | O'Fallon | 24,948 | 2.9% |
| 86 | Westmont | 24,776 | -0.1% |
| 87 | Plainfield | 24,634 | 15.7% |
| 88 | Dolton | 24,584 | -1.0% |
| 89 | Elmwood Park | 24,480 | -0.9% |
| 90 | Homer Glen | 23,970 | 1.7% |
| 91 | McHenry | 23,938 | 2.4% |
| 92 | Rolling Meadows | 23,870 | -0.8% |
| 93 | Edwardsville | 23,838 | 1.6% |
| 94 | Zion | 23,774 | 0.8% |
| 95 | Belvidere | 23,506 | 2.6% |
| 96 | Roselle | 23,309 | -0.0% |
| 97 | Vernon Hills | 23,093 | 3.2% |
| 98 | Park Forest | 23,032 | -0.5% |
| 99 | Lisle | 22,892 | 0.3% |
| 100 | Blue Island | 22,872 | -0.6% |
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