Illinois
Largest Urban Areas
- St. Louis, MO, pop. 2150706
- Rockford, pop. 296863
- Davenport, IA, pop. 280051
- Peoria, pop. 266921
- Springfield, pop. 161316
- Champaign, pop. 145361
- Bloomington--Normal, pop. 132600
- Kenosha, WI, pop. 124064
- Decatur, pop. 93863
- Kankakee, pop. 81926
Largest Counties
- Cook County, pop. 5194675
- DuPage County, pop. 916924
- Lake County, pop. 703462
- Will County, pop. 677560
- Kane County, pop. 515269
- McHenry County, pop. 308760
- Winnebago County, pop. 295266
- St. Clair County, pop. 270056
- Madison County, pop. 269282
- Champaign County, pop. 201081
Nearby States
- Illinois, pop. 12830632
- Indiana, pop. 6483802
- Missouri, pop. 5988927
- Iowa, pop. 3046355
- Kentucky, pop. 4339367
- Wisconsin, pop. 5686986
- Ohio, pop. 11536504
- Michigan, pop. 9883640
- Tennessee, pop. 6346105
- Arkansas, pop. 2915918
Largest Public Use Microdata Areas
- Chicago City (West)--North & South Lawndale, Humboldt Park, East & West Garfield Park PUMA, pop. 210091
- Winnebago County (Southeast & West)--Rockford City PUMA, pop. 204179
- Champaign County--Champaign & Urbana Cities PUMA, pop. 201081
- Sangamon County--Springfield City PUMA, pop. 197465
- Cook County (Central)--Cicero, Berwyn & Oak Park Townships PUMA, pop. 192426
- Chicago City (West)--Austin, Belmont Cragin & Montclare PUMA, pop. 190683
- Jackson, Williamson, Franklin & Perry Counties PUMA, pop. 188486
- Peoria County--Peoria City PUMA, pop. 186494
- Cook County (North)--Maine, Norwood Park Townships & Chicago City--Edison Park PUMA, pop. 185920
- Henry, Mercer, Henderson, Warren, Hancock, McDonough & Fulton Counties PUMA, pop. 180743
Largest Places
- Chicago city, pop. 2695598
- Aurora city, pop. 197899
- Rockford city, pop. 152871
- Joliet city, pop. 147433
- Naperville city, pop. 141853
- Springfield city, pop. 116250
- Peoria city, pop. 115007
- Elgin city, pop. 108188
- Waukegan city, pop. 89078
- Cicero town, pop. 83891
- Champaign city, pop. 81055
- Bloomington city, pop. 76610
- Decatur city, pop. 76122
- Arlington Heights village, pop. 75101
- Evanston city, pop. 74486
- Schaumburg village, pop. 74227
- Bolingbrook village, pop. 73366
- Palatine village, pop. 68557
- Skokie village, pop. 64784
- Des Plaines city, pop. 58364
Largest County Subdivisions
Largest Zip Codes
- 60629, pop. 113916
- 60623, pop. 92108
- 60618, pop. 92084
- 60632, pop. 91326
- 60639, pop. 90407
- 60647, pop. 87291
- 60804, pop. 84573
- 60617, pop. 84155
- 60608, pop. 82739
- 60625, pop. 78651
- 60505, pop. 76573
- 60634, pop. 74298
- 60620, pop. 72216
- 60628, pop. 72202
- 60085, pop. 71714
- 60641, pop. 71663
- 60614, pop. 66617
- 60657, pop. 65996
- 60640, pop. 65790
- 60609, pop. 64906