 Census
2000 
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Census Data 
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 Other
IL Data 
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TOTAL
4,413 - 13,695
14,241 - 19,704
19,922 - 35,535
36,052 - 68,277
83,919 - 5,376,742
- Place mouse on county to view population figures for selected demographic.
- Click on county to view a list of city population within the county.
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Ten largest counties
2000 Census Population |
Fastest growing counties by net change
1990-2000 Net Change |
- Cook
County
- DuPage
County
- Lake
County
- Will
County
- Kane
County
- Winnebago
County
- McHenry
County
- Madison
County
- St. Clair
County
- Sangamon
County
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5,376,741
904,161
644,356
502,266
404,119
278,418
260,077
258,941
256,082
188,951
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- Cook
County
- Will
County
- Lake
County
- DuPage
County
- Kane
County
- McHenry
County
- Winnebago
County
- McLean
County
- Kendall
County
- DeKalb
County
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271,674
144,953
127,938
122,495
86,648
76,836
25,505
21,253
15,131
11,037
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