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Counties in Illinois

Explore all 102 counties in Illinois. Compare cost of living, home prices, weather, and demographics to find the best place to live.

Cook CountyPop. 5,275,541
DuPage CountyPop. 933,736
Lake CountyPop. 703,910
Will CountyPop. 687,263
Kane CountyPop. 530,847
McHenry CountyPop. 307,343
Winnebago CountyPop. 287,078
Madison CountyPop. 266,209
St. Clair CountyPop. 264,052
Champaign CountyPop. 208,861
Sangamon CountyPop. 198,712
Peoria CountyPop. 186,221
McLean CountyPop. 173,166
Rock Island CountyPop. 146,133
Tazewell CountyPop. 134,800
Kendall CountyPop. 123,355
LaSalle CountyPop. 111,333
Kankakee CountyPop. 110,879
Macon CountyPop. 107,303
DeKalb CountyPop. 104,352
Vermilion CountyPop. 79,282
Williamson CountyPop. 67,466
Adams CountyPop. 67,013
Jackson CountyPop. 59,362
Whiteside CountyPop. 57,079
Boone CountyPop. 53,585
Coles CountyPop. 52,521
Ogle CountyPop. 51,659
Knox CountyPop. 51,441
Grundy CountyPop. 50,541
Henry CountyPop. 49,489
Macoupin CountyPop. 46,045
Stephenson CountyPop. 45,749
Franklin CountyPop. 39,485
Woodford CountyPop. 39,227
Jefferson CountyPop. 38,353
Marion CountyPop. 38,339
Clinton CountyPop. 37,786
Livingston CountyPop. 36,671
Fulton CountyPop. 35,699
Morgan CountyPop. 34,828
Lee CountyPop. 34,584
Effingham CountyPop. 34,371
Monroe CountyPop. 33,879
Christian CountyPop. 33,642
Bureau CountyPop. 33,587
Randolph CountyPop. 32,852
McDonough CountyPop. 31,333
Logan CountyPop. 29,494
Montgomery CountyPop. 28,898
Iroquois CountyPop. 28,672
Saline CountyPop. 24,548
Jersey CountyPop. 22,372
Jo Daviess CountyPop. 22,086
Fayette CountyPop. 22,043
Shelby CountyPop. 21,775
Perry CountyPop. 21,543
Douglas CountyPop. 19,823
Crawford CountyPop. 19,414
Hancock CountyPop. 18,543
Edgar CountyPop. 17,664
Warren CountyPop. 17,527
Union CountyPop. 17,408
Bond CountyPop. 16,950
Lawrence CountyPop. 16,491
Wayne CountyPop. 16,423
Piatt CountyPop. 16,387
De Witt CountyPop. 16,247
Richland CountyPop. 16,029
Pike CountyPop. 15,989
Clark CountyPop. 15,979
Mercer CountyPop. 15,858
Moultrie CountyPop. 14,931
Massac CountyPop. 14,766
Carroll CountyPop. 14,616
White CountyPop. 14,327
Washington CountyPop. 14,270
Ford CountyPop. 13,736
Mason CountyPop. 13,701
Clay CountyPop. 13,428
Greene CountyPop. 13,241
Cass CountyPop. 12,847
Johnson CountyPop. 12,762
Menard CountyPop. 12,444
Marshall CountyPop. 11,982
Wabash CountyPop. 11,542
Cumberland CountyPop. 10,898
Jasper CountyPop. 9,607
Hamilton CountyPop. 8,200
Schuyler CountyPop. 7,032
Henderson CountyPop. 6,995
Brown CountyPop. 6,829
Alexander CountyPop. 6,780
Edwards CountyPop. 6,534
Stark CountyPop. 5,788
Pulaski CountyPop. 5,678
Putnam CountyPop. 5,644
Gallatin CountyPop. 5,265
Scott CountyPop. 5,092
Calhoun CountyPop. 4,899
Pope CountyPop. 4,226
Hardin CountyPop. 4,135
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