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  IL Counties
County
 Adams    65,737
 Alexander    5,240
 Bond    16,725
 Boone    53,448
 Brown    6,244
 Bureau    33,244
 Calhoun    4,437
 Carroll    15,702
 Cass    13,042
 Champaign    205,865
 Christian    34,032
 Clark    15,455
 Clay    13,288
 Clinton    36,899
 Coles    46,863
 Cook    5,275,541
 Crawford    18,679
 Cumberland    10,450
 DeKalb    100,420
 DeWitt    15,516
 Douglas    19,740
 DuPage    932,877
 Edgar    16,866
 Edwards    6,245
 Effingham    34,668
 Fayette    21,488
 Ford    13,534
 Franklin    37,804
 Fulton    33,609
 Gallatin    4,946
 Greene    11,985
 Grundy    52,533
 Hamilton    7,993
 Hancock    17,620
 Hardin    3,649
 Henderson    6,387
 Henry    49,284
 Iroquois    27,077
 Jackson    52,974
 Jasper    9,287
 Jefferson    37,113
 Jersey    21,512
 JoDaviess    22,035
 Johnson    13,308
 Kane    516,522
 Kankakee    107,502
 Kendall    131,869
 Knox    49,967
 Lake    714,342
 LaSalle    109,658
 Lawrence    15,280
 Lee    34,145
 Livingston    35,815
 Logan    27,987
 Macon    103,998
 Macoupin    44,967
 Madison    265,859
 Marion    37,729
 Marshall    11,742
 Mason    13,086
 Massac    14,169
 McDonough    27,238
 McHenry    310,229
 McLean    170,954
 Menard    12,297
 Mercer    15,699
 Monroe    34,962
 Montgomery    28,288
 Morgan    32,915
 Moultrie    14,526
 Ogle    51,788
 Peoria    181,830
 Perry    20,945
 Piatt    16,673
 Pike    14,739
 Pope    3,763
 Pulaski    5,193
 Putnam    5,637
 Randolph    30,163
 Richland    15,813
 Rock Island    144,672
 Saline    23,768
 Sangamon    196,343
 Schuyler    6,902
 Scott    4,949
 Shelby    20,990
 St. Clair    257,400
 Stark    5,400
 Stephenson    44,630
 Tazewell    131,343
 Union    17,244
 Vermilion    74,188
 Wabash    11,361
 Warren    16,835
 Washington    13,761
 Wayne    16,179
 White    13,877
 Whiteside    55,691
 Will    696,355
 Williamson    67,153
 Winnebago    285,350
 Woodford    38,467


County List DETAILS
Parents > United States > Illinois  
Established 00, 0000
Disbanded Still Active
ContributorGerald Farinas
Last ModifiedRP March 12, 2023 11:11pm
Description Counties of the State of Illinois

There are 102 counties in the State of Illinois. The most populated counties are Cook, DuPage, Lake, Will and Kane. The least dense is Pope, which is also the smallest in acreage.

The oldest county in Illinois is St. Claire founded in 1790. Its seat is Belleville. The newest counties were founded in 1859, Ford and Douglas.

Illinois' counties are organized under the Illinois Association of County Board Members and Commissioners, affiliated with the National Association of Counties. You can contact them through 413 West Monroe Street, 2nd Floor, Springfield, IL 62704-1959, Phone (217)528-5331, Fax (217)528-5562 .
Adams Alexander Bond Boone Brown Bureau Calhoun Carroll Cass Champaign Christian Clark Clay Clinton Coles Cook Crawford Cumberland De Witt DeKalb Douglas DuPage Edgar Edwards Effingham Fayette Ford Franklin Fulton Gallatin Greene Grundy Hamilton Hancock Hardin Henderson Henry Iroquois Jackson Jasper Jefferson Jersey Jo Daviess Johnson Kane Kankakee Kendall Knox La Salle Lake Lawrence Lee Livingston Logan Macon Macoupin Madison Marion Marshall Mason Massac McDonough McHenry McLean Menard Mercer Monroe Montgomery Morgan Moultrie Ogle Peoria Perry Piatt Pike Pope Pulaski Putnam Randolph Richland Rock Island Saline Sangamon Schuyler Scott Shelby St. Clair Stark Stephenson Tazewell Union Vermilion Wabash Warren Washington Wayne White Whiteside Will Williamson Winnebago Woodford
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