Counties in Illinois

List of Counties in Illinois.

Counties in Illinois Thumbnail

Counties in Illinois
Counties in Illinois
Counties Population Area (km2)
Cook County 5,240,700 4,237.428
DuPage County 932,126 871.279
Lake County 703,019 3,538.139
Will County 682,829 2,199.828
Kane County 523,643 1,357.743
McHenry County 307,409 1,582.449
Winnebago County 290,666 1,348.286
Madison County 267,225 1,913.282
Saint Clair County 264,052 1,741.612
Champaign County 204,897 2,587.113
Sangamon County 199,145 2,267.976
Peoria County 188,429 1,637.124
Rock Island County 147,258 1,160.688
Tazewell County 136,352 1,700.838
Kendall County 119,348 834.692
LaSalle County 112,183 2,977.005
Kankakee County 112,120 1,766.024
Macon County 109,278 1,517.727
DeKalb County 104,741 1,644.265
Vermilion County 80,329 2,333.759
Adams County 67,130 2,256.991
Williamson County 66,924 1,153.713
Jackson County 59,814 1,558.935
Whiteside County 57,557 1,805.151
Boone County 53,957 731.5
Coles County 53,697 1,329.795
Ogle County 52,385 1,975.838
Knox County 52,078 1,867.797
Grundy County 50,228 1,118.404
Henry County 49,860 2,149.239
Macoupin County 46,880 2,253.023
Stephenson County 46,740 1,462.734
Woodford County 39,273 1,400.86
Franklin County 39,202 1,124.07
Jefferson County 38,644 1,511.93
Marion County 38,622 1,489.4
Livingston County 38,186 2,709.992
Clinton County 37,907 1,295.339
Fulton County 36,346 2,287.465
Morgan County 35,067 1,490.047
Lee County 34,858 1,882.616
Effingham County 34,307 1,248.518
Christian County 34,298 1,864.741
Bureau County 34,056 2,268.217
Monroe County 33,493 1,029.162
Randolph County 32,890 1,541.346
McDonough County 32,464 1,522.232
Logan County 29,964 1,603.561
Montgomery County 29,654 1,830.197
Iroquois County 28,982 2,898.259
Saline County 24,939 999.343
Jersey County 22,641 974.579
Jo Daviess County 22,407 1,598.734
Shelby County 22,119 1,987.855
Fayette County 22,060 1,875.376
Perry County 21,887 1,154.536
Douglas County 19,887 1,078.977
Crawford County 19,505 1,160.615
Hancock County 18,618 2,110.294
Edgar County 17,960 1,616.971
Warren County 17,726 1,404.796
Union County 17,583 1,097.286
Bond County 17,470 990.543
Wayne County 16,612 1,858.798
Lawrence County 16,558 967.366
Piatt County 16,433 1,143.795
De Witt County 16,420 1,048.425
Clark County 16,182 1,308.181
Richland County 16,182 941.633
Mercer County 16,178 1,471.273
Pike County 16,150 2,197.416
Massac County 15,073 627.94
Carroll County 14,910 1,206.645
Moultrie County 14,876 888.188
White County 14,549 1,296.449
Washington County 14,448 1,467.667
Mason County 14,248 1,457.065
Ford County 13,832 1,257.826
Greene County 13,629 1,410.01
Clay County 13,566 1,212.318
Cass County 13,324 1,000.721
Johnson County 12,677 906.832
Menard County 12,607 816.539
Marshall County 12,153 1,035.751
Wabash County 11,665 592.439
Cumberland County 10,939 897.876
Jasper County 9,592 1,291.437
Hamilton County 8,368 1,121.093
Alexander County 7,629 656.24
Schuyler County 7,444 1,139.423
Henderson County 6,990 1,028.288
Brown County 6,860 799.335
Edwards County 6,672 572.463
Pulaski County 5,908 532.784
Stark County 5,907 746.718
Putnam County 5,801 441.753
Gallatin County 5,415 847.028
Scott County 5,222 652.672
Calhoun County 5,059 733.884
Pope County 4,312 977.606
Hardin County 4,181 480.834


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