Illinois Counties

County Name Population
Adams County 64,783
Alexander County 5,497
Bond County 16,262
Boone County 52,777
Brown County 6,546
Bureau County 32,303
Calhoun County 4,616
Carroll County 14,241
Cass County 11,925
Champaign County 209,192
Christian County 32,075
Clark County 15,268
Clay County 13,079
Clinton County 37,398
Coles County 50,383
Cook County 5,108,284
Crawford County 18,512
Cumberland County 10,649
De Witt County 15,368
DeKalb County 104,491
Douglas County 19,510
DuPage County 917,481
Edgar County 16,858
Edwards County 6,356
Effingham County 34,065
Fayette County 21,264
Ford County 12,949
Franklin County 38,060
Fulton County 33,690
Gallatin County 4,793
Greene County 12,702
Grundy County 50,993
Hamilton County 8,084
Hancock County 17,422
Hardin County 3,808
Henderson County 6,535
Henry County 48,411
Iroquois County 26,711
Jackson County 56,675
Jasper County 9,465
Jefferson County 37,235
Jersey County 21,616
Jo Daviess County 21,239
Johnson County 12,358
Kane County 531,010
Kankakee County 108,594
Kendall County 130,638
Knox County 49,053
Lake County 693,593
LaSalle County 107,571
Lawrence County 15,467
Lee County 33,647
Livingston County 35,414
Logan County 28,383
Macon County 103,015
Macoupin County 44,567
Madison County 262,635
Marion County 37,045
Marshall County 11,309
Mason County 13,173
Massac County 13,636
McDonough County 29,295
McHenry County 305,888
McLean County 171,256
Menard County 12,068
Mercer County 15,225
Monroe County 34,739
Montgomery County 28,045
Morgan County 33,400
Moultrie County 14,347
Ogle County 50,306
Peoria County 177,652
Perry County 20,664
Piatt County 16,355
Pike County 15,239
Pope County 4,142
Pulaski County 5,201
Putnam County 5,716
Randolph County 31,351
Richland County 15,507
Rock Island County 140,907
Saint Clair County 258,046
Saline County 23,182
Sangamon County 193,882
Schuyler County 6,738
Scott County 4,950
Shelby County 21,299
Stark County 5,262
Stephenson County 43,831
Tazewell County 130,777
Union County 16,498
Vermilion County 74,855
Wabash County 11,190
Warren County 16,696
Washington County 13,764
Wayne County 16,031
White County 13,364
Whiteside County 54,656
Will County 688,726
Williamson County 66,415