County County Seat Population
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Adams County Quincy 68,277
Alexander County Cairo 9,590
Bond County Greenville 17,633
Boone County Belvidere 41,786
Brown County Mt. Sterling 6,950
Bureau County Princeton 35,503
Calhoun County Hardin 5,084
Carroll County Mt. Carroll 16,674
Cass County Virginia 13,695
Champaign County Urbana 179,669
Christian County Taylorville 35,372
Clark County Marshall 17,008
Clay County Louisville 14,560
Clinton County Carlyle 35,535
Coles County Charleston 53,196
Cook County Chicago 5,376,741
Crawford County Robinson 20,452
Cumberland County Toledo 11,253
De Kalb County Sycamore 88,969
De Witt County Clinton 16,798
Douglas County Tuscola 19,922
Du Page County Wheaton 904,161
Edgar County Paris 19,704
Edwards County Albion 6,971
Effingham County Effingham 34,264
Fayette County Vandalia 21,802
Ford County Paxton 14,241
Franklin County Benton 39,018
Fulton County Lewistown 38,250
Gallatin County Shawneetown 6,445
Greene County Carrollton 14,761
Grundy County Morris 37,535
Hamilton County McLeansboro 8,621
Hancock County Carthage 20,121
Hardin County Elizabethtown 4,800
Henderson County Oquawka 8,213
Henry County Cambridge 51,020
Iroquois County Watseka 31,334
Jackson County Murphysboro 59,612
Jasper County Newton 10,117
Jefferson County Mt. Vernon 40,045
Jersey County Jerseyville 21,668
Jo Daviess County Galena 22,289
Johnson County Vienna 12,878
Kane County Geneva 404,119
Kankakee County Kankakee 103,833
Kendall County Yorkville 54,544
Knox County Galesburg 55,836
La Salle County Ottawa 111,509
Lake County Waukegan 644,356
Lawrence County Lawrence 15,452
Lee County Dixon 36,062
Livingston County Pontiac 39,678
Logan County Lincoln 31,183
Macon County Decatur 114,706
Macoupin County Carlinville 49,019
Madison County Edwardsville 258,941
Marion County Salem 41,691
Marshall County Lacon 13,180
Mason County Havana 16,038
Massac County Metropolis 15,161
McDonough County Macomb 32,913
McHenry County Woodstock 260,077
McLean County Bloomington 150,433
Menard County Petersburg 12,486
Mercer County Aledo 16,957
Monroe County Waterloo 27,619
Montgomery County Hillsboro 30,652
Morgan County Jacksonville 36,616
Moultrie County Sullivan 14,287
Ogle County Oregon 51,032
Peoria County Peoria 183,433
Perry County Pinckneyville 23,094
Piatt County Monticello 16,365
Pike County Pittsfield 17,384
Pope County Golconda 4,413
Pulaski County Mound City 7,348
Putnam County Hennepin 6,086
Richland County Olney 16,149
Rock Island County Rock Island 149,374
Saline County Harrisburg 26,733
Sangamon County Springfield 188,951
Schuyler County Rushville 7,189
Scott County Winchester 5,537
Shelby County Shelbyville 22,893
St. Clair County Belleville 256,082
Stark County Toulon 6,332
Stephenson County Freeport 48,979
Tazewell County Pekin 128,485
Union County Jonesboro 18,293
Vermilion County Danville 83,919
Wabash County Mt. Carmel 12,937
Warren County Monmouth 18,735
Washington County Nashville 15,148
Wayne County Fairfield 17,151
White County Carmi 15,371
Whiteside County Morrison 60,653
Will County Joliet 502,266
Williamson County Marion 61,296
Winnebago County Rockford 278,418
Woodford County Eureka 35,469
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