Illinois Counties

County Name Population
Adams County 65,435
Alexander County 5,761
Bond County 16,426
Boone County 53,544
Brown County 6,578
Bureau County 32,628
Calhoun County 4,739
Carroll County 14,305
Cass County 12,147
Champaign County 209,689
Christian County 32,304
Clark County 15,441
Clay County 13,184
Clinton County 37,562
Coles County 50,621
Cook County 5,150,233
Crawford County 18,667
Cumberland County 10,766
De Witt County 15,638
DeKalb County 104,897
Douglas County 19,465
DuPage County 922,921
Edgar County 17,161
Edwards County 6,395
Effingham County 34,008
Fayette County 21,336
Ford County 12,961
Franklin County 38,469
Fulton County 34,340
Gallatin County 4,828
Greene County 12,969
Grundy County 51,054
Hamilton County 8,116
Hancock County 17,708
Hardin County 3,821
Henderson County 6,646
Henry County 48,913
Iroquois County 27,114
Jackson County 56,750
Jasper County 9,610
Jefferson County 37,684
Jersey County 21,773
Jo Daviess County 21,235
Johnson County 12,417
Kane County 532,403
Kankakee County 109,862
Kendall County 128,990
Knox County 49,699
Lake County 696,535
LaSalle County 108,669
Lawrence County 15,678
Lee County 34,096
Livingston County 35,648
Logan County 28,618
Macon County 104,009
Macoupin County 44,926
Madison County 262,966
Marion County 37,205
Marshall County 11,438
Mason County 13,359
Massac County 13,772
McDonough County 29,682
McHenry County 307,774
McLean County 171,517
Menard County 12,196
Mercer County 15,437
Monroe County 34,637
Montgomery County 28,414
Morgan County 33,658
Moultrie County 14,501
Ogle County 50,643
Peoria County 179,179
Perry County 20,916
Piatt County 16,344
Pike County 15,561
Pope County 4,177
Pulaski County 5,335
Putnam County 5,739
Randolph County 31,782
Richland County 15,513
Rock Island County 141,879
Saint Clair County 259,686
Saline County 23,491
Sangamon County 194,672
Schuyler County 6,768
Scott County 4,951
Shelby County 21,634
Stark County 5,342
Stephenson County 44,498
Tazewell County 131,803
Union County 16,653
Vermilion County 75,758
Wabash County 11,520
Warren County 16,844
Washington County 13,887
Wayne County 16,215
White County 13,537
Whiteside County 55,175
Will County 690,743
Williamson County 66,597