Illinois Counties

There are a total of 102 Counties in Illinois. The most populous County is Cook County with 5197677 residents. The least populous County is Hardin County with 4315 residents.

Map List Related

Map of All Counties in Illinois

List of All Counties in Illinois

Map KeyNamePopulation
Adams County67,098
Alexander County8,147
Bond County17,762
Boone County54,141
Brown County6,913
Bureau County34,798
Calhoun County5,065
Carroll County15,338
Cass County13,570
Champaign County200,931
Christian County34,805
Clark County16,353
Clay County13,828
Clinton County37,793
Coles County53,683
Cook County5,197,677
Crawford County19,777
Cumberland County11,044
De Witt County16,562
DeKalb County104,820
Douglas County19,908
DuPage County918,608
Edgar County18,513
Edwards County6,691
Effingham County34,258
Fayette County22,082
Ford County14,045
Franklin County39,518
Fulton County36,989
Gallatin County5,592
Greene County13,828
Grundy County49,870
Hamilton County8,430
Hancock County19,063
Hardin County4,315
Henderson County7,275
Henry County50,378
Iroquois County29,689
Jackson County59,992
Jasper County9,707
Jefferson County38,908
Jersey County22,939
Jo Daviess County22,663
Johnson County12,653
Kane County514,891
Kankakee County113,170
Kendall County114,226
Knox County52,698
Lake County701,282
LaSalle County113,688
Lawrence County16,778
Lee County35,778
Livingston County38,903
Logan County30,278
Macon County110,558
Macoupin County47,712
Madison County268,586
Marion County39,319
Marshall County12,567
Mason County14,636
Massac County15,370
Mcdonough County32,568
Mchenry County308,163
Mclean County169,689
Menard County12,728
Mercer County16,421
Monroe County33,003
Montgomery County29,977
Morgan County35,544
Moultrie County14,844
Ogle County53,378
Peoria County186,399
Perry County22,287
Piatt County16,679
Pike County16,436
Pope County4,399
Pulaski County6,107
Putnam County5,968
Randolph County33,353
Richland County16,181
Rock Island County147,504
Saint Clair County268,873
Saline County24,975
Sangamon County197,474
Schuyler County7,499
Scott County5,322
Shelby County22,316
Stark County5,983
Stephenson County47,532
Tazewell County135,201
Union County17,799
Vermilion County81,463
Wabash County11,935
Warren County17,723
Washington County14,692
Wayne County16,727
White County14,686
Whiteside County58,400
Will County677,669
Williamson County66,335
Winnebago County294,433
Woodford County38,736

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