Counties in Illinois

102 counties · Population, income, elections, and more

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102 counties

CountyPopulation
Cook County5,185,812
DuPage County927,263
Lake County711,885
Will County698,450
Kane County516,097
McHenry County311,366
Winnebago County283,289
Madison County264,631
St. Clair County254,777
Champaign County206,098
Sangamon County195,217
Peoria County179,831
McLean County170,882
Rock Island County142,995
Kendall County135,053
Tazewell County130,555
LaSalle County109,049
Kankakee County106,833
Macon County102,591
DeKalb County100,512
Vermilion County73,179
Williamson County66,902
Adams County65,166
Whiteside County55,192
Boone County53,316
Grundy County52,920
Jackson County52,706
Ogle County51,536
Knox County49,294
Henry County48,948
Coles County46,689
Macoupin County44,566
Stephenson County44,042
Woodford County38,348
Franklin County37,541
Marion County37,294
Clinton County36,899
Jefferson County36,808
Livingston County35,659
Monroe County34,969
Effingham County34,505
Lee County34,058
Christian County33,684
Fulton County33,259
Bureau County33,027
Morgan County32,621
Randolph County30,142
Montgomery County28,078
Logan County27,870
McDonough County27,102
Iroquois County26,746
Saline County23,387
Jo Daviess County21,918
Fayette County21,380
Jersey County21,336
Shelby County20,867
Perry County20,810
Douglas County19,686
Crawford County18,588
Hancock County17,434
Union County16,972
Piatt County16,702
Edgar County16,637
Bond County16,627
Warren County16,576
Wayne County15,994
Richland County15,675
Carroll County15,621
Mercer County15,619
De Witt County15,461
Clark County15,328
Lawrence County15,137
Pike County14,625
Moultrie County14,469
Massac County13,958
White County13,708
Washington County13,682
Ford County13,396
Johnson County13,350
Clay County13,173
Mason County12,878
Cass County12,826
Menard County12,169
Greene County11,837
Marshall County11,715
Wabash County11,199
Cumberland County10,378
Jasper County9,233
Hamilton County7,972
Schuyler County6,826
Brown County6,320
Henderson County6,284
Edwards County6,118
Putnam County5,600
Stark County5,324
Pulaski County5,074
Alexander County5,042
Gallatin County4,857
Scott County4,847
Calhoun County4,406
Pope County3,757
Hardin County3,623