Illinois — All 101 Counties

Illinois has 101 counties with 1,460 communities and a combined population of 11,221,014.

CountyTownsPopulation
Cook County1365,495,088
DuPage County27963,858
Lake County55617,291
Kendall County11276,681
Kane County21250,747
Madison County33222,693
Will County34211,214
McHenry County35197,676
St. Clair County30196,391
Peoria County21181,644
Champaign County28178,635
Ogle County18170,233
Sangamon County26163,927
McLean County24156,764
Rock Island County22124,785
Macon County1490,896
DeKalb County1387,397
Kankakee County1979,243
Tazewell County1776,567
LaSalle County2873,098
Grundy County1767,405
Boone County1064,583
Winnebago County958,817
Vermilion County2150,157
Adams County2547,790
Williamson County1645,612
Knox County1641,954
Henry County1838,492
Whiteside County1337,009
Bureau County2536,480
Coles County835,956
Clinton County1535,269
Jackson County1234,781
Stephenson County1334,341
Lee County1431,224
Monroe County727,808
Macoupin County2527,431
Christian County1626,569
Morgan County1226,143
Franklin County1724,945
McDonough County1224,640
Fulton County2024,188
Crawford County1721,663
Randolph County1421,291
Montgomery County1721,013
Livingston County1320,996
Logan County1419,997
Effingham County919,596
Jefferson County1019,542
Woodford County1319,234
Iroquois County2117,818
Saline County715,711
Douglas County914,631
Marion County1213,534
Jo Daviess County1212,881
Hancock County1612,383
Perry County612,299
Jersey County812,045
Piatt County911,923
Edgar County811,626
Warren County511,133
Bond County1010,905
De Witt County810,811
Carroll County810,713
Pike County1910,441
Mercer County1810,379
Richland County610,357
Fayette County810,123
Cass County59,401
Lawrence County58,936
Greene County98,486
Shelby County108,286
Union County68,186
Mason County98,095
White County88,074
Clark County58,039
Marshall County88,029
Wabash County47,759
Moultrie County77,708
Clay County67,383
Washington County127,311
Menard County67,296
Wayne County107,214
Massac County36,842
Edwards County54,764
Cumberland County54,707
Johnson County74,168
Stark County43,843
Alexander County73,725
Jasper County83,693
Hamilton County43,641
Henderson County93,530
Putnam County63,499
Gallatin County73,453
Pulaski County73,282
Scott County102,975
Schuyler County42,915
Brown County42,540
Calhoun County51,511
Hardin County31,453
Pope County2803