Illinois Counties Map

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Hover/click a county for data.

Name 2021 Population Growth Since 2010 Land Area (mi²) Density (mi²)
Cook County5,106,780-1.77%945.335,402.10
DuPage County914,269-0.40%327.512,791.54
Lake County690,431-1.95%443.661,556.21
Will County689,9311.64%836.94824.35
Kane County531,7693.04%520.161,022.31
McHenry County306,820-0.74%603.22508.64
Winnebago County280,456-4.96%513.42546.25
Madison County260,846-3.14%715.73364.45
St. Clair County256,338-5.18%657.78389.70
Champaign County209,2313.81%996.26210.02
Sangamon County192,738-2.54%868.30221.97
Peoria County176,297-5.33%619.19284.72
McLean County169,731-0.05%1,183.35143.43
Rock Island County140,395-4.89%427.46328.44
Kendall County131,53614.01%320.29410.68
Tazewell County130,509-3.67%649.08201.07
Kankakee County109,680-3.30%676.57162.11
LaSalle County107,689-5.39%1,135.1494.87
DeKalb County105,9930.81%631.35167.88
Macon County103,019-7.01%580.69177.41
Vermilion County73,870-9.52%898.3782.23
Williamson County65,827-0.91%420.17156.67
Adams County65,059-3.13%855.2176.07
Jackson County55,672-7.79%584.0795.32
Whiteside County54,419-6.95%684.2579.53
Boone County53,672-0.79%280.74191.18
Grundy County51,2162.12%418.05122.51
Ogle County50,367-5.70%758.5866.40
Coles County50,205-6.80%508.2998.77
Knox County49,141-7.13%716.4268.59
Henry County48,601-3.67%823.0059.05
Macoupin County44,142-7.65%862.9251.15
Stephenson County43,900-7.78%564.5577.76
Woodford County38,323-0.87%527.8172.61
Franklin County38,017-5.04%408.8992.98
Jefferson County37,636-2.89%571.1665.89
Clinton County37,292-1.46%474.0878.66
Marion County36,853-6.50%572.3764.39
Livingston County35,516-8.59%1,044.2934.01
Monroe County35,1656.58%385.0291.33
Lee County33,696-6.36%724.8646.49
Effingham County33,662-1.64%478.7870.31
Fulton County33,360-10.02%865.6038.54
Morgan County32,920-7.28%568.8057.88
Bureau County31,966-8.56%869.0336.78
Christian County31,606-9.08%709.3844.55
Randolph County30,992-7.39%575.5053.85
McDonough County29,078-10.90%589.4149.33
Logan County28,030-7.44%618.0645.35
Montgomery County27,860-7.43%703.6939.59
Iroquois County26,374-11.20%1,117.2923.61
Saline County22,895-8.06%379.8360.28
Jersey County21,729-5.51%369.2858.84
Shelby County21,450-4.04%758.5428.28
Fayette County21,272-3.88%716.4929.69
Jo Daviess County21,043-7.09%600.9135.02
Perry County20,460-8.31%441.7746.31
Douglas County19,479-2.52%416.6646.75
Crawford County18,341-7.37%443.6341.34
Hancock County17,468-8.50%793.7322.01
Edgar County16,763-9.43%623.3726.89
Warren County16,548-6.58%542.4130.51
Piatt County16,300-2.45%439.1737.12
Union County16,295-8.10%413.4639.41
Bond County16,004-10.02%380.2842.08
Wayne County15,993-4.45%713.8122.40
Pike County15,493-5.50%831.4018.63
Lawrence County15,408-9.04%372.1841.40
De Witt County15,326-7.62%397.5538.55
Mercer County15,209-7.31%561.2027.10
Richland County15,149-6.45%360.0142.08
Clark County15,123-7.17%501.4230.16
Carroll County14,287-7.19%445.0632.10
Moultrie County14,207-4.39%335.9442.29
Washington County13,663-7.13%562.5724.29
White County13,375-8.37%494.7727.03
Massac County13,270-13.72%237.2255.94
Clay County13,020-5.83%468.3327.80
Mason County13,011-11.19%539.2424.13
Greene County12,777-8.01%543.0223.53
Ford County12,459-11.52%485.6125.66
Johnson County12,405-1.58%343.9236.07
Menard County12,010-5.40%314.4438.20
Cass County11,817-13.32%375.8131.44
Wabash County11,514-3.37%223.2551.57
Marshall County11,348-10.20%386.7929.34
Cumberland County10,690-3.28%346.0330.89
Jasper County9,582-1.47%494.5219.38
Hamilton County8,052-4.66%434.6718.52
Brown County6,608-4.49%305.6121.62
Schuyler County6,564-12.89%437.2715.01
Henderson County6,544-10.88%378.8717.27
Edwards County6,411-4.80%222.4228.82
Putnam County5,745-4.44%160.1635.87
Alexander County5,201-36.62%235.5222.08
Stark County5,190-13.05%288.0818.02
Pulaski County5,137-16.14%199.1925.79
Scott County4,999-6.16%250.9119.92
Calhoun County4,559-10.54%253.8217.96
Gallatin County4,394-21.16%323.0713.60
Pope County4,163-6.95%368.7711.29
Hardin County3,677-14.86%177.5320.71

Counties in Illinois

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)

Sources