RANKING · 2010 CENSUS · 102 SHOWN OF 102

Largest by population, Illinois counties · 2010

The most populous Illinois counties as of the 2010 population estimates. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide.

IllinoisAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Cook County, ILIL5,194,675−3%

02DuPage County, ILIL916,924+1%

03Lake County, ILIL703,462+9%

04Will County, ILIL677,560+35%

05Kane County, ILIL515,269+28%

06McHenry County, ILIL308,760+19%

07Winnebago County, ILIL295,266+6%

08St. Clair County, ILIL270,056+5%

09Madison County, ILIL269,282+4%

10Champaign County, ILIL201,081+12%

11Sangamon County, ILIL197,465+5%

12Peoria County, ILIL186,494+2%

13McLean County, ILIL169,572+13%

14Rock Island County, ILIL147,546−1%

15Tazewell County, ILIL135,394+5%

16Kendall County, ILIL114,736+110%

17LaSalle County, ILIL113,924+2%

18Kankakee County, ILIL113,449+9%

19Macon County, ILIL110,768−3%

20DeKalb County, ILIL105,160+18%

21Vermilion County, ILIL81,625−3%

22Adams County, ILIL67,103−2%

23Williamson County, ILIL66,357+8%

24Jackson County, ILIL60,218+1%

25Whiteside County, ILIL58,498−4%

26Boone County, ILIL54,165+30%

27Coles County, ILIL53,873+1%

28Ogle County, ILIL53,497+5%

29Knox County, ILIL52,919−5%

30Henry County, ILIL50,486−1%

31Grundy County, ILIL50,063+33%

32Macoupin County, ILIL47,765−3%

33Stephenson County, ILIL47,711−3%

34Franklin County, ILIL39,561+1%

35Marion County, ILIL39,437−5%

36Livingston County, ILIL38,950−2%

37Jefferson County, ILIL38,827−3%

38Woodford County, ILIL38,664+9%

39Clinton County, ILIL37,762+6%

40Fulton County, ILIL37,069−3%

41Lee County, ILIL36,031−0%

42Morgan County, ILIL35,547−3%

43Bureau County, ILIL34,978−1%

44Christian County, ILIL34,800−2%

45Effingham County, ILIL34,242−0%

46Randolph County, ILIL33,476−1%

47Monroe County, ILIL32,957+19%

48McDonough County, ILIL32,612−1%

49Logan County, ILIL30,305−3%

50Montgomery County, ILIL30,104−2%

51Iroquois County, ILIL29,718−5%

52Saline County, ILIL24,913−7%

53Jersey County, ILIL22,985+6%

54Jo Daviess County, ILIL22,678+2%

55Shelby County, ILIL22,363−2%

56Perry County, ILIL22,350−3%

57Fayette County, ILIL22,140+2%

58Douglas County, ILIL19,980+0%

59Crawford County, ILIL19,817−3%

60Hancock County, ILIL19,104−5%

61Edgar County, ILIL18,576−6%

62Union County, ILIL17,808−3%

63Bond County, ILIL17,768+1%

64Warren County, ILIL17,707−5%

65Lawrence County, ILIL16,833+9%

66Wayne County, ILIL16,760−2%

67Piatt County, ILIL16,729+2%

68De Witt County, ILIL16,561−1%

69Mercer County, ILIL16,434−3%

70Pike County, ILIL16,430−5%

71Clark County, ILIL16,335−4%

72Richland County, ILIL16,233+1%

73Massac County, ILIL15,429+2%

74Carroll County, ILIL15,387−8%

75Moultrie County, ILIL14,846+4%

76Washington County, ILIL14,716−3%

77Mason County, ILIL14,666−9%

78White County, ILIL14,665−5%

79Ford County, ILIL14,081−1%

80Greene County, ILIL13,886−6%

81Clay County, ILIL13,815−5%

82Cass County, ILIL13,642−0%

83Menard County, ILIL12,705+2%

84Marshall County, ILIL12,640−4%

85Johnson County, ILIL12,582−2%

86Wabash County, ILIL11,947−8%

87Cumberland County, ILIL11,048−2%

88Jasper County, ILIL9,698−4%

89Hamilton County, ILIL8,457−2%

90Alexander County, ILIL8,238−14%

91Schuyler County, ILIL7,544+5%

92Henderson County, ILIL7,331−11%

93Brown County, ILIL6,937−0%

94Edwards County, ILIL6,721−4%

95Pulaski County, ILIL6,161−16%

96Putnam County, ILIL6,006−1%

97Stark County, ILIL5,994−5%

98Gallatin County, ILIL5,589−13%

99Scott County, ILIL5,355−3%

100Calhoun County, ILIL5,089+0%

101Pope County, ILIL4,470+1%

102Hardin County, ILIL4,320−10%

SHOWING 1–102 OF 102

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS