RANKING · 2000 CENSUS · 102 SHOWN OF 102

Largest by population, Illinois counties · 2000

The most populous Illinois counties as of the 2000 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 1990

01Cook County, ILIL5,376,741+5%

02DuPage County, ILIL904,161+16%

03Lake County, ILIL644,356+25%

04Will County, ILIL502,266+41%

05Kane County, ILIL404,119+27%

06Winnebago County, ILIL278,418+10%

07McHenry County, ILIL260,077+42%

08Madison County, ILIL258,941+4%

09St. Clair County, ILIL256,082−3%

10Sangamon County, ILIL188,951+6%

11Peoria County, ILIL183,433+0%

12Champaign County, ILIL179,669+4%

13McLean County, ILIL150,433+16%

14Rock Island County, ILIL149,374+0%

15Tazewell County, ILIL128,485+4%

16Macon County, ILIL114,706−2%

17LaSalle County, ILIL111,509+4%

18Kankakee County, ILIL103,833+8%

19DeKalb County, ILIL88,969+14%

20Vermilion County, ILIL83,919−5%

21Adams County, ILIL68,277+3%

22Williamson County, ILIL61,296+6%

23Whiteside County, ILIL60,653+1%

24Jackson County, ILIL59,612−2%

25Knox County, ILIL55,836−1%

26Kendall County, ILIL54,544+38%

27Coles County, ILIL53,196+3%

28Ogle County, ILIL51,032+11%

29Henry County, ILIL51,020−0%

30Macoupin County, ILIL49,019+3%

31Stephenson County, ILIL48,979+2%

32Boone County, ILIL41,786+36%

33Marion County, ILIL41,691+0%

34Jefferson County, ILIL40,045+8%

35Livingston County, ILIL39,678+1%

36Franklin County, ILIL39,018−3%

37Fulton County, ILIL38,250+0%

38Grundy County, ILIL37,535+16%

39Morgan County, ILIL36,616+1%

40Lee County, ILIL36,062+5%

41Clinton County, ILIL35,535+5%

42Bureau County, ILIL35,503−1%

43Woodford County, ILIL35,469+9%

44Christian County, ILIL35,372+3%

45Effingham County, ILIL34,264+8%

46Randolph County, ILIL33,893−2%

47McDonough County, ILIL32,913−7%

48Iroquois County, ILIL31,334+2%

49Logan County, ILIL31,183+1%

50Montgomery County, ILIL30,652−0%

51Monroe County, ILIL27,619+23%

52Saline County, ILIL26,733+1%

53Perry County, ILIL23,094+8%

54Shelby County, ILIL22,893+3%

55Jo Daviess County, ILIL22,289+2%

56Fayette County, ILIL21,802+4%

57Jersey County, ILIL21,668+5%

58Crawford County, ILIL20,452+5%

59Hancock County, ILIL20,121−6%

60Douglas County, ILIL19,922+2%

61Edgar County, ILIL19,704+1%

62Warren County, ILIL18,735−2%

63Union County, ILIL18,293+4%

64Bond County, ILIL17,633+18%

65Pike County, ILIL17,384−1%

66Wayne County, ILIL17,151−1%

67Clark County, ILIL17,008+7%

68Mercer County, ILIL16,957−2%

69De Witt County, ILIL16,798+2%

70Carroll County, ILIL16,674−1%

71Piatt County, ILIL16,365+5%

72Richland County, ILIL16,149−2%

73Mason County, ILIL16,038−1%

74Lawrence County, ILIL15,452−3%

75White County, ILIL15,371−7%

76Massac County, ILIL15,161+3%

77Washington County, ILIL15,148+1%

78Greene County, ILIL14,761−4%

79Clay County, ILIL14,560+1%

80Moultrie County, ILIL14,287+3%

81Ford County, ILIL14,241−0%

82Cass County, ILIL13,695+2%

83Marshall County, ILIL13,180+3%

84Wabash County, ILIL12,937−1%

85Johnson County, ILIL12,878+13%

86Menard County, ILIL12,486+12%

87Cumberland County, ILIL11,253+5%

88Jasper County, ILIL10,117−5%

89Alexander County, ILIL9,590−10%

90Hamilton County, ILIL8,621+1%

91Henderson County, ILIL8,213+1%

92Pulaski County, ILIL7,348−2%

93Schuyler County, ILIL7,189−4%

94Edwards County, ILIL6,971−6%

95Brown County, ILIL6,950+19%

96Gallatin County, ILIL6,445−7%

97Stark County, ILIL6,332−3%

98Putnam County, ILIL6,086+6%

99Scott County, ILIL5,537−2%

100Calhoun County, ILIL5,084−4%

101Hardin County, ILIL4,800−7%

102Pope County, ILIL4,413+1%

SHOWING 1–102 OF 102

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