RANKING · 1990 CENSUS · 102 SHOWN OF 102

Largest by population, Illinois counties · 1990

The most populous Illinois counties as of the 1990 population estimates. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 26,551.

IllinoisAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS –

01Cook County, ILIL5,105,067–

02DuPage County, ILIL781,666–

03Lake County, ILIL516,418–

04Will County, ILIL357,313–

05Kane County, ILIL317,471–

06St. Clair County, ILIL262,852–

07Winnebago County, ILIL252,913–

08Madison County, ILIL249,238–

09McHenry County, ILIL183,241–

10Peoria County, ILIL182,827–

11Sangamon County, ILIL178,386–

12Champaign County, ILIL173,025–

13Rock Island County, ILIL148,723–

14McLean County, ILIL129,180–

15Tazewell County, ILIL123,692–

16Macon County, ILIL117,206–

17LaSalle County, ILIL106,913–

18Kankakee County, ILIL96,255–

19Vermilion County, ILIL88,257–

20DeKalb County, ILIL77,932–

21Adams County, ILIL66,090–

22Jackson County, ILIL61,067–

23Whiteside County, ILIL60,186–

24Williamson County, ILIL57,733–

25Knox County, ILIL56,393–

26Coles County, ILIL51,644–

27Henry County, ILIL51,159–

28Stephenson County, ILIL48,052–

29Macoupin County, ILIL47,679–

30Ogle County, ILIL45,957–

31Marion County, ILIL41,561–

32Franklin County, ILIL40,319–

33Kendall County, ILIL39,413–

34Livingston County, ILIL39,301–

35Fulton County, ILIL38,080–

36Jefferson County, ILIL37,020–

37Morgan County, ILIL36,397–

38Bureau County, ILIL35,688–

39McDonough County, ILIL35,244–

40Randolph County, ILIL34,583–

41Christian County, ILIL34,418–

42Lee County, ILIL34,392–

43Clinton County, ILIL33,944–

44Woodford County, ILIL32,653–

45Grundy County, ILIL32,337–

46Effingham County, ILIL31,704–

47Boone County, ILIL30,806–

48Logan County, ILIL30,798–

49Iroquois County, ILIL30,787–

50Montgomery County, ILIL30,728–

51Saline County, ILIL26,551–

52Monroe County, ILIL22,422–

53Shelby County, ILIL22,261–

54Jo Daviess County, ILIL21,821–

55Perry County, ILIL21,412–

56Hancock County, ILIL21,373–

57Fayette County, ILIL20,893–

58Jersey County, ILIL20,539–

59Edgar County, ILIL19,595–

60Crawford County, ILIL19,464–

61Douglas County, ILIL19,464–

62Warren County, ILIL19,181–

63Union County, ILIL17,619–

64Pike County, ILIL17,577–

65Mercer County, ILIL17,290–

66Wayne County, ILIL17,241–

67Carroll County, ILIL16,805–

68Richland County, ILIL16,545–

69White County, ILIL16,522–

70De Witt County, ILIL16,516–

71Mason County, ILIL16,269–

72Lawrence County, ILIL15,972–

73Clark County, ILIL15,921–

74Piatt County, ILIL15,548–

75Greene County, ILIL15,317–

76Bond County, ILIL14,991–

77Washington County, ILIL14,965–

78Massac County, ILIL14,752–

79Clay County, ILIL14,460–

80Ford County, ILIL14,275–

81Moultrie County, ILIL13,930–

82Cass County, ILIL13,437–

83Wabash County, ILIL13,111–

84Marshall County, ILIL12,846–

85Johnson County, ILIL11,347–

86Menard County, ILIL11,164–

87Cumberland County, ILIL10,670–

88Alexander County, ILIL10,626–

89Jasper County, ILIL10,609–

90Hamilton County, ILIL8,499–

91Henderson County, ILIL8,096–

92Pulaski County, ILIL7,523–

93Schuyler County, ILIL7,498–

94Edwards County, ILIL7,440–

95Gallatin County, ILIL6,909–

96Stark County, ILIL6,534–

97Brown County, ILIL5,836–

98Putnam County, ILIL5,730–

99Scott County, ILIL5,644–

100Calhoun County, ILIL5,322–

101Hardin County, ILIL5,189–

102Pope County, ILIL4,373–

SHOWING 1–102 OF 102

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS