RANKING · 2000 CENSUS · 102 SHOWN OF 102

Most densely populated, Illinois counties · 2000

Illinois counties ranked by residents per square mile (2023). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide.

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RELATEDLargest by population Fastest growing Fastest shrinking Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Cook County, ILIL5,194,6255,690+0%

02DuPage County, ILIL934,2982,758+0%

03Lake County, ILIL719,3391,453+0%

04Kane County, ILIL525,757778+0%

05Will County, ILIL712,253601+0%

06Winnebago County, ILIL283,674543+0%

07McHenry County, ILIL317,751431+0%

08St. Clair County, ILIL250,708389+0%

09Madison County, ILIL263,110362+0%

10Rock Island County, ILIL141,869349+0%

11Peoria County, ILIL178,553296+0%

12Sangamon County, ILIL194,170218+0%

13Tazewell County, ILIL130,049199+0%

14Macon County, ILIL99,300198+0%

15Champaign County, ILIL209,972180+0%

16Kendall County, ILIL145,470170+0%

17Kankakee County, ILIL105,525153+0%

18Boone County, ILIL53,568149+0%

19Williamson County, ILIL67,225146+0%

20DeKalb County, ILIL101,835141+0%

21McLean County, ILIL171,419127+0%

22Coles County, ILIL46,607105+0%

23Jackson County, ILIL52,501102+0%

24LaSalle County, ILIL107,77398+0%

25Franklin County, ILIL36,91695+0%

26Vermilion County, ILIL71,25993+0%

27Grundy County, ILIL54,05290+0%

28Whiteside County, ILIL54,12189+0%

29Stephenson County, ILIL43,22087+0%

30Adams County, ILIL64,26780+0%

31Knox County, ILIL47,76778+0%

32Clinton County, ILIL37,12875+0%

33Marion County, ILIL36,38273+0%

34Monroe County, ILIL34,84072+0%

35Effingham County, ILIL34,51972+0%

36Saline County, ILIL22,77270+0%

37Jefferson County, ILIL36,14770+0%

38Ogle County, ILIL51,39967+0%

39Woodford County, ILIL38,11167+0%

40Morgan County, ILIL32,51564+0%

41Massac County, ILIL13,50264+0%

42Henry County, ILIL48,09562+0%

43Randolph County, ILIL29,92159+0%

44Jersey County, ILIL21,16059+0%

45Wabash County, ILIL10,90758+0%

46Macoupin County, ILIL43,74857+0%

47McDonough County, ILIL25,91656+0%

48Perry County, ILIL20,16052+0%

49Logan County, ILIL27,18250+0%

50Christian County, ILIL33,44350+0%

51Lee County, ILIL32,91450+0%

52Douglas County, ILIL19,88048+0%

53Bond County, ILIL16,95946+0%

54Crawford County, ILIL18,64846+0%

55Richland County, ILIL15,21945+0%

56Union County, ILIL16,65644+0%

57Fulton County, ILIL32,90144+0%

58Montgomery County, ILIL28,07644+0%

59Moultrie County, ILIL14,37143+0%

60De Witt County, ILIL15,11842+0%

61Lawrence County, ILIL13,79042+0%

62Bureau County, ILIL32,51041+0%

63Alexander County, ILIL4,57041+0%

64Menard County, ILIL11,86340+0%

65Livingston County, ILIL35,05738+0%

66Putnam County, ILIL5,61938+0%

67Johnson County, ILIL13,36337+0%

68Carroll County, ILIL15,41937+0%

69Piatt County, ILIL16,79137+0%

70Jo Daviess County, ILIL21,59437+0%

71Pulaski County, ILIL4,82037+0%

72Cass County, ILIL12,46336+0%

73Warren County, ILIL16,22235+0%

74Marshall County, ILIL11,47334+0%

75Clark County, ILIL15,11434+0%

76Cumberland County, ILIL10,20833+0%

77Edgar County, ILIL16,32332+0%

78Edwards County, ILIL5,89831+0%

79Clay County, ILIL12,79331+0%

80White County, ILIL13,25031+0%

81Fayette County, ILIL20,79030+0%

82Mercer County, ILIL15,22930+0%

83Shelby County, ILIL20,57630+0%

84Mason County, ILIL12,41130+0%

85Ford County, ILIL13,21629+0%

86Iroquois County, ILIL26,15028+0%

87Greene County, ILIL11,31327+0%

88Hardin County, ILIL3,58827+0%

89Washington County, ILIL13,56427+0%

90Hancock County, ILIL16,80325+0%

91Wayne County, ILIL15,88224+0%

92Brown County, ILIL6,40123+0%

93Scott County, ILIL4,86622+0%

94Stark County, ILIL5,31922+0%

95Henderson County, ILIL5,98422+0%

96Pike County, ILIL14,23121+0%

97Jasper County, ILIL9,03220+0%

98Calhoun County, ILIL4,30020+0%

99Gallatin County, ILIL4,61620+0%

100Hamilton County, ILIL7,85920+0%

101Schuyler County, ILIL6,65716+0%

102Pope County, ILIL3,67212+0%

SHOWING 1–102 OF 102

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES