RANKING · 2024 ACS · 102 SHOWN OF 102

Largest households, Illinois counties

Illinois counties ranked by average household size (2023 ACS). 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

RELATEDMost expensive homes Cheapest homes Highest median rent Lowest median rent Highest homeownership rate Highest renter share

YEAR2010 2020 2024

RANKPLACESTATEPOPAVERAGE HOUSEHOLD SIZEVS 2000

01Calhoun County, ILIL4,3003.41–

02Kendall County, ILIL145,4703.03–

03Will County, ILIL712,2532.84–

04Johnson County, ILIL13,3632.82–

05Kane County, ILIL525,7572.77–

06Boone County, ILIL53,5682.72–

07Lake County, ILIL719,3392.69–

08McHenry County, ILIL317,7512.64–

09DuPage County, ILIL934,2982.61–

10Fayette County, ILIL20,7902.60–

11Pope County, ILIL3,6722.59–

12Greene County, ILIL11,3132.58–

13Grundy County, ILIL54,0522.57–

14Jersey County, ILIL21,1602.54–

15Woodford County, ILIL38,1112.54–

16Monroe County, ILIL34,8402.51–

17Douglas County, ILIL19,8802.51–

18Alexander County, ILIL4,5702.50–

19Massac County, ILIL13,5022.49–

20Pulaski County, ILIL4,8202.49–

21Lawrence County, ILIL13,7902.48–

22Kankakee County, ILIL105,5252.48–

23St. Clair County, ILIL250,7082.47–

24Macoupin County, ILIL43,7482.47–

25Cass County, ILIL12,4632.46–

26Ogle County, ILIL51,3992.45–

27Cumberland County, ILIL10,2082.44–

28Effingham County, ILIL34,5192.44–

29Cook County, ILIL5,194,6252.43–

30DeKalb County, ILIL101,8352.42–

31Jasper County, ILIL9,0322.42–

32Moultrie County, ILIL14,3712.42–

33Winnebago County, ILIL283,6742.41–

34Clinton County, ILIL37,1282.39–

35Clay County, ILIL12,7932.39–

36Piatt County, ILIL16,7912.39–

37Scott County, ILIL4,8662.39–

38Bond County, ILIL16,9592.38–

39Jefferson County, ILIL36,1472.37–

40Pike County, ILIL14,2312.37–

41Richland County, ILIL15,2192.37–

42Henry County, ILIL48,0952.36–

43Madison County, ILIL263,1102.35–

44Tazewell County, ILIL130,0492.35–

45Union County, ILIL16,6562.35–

46Christian County, ILIL33,4432.34–

47Lee County, ILIL32,9142.34–

48Morgan County, ILIL32,5152.34–

49White County, ILIL13,2502.34–

50LaSalle County, ILIL107,7732.33–

51Marion County, ILIL36,3822.33–

52Mercer County, ILIL15,2292.33–

53Whiteside County, ILIL54,1212.33–

54Bureau County, ILIL32,5102.31–

55McLean County, ILIL171,4192.31–

56Vermilion County, ILIL71,2592.31–

57Washington County, ILIL13,5642.31–

58Wayne County, ILIL15,8822.31–

59Crawford County, ILIL18,6482.30–

60De Witt County, ILIL15,1182.30–

61Hamilton County, ILIL7,8592.30–

62Perry County, ILIL20,1602.30–

63Shelby County, ILIL20,5762.30–

64Wabash County, ILIL10,9072.30–

65Clark County, ILIL15,1142.29–

66Livingston County, ILIL35,0572.29–

67Menard County, ILIL11,8632.29–

68Franklin County, ILIL36,9162.28–

69Gallatin County, ILIL4,6162.28–

70Henderson County, ILIL5,9842.27–

71Champaign County, ILIL209,9722.27–

72Edwards County, ILIL5,8982.27–

73Iroquois County, ILIL26,1502.27–

74Macon County, ILIL99,3002.27–

75Montgomery County, ILIL28,0762.27–

76Putnam County, ILIL5,6192.27–

77Stark County, ILIL5,3192.27–

78Warren County, ILIL16,2222.27–

79Saline County, ILIL22,7722.26–

80Sangamon County, ILIL194,1702.25–

81Adams County, ILIL64,2672.25–

82Hardin County, ILIL3,5882.25–

83Randolph County, ILIL29,9212.25–

84Fulton County, ILIL32,9012.24–

85Peoria County, ILIL178,5532.24–

86Rock Island County, ILIL141,8692.23–

87Ford County, ILIL13,2162.23–

88Hancock County, ILIL16,8032.23–

89Marshall County, ILIL11,4732.23–

90Williamson County, ILIL67,2252.23–

91Stephenson County, ILIL43,2202.22–

92Mason County, ILIL12,4112.17–

93Logan County, ILIL27,1822.16–

94Schuyler County, ILIL6,6572.16–

95Brown County, ILIL6,4012.15–

96Knox County, ILIL47,7672.15–

97Edgar County, ILIL16,3232.13–

98Jackson County, ILIL52,5012.13–

99Carroll County, ILIL15,4192.12–

100Jo Daviess County, ILIL21,5942.08–

101Coles County, ILIL46,6072.06–

102McDonough County, ILIL25,9162.05–

SHOWING 1–102 OF 102

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