RANKING · 2010 CENSUS · 102 SHOWN OF 102

Largest households, Illinois counties · 2010

Illinois counties ranked by average household size (2010 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 –

01Will County, ILIL712,2533.00–

02Boone County, ILIL53,5682.98–

03Kane County, ILIL525,7572.94–

04Kendall County, ILIL145,4702.94–

05Lake County, ILIL719,3392.84–

06McHenry County, ILIL317,7512.82–

07Bond County, ILIL16,9592.78–

08Grundy County, ILIL54,0522.71–

09DuPage County, ILIL934,2982.68–

10Fayette County, ILIL20,7902.66–

11Cumberland County, ILIL10,2082.65–

12Cook County, ILIL5,194,6252.63–

13Kankakee County, ILIL105,5252.63–

14Douglas County, ILIL19,8802.61–

15Woodford County, ILIL38,1112.61–

16Monroe County, ILIL34,8402.60–

17Cass County, ILIL12,4632.60–

18Jersey County, ILIL21,1602.57–

19Winnebago County, ILIL283,6742.56–

20St. Clair County, ILIL250,7082.55–

21Ogle County, ILIL51,3992.55–

22Moultrie County, ILIL14,3712.53–

23DeKalb County, ILIL101,8352.52–

24Effingham County, ILIL34,5192.52–

25Lee County, ILIL32,9142.52–

26Scott County, ILIL4,8662.51–

27McLean County, ILIL171,4192.50–

28Vermilion County, ILIL71,2592.50–

29Piatt County, ILIL16,7912.49–

30Stark County, ILIL5,3192.49–

31Menard County, ILIL11,8632.48–

32Schuyler County, ILIL6,6572.48–

33Crawford County, ILIL18,6482.47–

34Clinton County, ILIL37,1282.47–

35LaSalle County, ILIL107,7732.47–

36Wabash County, ILIL10,9072.46–

37Calhoun County, ILIL4,3002.45–

38Clay County, ILIL12,7932.45–

39De Witt County, ILIL15,1182.45–

40Whiteside County, ILIL54,1212.45–

41Henry County, ILIL48,0952.44–

42Madison County, ILIL263,1102.44–

43Pulaski County, ILIL4,8202.44–

44Marion County, ILIL36,3822.43–

45Tazewell County, ILIL130,0492.43–

46Williamson County, ILIL67,2252.43–

47Pike County, ILIL14,2312.42–

48Shelby County, ILIL20,5762.42–

49Warren County, ILIL16,2222.42–

50Franklin County, ILIL36,9162.41–

51Iroquois County, ILIL26,1502.41–

52Marshall County, ILIL11,4732.41–

53Gallatin County, ILIL4,6162.40–

54Jasper County, ILIL9,0322.40–

55Jefferson County, ILIL36,1472.40–

56Massac County, ILIL13,5022.40–

57Stephenson County, ILIL43,2202.40–

58Washington County, ILIL13,5642.40–

59Hamilton County, ILIL7,8592.39–

60Macon County, ILIL99,3002.39–

61Macoupin County, ILIL43,7482.39–

62Richland County, ILIL15,2192.39–

63Adams County, ILIL64,2672.38–

64Alexander County, ILIL4,5702.38–

65Bureau County, ILIL32,5102.38–

66Clark County, ILIL15,1142.38–

67Ford County, ILIL13,2162.38–

68Greene County, ILIL11,3132.38–

69Hancock County, ILIL16,8032.38–

70Livingston County, ILIL35,0572.38–

71Peoria County, ILIL178,5532.38–

72Perry County, ILIL20,1602.38–

73Randolph County, ILIL29,9212.38–

74Union County, ILIL16,6562.38–

75Rock Island County, ILIL141,8692.37–

76Mercer County, ILIL15,2292.36–

77Putnam County, ILIL5,6192.36–

78Edwards County, ILIL5,8982.35–

79Sangamon County, ILIL194,1702.34–

80Christian County, ILIL33,4432.34–

81Fulton County, ILIL32,9012.34–

82Montgomery County, ILIL28,0762.34–

83Wayne County, ILIL15,8822.33–

84Champaign County, ILIL209,9722.32–

85Edgar County, ILIL16,3232.32–

86Saline County, ILIL22,7722.31–

87Pope County, ILIL3,6722.31–

88Jackson County, ILIL52,5012.29–

89Morgan County, ILIL32,5152.29–

90Henderson County, ILIL5,9842.28–

91Hardin County, ILIL3,5882.28–

92Mason County, ILIL12,4112.28–

93Logan County, ILIL27,1822.27–

94Lawrence County, ILIL13,7902.24–

95Jo Daviess County, ILIL21,5942.24–

96Johnson County, ILIL13,3632.24–

97White County, ILIL13,2502.23–

98Knox County, ILIL47,7672.21–

99Carroll County, ILIL15,4192.18–

100Coles County, ILIL46,6072.18–

101Brown County, ILIL6,4012.17–

102McDonough County, ILIL25,9162.09–

SHOWING 1–102 OF 102

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