RANKING · 2024 ACS · 102 SHOWN OF 102

Largest households, Illinois counties

Illinois counties ranked by average household size (2024 ACS). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 2.33. Biggest climber in the top 100 since 2020: Lawrence County, IL, up 76 places to #21.

IllinoisAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR2010 2020 2024

RANKPLACESTATEPOPAVERAGE HOUSEHOLD SIZEVS 2010

01▲4Calhoun County, ILIL4,3003.41+39%

02▼1Kendall County, ILIL145,4703.03+3%

03▼1Will County, ILIL712,2532.84−5%

04▲26Johnson County, ILIL13,3632.82+26%

05▼2Kane County, ILIL525,7572.77−6%

06▼2Boone County, ILIL53,5682.72−9%

07▼1Lake County, ILIL719,3392.69−5%

08▼1McHenry County, ILIL317,7512.64−6%

09▼1DuPage County, ILIL934,2982.61−3%

10▲10Fayette County, ILIL20,7902.60−2%

11▲17Pope County, ILIL3,6722.59+12%

12▲3Greene County, ILIL11,3132.58+8%

13▲8Grundy County, ILIL54,0522.57−5%

14▲2Jersey County, ILIL21,1602.54−1%

15▲2Woodford County, ILIL38,1112.54−3%

16▲2Monroe County, ILIL34,8402.51−3%

17▼3Douglas County, ILIL19,8802.51−4%

18▼8Alexander County, ILIL4,5702.50+5%

19▲8Massac County, ILIL13,5022.49+4%

20▼11Pulaski County, ILIL4,8202.49+2%

21▲76Lawrence County, ILIL13,7902.48+11%

22▼10Kankakee County, ILIL105,5252.48−6%

23▲3St. Clair County, ILIL250,7082.47−3%

24▲17Macoupin County, ILIL43,7482.47+3%

25▲13Cass County, ILIL12,4632.46−5%

26▲17Ogle County, ILIL51,3992.45−4%

27▼8Cumberland County, ILIL10,2082.44−8%

28▲1Effingham County, ILIL34,5192.44−3%

29▼16Cook County, ILIL5,194,6252.43−8%

30▼19DeKalb County, ILIL101,8352.42−4%

31▼8Jasper County, ILIL9,0322.42+1%

32▲19Moultrie County, ILIL14,3712.42−4%

33▲4Winnebago County, ILIL283,6742.41−6%

34▼3Clinton County, ILIL37,1282.39−3%

35▲37Clay County, ILIL12,7932.39−2%

36▼3Piatt County, ILIL16,7912.39−4%

37▼13Scott County, ILIL4,8662.39−5%

38▲25Bond County, ILIL16,9592.38−14%

39▼4Jefferson County, ILIL36,1472.37−1%

40▼6Pike County, ILIL14,2312.37−2%

41▲12Richland County, ILIL15,2192.37−1%

42▼10Henry County, ILIL48,0952.36−3%

43▼1Madison County, ILIL263,1102.35−4%

44▼8Tazewell County, ILIL130,0492.35−3%

45▼6Union County, ILIL16,6562.35−1%

46▲43Christian County, ILIL33,4432.340%

47▲37Lee County, ILIL32,9142.34−7%

48▲31Morgan County, ILIL32,5152.34+2%

49▲45White County, ILIL13,2502.34+5%

50▲6LaSalle County, ILIL107,7732.33−6%

51▲27Marion County, ILIL36,3822.33−4%

52▼4Mercer County, ILIL15,2292.33−1%

53▲1Whiteside County, ILIL54,1212.33−5%

54▼4Bureau County, ILIL32,5102.31−3%

55▼30McLean County, ILIL171,4192.31−8%

56▼11Vermilion County, ILIL71,2592.31−8%

57▲23Washington County, ILIL13,5642.31−4%

58▲23Wayne County, ILIL15,8822.31−1%

59▲41Crawford County, ILIL18,6482.30−7%

60▲8De Witt County, ILIL15,1182.30−6%

61▼21Hamilton County, ILIL7,8592.30−4%

62▲36Perry County, ILIL20,1602.30−3%

63▼6Shelby County, ILIL20,5762.30−5%

64▼15Wabash County, ILIL10,9072.30−7%

65▲6Clark County, ILIL15,1142.29−4%

66▼7Livingston County, ILIL35,0572.29−4%

67▼7Menard County, ILIL11,8632.29−8%

68▼21Franklin County, ILIL36,9162.28−5%

69▲27Gallatin County, ILIL4,6162.28−5%

70▲21Henderson County, ILIL5,9842.270%

71▼16Champaign County, ILIL209,9722.27−2%

72▼8Edwards County, ILIL5,8982.27−3%

73▲4Iroquois County, ILIL26,1502.27−6%

74▼7Macon County, ILIL99,3002.27−5%

75▲18Montgomery County, ILIL28,0762.27−3%

76▼24Putnam County, ILIL5,6192.27−4%

77▼8Stark County, ILIL5,3192.27−9%

78▼16Warren County, ILIL16,2222.27−6%

79▼9Saline County, ILIL22,7722.26−2%

80▼5Sangamon County, ILIL194,1702.25−4%

81▼35Adams County, ILIL64,2672.25−5%

82▼60Hardin County, ILIL3,5882.25−1%

83▼22Randolph County, ILIL29,9212.25−5%

84▼11Fulton County, ILIL32,9012.24−4%

85▼41Peoria County, ILIL178,5532.24−6%

86▼10Rock Island County, ILIL141,8692.23−6%

87▲8Ford County, ILIL13,2162.23−6%

88▼30Hancock County, ILIL16,8032.23−6%

89▼15Marshall County, ILIL11,4732.23−7%

90▼24Williamson County, ILIL67,2252.23−8%

91▼1Stephenson County, ILIL43,2202.22−7%

92▼5Mason County, ILIL12,4112.17−5%

93▼10Logan County, ILIL27,1822.16−5%

94▼6Schuyler County, ILIL6,6572.16−13%

95▼13Brown County, ILIL6,4012.15−1%

96▼10Knox County, ILIL47,7672.15−3%

97▲2Edgar County, ILIL16,3232.13−8%

98▼6Jackson County, ILIL52,5012.13−7%

99▲2Carroll County, ILIL15,4192.12−3%

100▲2Jo Daviess County, ILIL21,5942.08−7%

101▼16Coles County, ILIL46,6072.06−6%

102▼37McDonough County, ILIL25,9162.05−2%

SHOWING 1–102 OF 102

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES