RANKING · 2020 CENSUS · 102 SHOWN OF 102

Largest households, Illinois counties · 2020

Illinois counties ranked by average household size (2020 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 2010

01Kendall County, ILIL145,4703.07+4%

02Will County, ILIL712,2532.93−2%

03Kane County, ILIL525,7572.89−2%

04Boone County, ILIL53,5682.82−5%

05Calhoun County, ILIL4,3002.80+14%

06Lake County, ILIL719,3392.74−4%

07McHenry County, ILIL317,7512.70−4%

08DuPage County, ILIL934,2982.65−1%

09Pulaski County, ILIL4,8202.62+7%

10Alexander County, ILIL4,5702.60+9%

11DeKalb County, ILIL101,8352.59+3%

12Kankakee County, ILIL105,5252.59−2%

13Cook County, ILIL5,194,6252.55−3%

14Douglas County, ILIL19,8802.55−2%

15Greene County, ILIL11,3132.55+7%

16Jersey County, ILIL21,1602.55−1%

17Woodford County, ILIL38,1112.55−2%

18Monroe County, ILIL34,8402.52−3%

19Cumberland County, ILIL10,2082.52−5%

20Fayette County, ILIL20,7902.51−6%

21Grundy County, ILIL54,0522.51−7%

22Hardin County, ILIL3,5882.50+10%

23Jasper County, ILIL9,0322.50+4%

24Scott County, ILIL4,8662.50−0%

25McLean County, ILIL171,4192.47−1%

26St. Clair County, ILIL250,7082.46−4%

27Massac County, ILIL13,5022.44+2%

28Pope County, ILIL3,6722.44+6%

29Effingham County, ILIL34,5192.43−4%

30Johnson County, ILIL13,3632.43+8%

31Clinton County, ILIL37,1282.42−2%

32Henry County, ILIL48,0952.42−1%

33Piatt County, ILIL16,7912.42−3%

34Pike County, ILIL14,2312.42+0%

35Jefferson County, ILIL36,1472.41+0%

36Tazewell County, ILIL130,0492.41−1%

37Winnebago County, ILIL283,6742.41−6%

38Cass County, ILIL12,4632.40−8%

39Union County, ILIL16,6562.40+1%

40Hamilton County, ILIL7,8592.39+0%

41Macoupin County, ILIL43,7482.39+0%

42Madison County, ILIL263,1102.39−2%

43Ogle County, ILIL51,3992.39−6%

44Peoria County, ILIL178,5532.39+0%

45Vermilion County, ILIL71,2592.39−4%

46Adams County, ILIL64,2672.36−1%

47Franklin County, ILIL36,9162.36−2%

48Mercer County, ILIL15,2292.36+0%

49Wabash County, ILIL10,9072.36−4%

50Bureau County, ILIL32,5102.35−1%

51Moultrie County, ILIL14,3712.35−7%

52Putnam County, ILIL5,6192.35−0%

53Richland County, ILIL15,2192.35−2%

54Whiteside County, ILIL54,1212.35−4%

55Champaign County, ILIL209,9722.34+1%

56LaSalle County, ILIL107,7732.34−5%

57Shelby County, ILIL20,5762.34−3%

58Hancock County, ILIL16,8032.33−2%

59Livingston County, ILIL35,0572.33−2%

60Menard County, ILIL11,8632.33−6%

61Randolph County, ILIL29,9212.33−2%

62Warren County, ILIL16,2222.33−4%

63Bond County, ILIL16,9592.32−17%

64Edwards County, ILIL5,8982.32−1%

65McDonough County, ILIL25,9162.32+11%

66Williamson County, ILIL67,2252.32−5%

67Macon County, ILIL99,3002.31−3%

68De Witt County, ILIL15,1182.30−6%

69Stark County, ILIL5,3192.30−8%

70Saline County, ILIL22,7722.29−1%

71Clark County, ILIL15,1142.29−4%

72Clay County, ILIL12,7932.29−7%

73Fulton County, ILIL32,9012.29−2%

74Marshall County, ILIL11,4732.29−5%

75Sangamon County, ILIL194,1702.28−3%

76Rock Island County, ILIL141,8692.28−4%

77Iroquois County, ILIL26,1502.28−5%

78Marion County, ILIL36,3822.28−6%

79Morgan County, ILIL32,5152.28−0%

80Washington County, ILIL13,5642.28−5%

81Wayne County, ILIL15,8822.28−2%

82Brown County, ILIL6,4012.27+5%

83Logan County, ILIL27,1822.27+0%

84Lee County, ILIL32,9142.26−10%

85Coles County, ILIL46,6072.25+3%

86Knox County, ILIL47,7672.24+1%

87Mason County, ILIL12,4112.24−2%

88Schuyler County, ILIL6,6572.23−10%

89Christian County, ILIL33,4432.22−5%

90Stephenson County, ILIL43,2202.22−7%

91Henderson County, ILIL5,9842.21−3%

92Jackson County, ILIL52,5012.21−3%

93Montgomery County, ILIL28,0762.20−6%

94White County, ILIL13,2502.20−1%

95Ford County, ILIL13,2162.19−8%

96Gallatin County, ILIL4,6162.19−9%

97Lawrence County, ILIL13,7902.18−3%

98Perry County, ILIL20,1602.17−9%

99Edgar County, ILIL16,3232.16−7%

100Crawford County, ILIL18,6482.13−14%

101Carroll County, ILIL15,4192.12−3%

102Jo Daviess County, ILIL21,5942.11−6%

SHOWING 1–102 OF 102

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