RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest households, Iowa counties · 2020

Iowa counties ranked by average household size (2023 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

IowaAll 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

01Davis County, IAIA9,2302.79–

02Mills County, IAIA14,7932.67–

03Sioux County, IAIA36,7742.64–

04Buchanan County, IAIA20,8832.60–

05Crawford County, IAIA16,2372.57–

06Ringgold County, IAIA4,6422.55–

07Dallas County, IAIA118,4572.54–

08Lyon County, IAIA12,3542.54–

09Muscatine County, IAIA41,8532.54–

10Warren County, IAIA57,3312.54–

11Louisa County, IAIA10,4162.53–

12Woodbury County, IAIA106,6492.53–

13Jefferson County, IAIA15,2912.52–

14Scott County, IAIA175,2592.51–

15Buena Vista County, IAIA20,4492.50–

16Marshall County, IAIA39,8902.50–

17Polk County, IAIA516,5462.49–

18Pottawattamie County, IAIA92,9962.48–

19Tama County, IAIA16,7962.46–

20Benton County, IAIA26,0042.45–

21Washington County, IAIA22,6672.45–

22Delaware County, IAIA17,6742.44–

23Bremer County, IAIA25,2962.43–

24Cedar County, IAIA18,3592.43–

25Mahaska County, IAIA21,8802.43–

26Henry County, IAIA19,3492.42–

27Linn County, IAIA232,0282.42–

28Dubuque County, IAIA99,3812.41–

29Jasper County, IAIA38,1532.41–

30Madison County, IAIA17,2702.41–

31Plymouth County, IAIA25,6972.41–

32Wayne County, IAIA6,7382.41–

33Hamilton County, IAIA14,9442.40–

34Boone County, IAIA26,7992.39–

35Howard County, IAIA9,4152.39–

36Black Hawk County, IAIA131,5322.38–

37Iowa County, IAIA16,5042.38–

38Wapello County, IAIA35,2102.38–

39Johnson County, IAIA160,0442.37–

40Appanoose County, IAIA12,0772.37–

41Franklin County, IAIA9,8682.37–

42Jones County, IAIA21,2532.37–

43Taylor County, IAIA5,8352.36–

44Clinton County, IAIA46,0022.36–

45Guthrie County, IAIA10,7822.36–

46Monroe County, IAIA7,4062.36–

47Van Buren County, IAIA7,1312.36–

48Grundy County, IAIA12,3612.34–

49Clarke County, IAIA9,5742.33–

50Jackson County, IAIA19,2882.33–

51Marion County, IAIA34,1922.33–

52Mitchell County, IAIA10,6502.32–

53Butler County, IAIA14,0492.32–

54Keokuk County, IAIA9,7972.32–

55Palo Alto County, IAIA8,8992.32–

56Union County, IAIA11,8292.31–

57Chickasaw County, IAIA11,6632.31–

58Fayette County, IAIA19,0472.31–

59Des Moines County, IAIA38,0772.29–

60Fremont County, IAIA6,5222.29–

61Worth County, IAIA7,3382.29–

62Carroll County, IAIA20,3032.28–

63Clayton County, IAIA16,8452.28–

64Ida County, IAIA6,7772.27–

65Lee County, IAIA32,3062.27–

66Lucas County, IAIA8,8472.27–

67Story County, IAIA101,2912.27–

68Allamakee County, IAIA14,2382.26–

69Harrison County, IAIA14,6232.26–

70O'Brien County, IAIA14,2202.26–

71Hardin County, IAIA16,4552.24–

72Humboldt County, IAIA9,4092.24–

73Shelby County, IAIA11,6892.24–

74Floyd County, IAIA14,9012.23–

75Osceola County, IAIA5,9802.23–

76Decatur County, IAIA7,6552.22–

77Kossuth County, IAIA14,3222.22–

78Wright County, IAIA12,8012.22–

79Hancock County, IAIA10,5282.19–

80Montgomery County, IAIA10,0022.19–

81Page County, IAIA14,8562.19–

82Sac County, IAIA9,5252.19–

83Greene County, IAIA8,6582.18–

84Winnebago County, IAIA10,2512.17–

85Winneshiek County, IAIA19,7332.17–

86Calhoun County, IAIA9,5622.16–

87Cass County, IAIA12,9602.16–

88Adair County, IAIA7,4032.15–

89Adams County, IAIA3,6172.15–

90Poweshiek County, IAIA18,3682.14–

91Cerro Gordo County, IAIA42,3722.14–

92Clay County, IAIA16,2022.14–

93Webster County, IAIA36,8382.14–

94Monona County, IAIA8,5392.12–

95Pocahontas County, IAIA6,8192.11–

96Emmet County, IAIA9,1072.09–

97Cherokee County, IAIA11,3692.04–

98Audubon County, IAIA5,5092.01–

99Dickinson County, IAIA18,0772.01–

SHOWING 1–99 OF 99

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