RANKING · 2024 ACS · 99 SHOWN OF 99

Largest households, Iowa counties

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, IAIA9,2302.83–

02Lyon County, IAIA12,3542.68–

03Sioux County, IAIA36,7742.67–

04Mills County, IAIA14,7932.63–

05Buena Vista County, IAIA20,4492.62–

06Warren County, IAIA57,3312.55–

07Woodbury County, IAIA106,6492.54–

08Dallas County, IAIA118,4572.53–

09Marshall County, IAIA39,8902.51–

10Crawford County, IAIA16,2372.50–

11Madison County, IAIA17,2702.50–

12Wayne County, IAIA6,7382.50–

13Benton County, IAIA26,0042.49–

14Buchanan County, IAIA20,8832.49–

15Louisa County, IAIA10,4162.49–

16Washington County, IAIA22,6672.48–

17Van Buren County, IAIA7,1312.47–

18Plymouth County, IAIA25,6972.46–

19Tama County, IAIA16,7962.46–

20Wapello County, IAIA35,2102.46–

21Howard County, IAIA9,4152.45–

22Bremer County, IAIA25,2962.44–

23Mahaska County, IAIA21,8802.43–

24Pottawattamie County, IAIA92,9962.41–

25Keokuk County, IAIA9,7972.41–

26Muscatine County, IAIA41,8532.41–

27Polk County, IAIA516,5462.41–

28Butler County, IAIA14,0492.40–

29Henry County, IAIA19,3492.40–

30Jasper County, IAIA38,1532.40–

31Jones County, IAIA21,2532.40–

32Marion County, IAIA34,1922.40–

33Boone County, IAIA26,7992.39–

34Grundy County, IAIA12,3612.39–

35Monroe County, IAIA7,4062.38–

36Cedar County, IAIA18,3592.37–

37Shelby County, IAIA11,6892.37–

38Harrison County, IAIA14,6232.36–

39O'Brien County, IAIA14,2202.36–

40Ringgold County, IAIA4,6422.36–

41Decatur County, IAIA7,6552.35–

42Delaware County, IAIA17,6742.35–

43Linn County, IAIA232,0282.35–

44Wright County, IAIA12,8012.35–

45Clarke County, IAIA9,5742.34–

46Johnson County, IAIA160,0442.34–

47Clinton County, IAIA46,0022.34–

48Iowa County, IAIA16,5042.34–

49Scott County, IAIA175,2592.34–

50Chickasaw County, IAIA11,6632.33–

51Lucas County, IAIA8,8472.33–

52Taylor County, IAIA5,8352.32–

53Allamakee County, IAIA14,2382.32–

54Floyd County, IAIA14,9012.32–

55Franklin County, IAIA9,8682.32–

56Jackson County, IAIA19,2882.32–

57Black Hawk County, IAIA131,5322.31–

58Dubuque County, IAIA99,3812.31–

59Pocahontas County, IAIA6,8192.31–

60Appanoose County, IAIA12,0772.30–

61Adams County, IAIA3,6172.29–

62Guthrie County, IAIA10,7822.29–

63Worth County, IAIA7,3382.29–

64Union County, IAIA11,8292.28–

65Calhoun County, IAIA9,5622.28–

66Carroll County, IAIA20,3032.28–

67Hamilton County, IAIA14,9442.28–

68Fremont County, IAIA6,5222.27–

69Hardin County, IAIA16,4552.27–

70Osceola County, IAIA5,9802.27–

71Palo Alto County, IAIA8,8992.26–

72Story County, IAIA101,2912.26–

73Mitchell County, IAIA10,6502.25–

74Adair County, IAIA7,4032.25–

75Humboldt County, IAIA9,4092.24–

76Clayton County, IAIA16,8452.23–

77Hancock County, IAIA10,5282.23–

78Page County, IAIA14,8562.23–

79Winneshiek County, IAIA19,7332.23–

80Cherokee County, IAIA11,3692.22–

81Clay County, IAIA16,2022.22–

82Fayette County, IAIA19,0472.22–

83Ida County, IAIA6,7772.22–

84Lee County, IAIA32,3062.21–

85Sac County, IAIA9,5252.21–

86Webster County, IAIA36,8382.21–

87Des Moines County, IAIA38,0772.20–

88Cass County, IAIA12,9602.20–

89Greene County, IAIA8,6582.19–

90Montgomery County, IAIA10,0022.18–

91Kossuth County, IAIA14,3222.17–

92Poweshiek County, IAIA18,3682.16–

93Monona County, IAIA8,5392.16–

94Winnebago County, IAIA10,2512.16–

95Emmet County, IAIA9,1072.15–

96Cerro Gordo County, IAIA42,3722.13–

97Audubon County, IAIA5,5092.11–

98Jefferson County, IAIA15,2912.11–

99Dickinson County, IAIA18,0772.00–

SHOWING 1–99 OF 99

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