RANKING · 2010 CENSUS · 99 SHOWN OF 99

Largest households, Iowa counties · 2010

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, IAIA9,2302.76–

02Sioux County, IAIA36,7742.72–

03Louisa County, IAIA10,4162.67–

04Madison County, IAIA17,2702.64–

05Clarke County, IAIA9,5742.60–

06Henry County, IAIA19,3492.59–

07Warren County, IAIA57,3312.57–

08Dallas County, IAIA118,4572.56–

09Lyon County, IAIA12,3542.56–

10Mills County, IAIA14,7932.56–

11Benton County, IAIA26,0042.55–

12Muscatine County, IAIA41,8532.55–

13Marion County, IAIA34,1922.54–

14Plymouth County, IAIA25,6972.53–

15Buena Vista County, IAIA20,4492.52–

16Crawford County, IAIA16,2372.52–

17Woodbury County, IAIA106,6492.52–

18Franklin County, IAIA9,8682.50–

19Marshall County, IAIA39,8902.50–

20Buchanan County, IAIA20,8832.48–

21Lucas County, IAIA8,8472.47–

22Tama County, IAIA16,7962.47–

23Pottawattamie County, IAIA92,9962.46–

24Bremer County, IAIA25,2962.46–

25Polk County, IAIA516,5462.44–

26Washington County, IAIA22,6672.44–

27Mitchell County, IAIA10,6502.43–

28Cedar County, IAIA18,3592.43–

29Grundy County, IAIA12,3612.43–

30Ringgold County, IAIA4,6422.43–

31Clinton County, IAIA46,0022.42–

32Delaware County, IAIA17,6742.42–

33Harrison County, IAIA14,6232.42–

34Butler County, IAIA14,0492.40–

35Scott County, IAIA175,2592.40–

36Winneshiek County, IAIA19,7332.40–

37Dubuque County, IAIA99,3812.39–

38Iowa County, IAIA16,5042.39–

39Mahaska County, IAIA21,8802.39–

40Van Buren County, IAIA7,1312.39–

41Decatur County, IAIA7,6552.38–

42Black Hawk County, IAIA131,5322.38–

43Boone County, IAIA26,7992.38–

44Fayette County, IAIA19,0472.38–

45Fremont County, IAIA6,5222.38–

46Hancock County, IAIA10,5282.38–

47Osceola County, IAIA5,9802.38–

48Taylor County, IAIA5,8352.37–

49Allamakee County, IAIA14,2382.37–

50Hamilton County, IAIA14,9442.37–

51Lee County, IAIA32,3062.37–

52Linn County, IAIA232,0282.37–

53Shelby County, IAIA11,6892.37–

54Wapello County, IAIA35,2102.37–

55Wright County, IAIA12,8012.37–

56Des Moines County, IAIA38,0772.36–

57Montgomery County, IAIA10,0022.36–

58Floyd County, IAIA14,9012.35–

59Jackson County, IAIA19,2882.34–

60Jones County, IAIA21,2532.34–

61O'Brien County, IAIA14,2202.34–

62Story County, IAIA101,2912.34–

63Webster County, IAIA36,8382.33–

64Johnson County, IAIA160,0442.32–

65Appanoose County, IAIA12,0772.32–

66Guthrie County, IAIA10,7822.32–

67Monroe County, IAIA7,4062.32–

68Wayne County, IAIA6,7382.32–

69Clayton County, IAIA16,8452.31–

70Kossuth County, IAIA14,3222.31–

71Worth County, IAIA7,3382.31–

72Emmet County, IAIA9,1072.30–

73Jasper County, IAIA38,1532.30–

74Jefferson County, IAIA15,2912.30–

75Carroll County, IAIA20,3032.29–

76Howard County, IAIA9,4152.29–

77Union County, IAIA11,8292.28–

78Adair County, IAIA7,4032.28–

79Chickasaw County, IAIA11,6632.28–

80Hardin County, IAIA16,4552.28–

81Keokuk County, IAIA9,7972.28–

82Humboldt County, IAIA9,4092.27–

83Ida County, IAIA6,7772.27–

84Sac County, IAIA9,5252.27–

85Cass County, IAIA12,9602.26–

86Greene County, IAIA8,6582.25–

87Adams County, IAIA3,6172.24–

88Palo Alto County, IAIA8,8992.24–

89Poweshiek County, IAIA18,3682.23–

90Winnebago County, IAIA10,2512.23–

91Audubon County, IAIA5,5092.22–

92Cherokee County, IAIA11,3692.21–

93Clay County, IAIA16,2022.19–

94Page County, IAIA14,8562.19–

95Monona County, IAIA8,5392.18–

96Pocahontas County, IAIA6,8192.18–

97Cerro Gordo County, IAIA42,3722.17–

98Calhoun County, IAIA9,5622.12–

99Dickinson County, IAIA18,0772.02–

SHOWING 1–99 OF 99

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