RANKING · 2024 ACS · 99 SHOWN OF 99

Largest households, Iowa counties

Iowa counties ranked by average household size (2024 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 2.33. Biggest climber in the top 100 since 2020: Shelby County, IA, up 36 places to #37.

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SAME RANKING BYCities States Metros ZIP codes

YEAR2010 2020 2024

RANKPLACESTATEPOPAVERAGE HOUSEHOLD SIZEVS 2010

01Davis County, IAIA9,2302.83+3%

02▲6Lyon County, IAIA12,3542.68+5%

03Sioux County, IAIA36,7742.67−2%

04▼2Mills County, IAIA14,7932.63+3%

05▲10Buena Vista County, IAIA20,4492.62+4%

06▲4Warren County, IAIA57,3312.55−1%

07▲5Woodbury County, IAIA106,6492.54+1%

08▼1Dallas County, IAIA118,4572.53−1%

09▲7Marshall County, IAIA39,8902.510%

10▼5Crawford County, IAIA16,2372.50−1%

11▲19Madison County, IAIA17,2702.50−5%

12▲20Wayne County, IAIA6,7382.50+8%

13▲7Benton County, IAIA26,0042.49−2%

14▼10Buchanan County, IAIA20,8832.490%

15▼4Louisa County, IAIA10,4162.49−7%

16▲5Washington County, IAIA22,6672.48+2%

17▲30Van Buren County, IAIA7,1312.47+3%

18▲13Plymouth County, IAIA25,6972.46−3%

19Tama County, IAIA16,7962.460%

20▲18Wapello County, IAIA35,2102.46+4%

21▲14Howard County, IAIA9,4152.45+7%

22▲1Bremer County, IAIA25,2962.44−1%

23▲2Mahaska County, IAIA21,8802.43+2%

24▼6Pottawattamie County, IAIA92,9962.41−2%

25▲29Keokuk County, IAIA9,7972.41+6%

26▼17Muscatine County, IAIA41,8532.41−5%

27▼10Polk County, IAIA516,5462.41−1%

28▲25Butler County, IAIA14,0492.400%

29▼3Henry County, IAIA19,3492.40−7%

30▼1Jasper County, IAIA38,1532.40+4%

31▲11Jones County, IAIA21,2532.40+3%

32▲19Marion County, IAIA34,1922.40−6%

33▲1Boone County, IAIA26,7992.390%

34▲14Grundy County, IAIA12,3612.39−2%

35▲11Monroe County, IAIA7,4062.38+3%

36▼12Cedar County, IAIA18,3592.37−2%

37▲36Shelby County, IAIA11,6892.370%

38▲31Harrison County, IAIA14,6232.36−2%

39▲31O'Brien County, IAIA14,2202.36+1%

40▼34Ringgold County, IAIA4,6422.36−3%

41▲35Decatur County, IAIA7,6552.35−1%

42▼20Delaware County, IAIA17,6742.35−3%

43▼16Linn County, IAIA232,0282.35−1%

44▲34Wright County, IAIA12,8012.35−1%

45▲4Clarke County, IAIA9,5742.34−10%

46▼7Johnson County, IAIA160,0442.34+1%

47▼3Clinton County, IAIA46,0022.34−3%

48▼11Iowa County, IAIA16,5042.34−2%

49▼35Scott County, IAIA175,2592.34−3%

50▲7Chickasaw County, IAIA11,6632.33+2%

51▲15Lucas County, IAIA8,8472.33−6%

52▼9Taylor County, IAIA5,8352.32−2%

53▲15Allamakee County, IAIA14,2382.32−2%

54▲20Floyd County, IAIA14,9012.32−1%

55▼14Franklin County, IAIA9,8682.32−7%

56▼6Jackson County, IAIA19,2882.32−1%

57▼21Black Hawk County, IAIA131,5322.31−3%

58▼30Dubuque County, IAIA99,3812.31−3%

59▲36Pocahontas County, IAIA6,8192.31+6%

60▼20Appanoose County, IAIA12,0772.30−1%

61▲28Adams County, IAIA3,6172.29+2%

62▼17Guthrie County, IAIA10,7822.29−1%

63▼2Worth County, IAIA7,3382.29−1%

64▼8Union County, IAIA11,8292.280%

65▲21Calhoun County, IAIA9,5622.28+8%

66▼4Carroll County, IAIA20,3032.280%

67▼34Hamilton County, IAIA14,9442.28−4%

68▼8Fremont County, IAIA6,5222.27−5%

69▲2Hardin County, IAIA16,4552.270%

70▲5Osceola County, IAIA5,9802.27−5%

71▼16Palo Alto County, IAIA8,8992.26+1%

72▼5Story County, IAIA101,2912.26−3%

73▼21Mitchell County, IAIA10,6502.25−7%

74▲14Adair County, IAIA7,4032.25−1%

75▼3Humboldt County, IAIA9,4092.24−1%

76▼13Clayton County, IAIA16,8452.23−3%

77▲2Hancock County, IAIA10,5282.23−6%

78▲3Page County, IAIA14,8562.23+2%

79▲6Winneshiek County, IAIA19,7332.23−7%

80▲17Cherokee County, IAIA11,3692.220%

81▲11Clay County, IAIA16,2022.22+1%

82▼24Fayette County, IAIA19,0472.22−7%

83▼19Ida County, IAIA6,7772.22−2%

84▼19Lee County, IAIA32,3062.21−7%

85▼3Sac County, IAIA9,5252.21−3%

86▲7Webster County, IAIA36,8382.21−5%

87▼28Des Moines County, IAIA38,0772.20−7%

88▼1Cass County, IAIA12,9602.20−3%

89▼6Greene County, IAIA8,6582.19−3%

90▼10Montgomery County, IAIA10,0022.18−8%

91▼14Kossuth County, IAIA14,3222.17−6%

92▼2Poweshiek County, IAIA18,3682.16−3%

93▲1Monona County, IAIA8,5392.16−1%

94▼10Winnebago County, IAIA10,2512.16−3%

95▲1Emmet County, IAIA9,1072.15−7%

96▼5Cerro Gordo County, IAIA42,3722.13−2%

97▲1Audubon County, IAIA5,5092.11−5%

98▼85Jefferson County, IAIA15,2912.11−8%

99Dickinson County, IAIA18,0772.00−1%

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