RANKING · 2020 CENSUS · 99 SHOWN OF 99

Oldest housing stock, Iowa counties · 2020

Iowa counties ranked by oldest median year of construction (2020 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 1960.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2010 2020 2024

RANKPLACESTATEPOPMEDIAN YEAR BUILTVS 1990

01Adams County, IAIA3,61719440%

02Keokuk County, IAIA9,79719470%

03Howard County, IAIA9,41519490%

04Ida County, IAIA6,7771949+1%

05Montgomery County, IAIA10,0021949+1%

06Pocahontas County, IAIA6,81919490%

07Taylor County, IAIA5,8351950+1%

08Audubon County, IAIA5,5091950+1%

09Harrison County, IAIA14,6231950+1%

10Hardin County, IAIA16,45519510%

11Sac County, IAIA9,52519510%

12Worth County, IAIA7,3381951+1%

13Greene County, IAIA8,6581952+1%

14Monona County, IAIA8,5391952+1%

15Tama County, IAIA16,7961952+1%

16Cass County, IAIA12,96019530%

17Cherokee County, IAIA11,36919530%

18Butler County, IAIA14,04919540%

19Emmet County, IAIA9,10719540%

20Franklin County, IAIA9,8681954+1%

21Hamilton County, IAIA14,94419540%

22Page County, IAIA14,8561954+1%

23Wright County, IAIA12,80119540%

24Fayette County, IAIA19,0471955+1%

25Humboldt County, IAIA9,40919550%

26Lee County, IAIA32,30619550%

27Osceola County, IAIA5,9801955+1%

28Shelby County, IAIA11,6891955+1%

29Des Moines County, IAIA38,07719560%

30Mitchell County, IAIA10,6501956+1%

31Clinton County, IAIA46,00219560%

32Crawford County, IAIA16,23719560%

33Floyd County, IAIA14,90119560%

34Fremont County, IAIA6,52219560%

35Grundy County, IAIA12,36119560%

36Wapello County, IAIA35,21019560%

37Cerro Gordo County, IAIA42,37219570%

38Kossuth County, IAIA14,32219570%

39Webster County, IAIA36,83819570%

40Woodbury County, IAIA106,64919570%

41Hancock County, IAIA10,52819580%

42Marshall County, IAIA39,89019580%

43O'Brien County, IAIA14,2201958+1%

44Winneshiek County, IAIA19,7331958+1%

45Adair County, IAIA7,4031959+1%

46Calhoun County, IAIA9,5621959+1%

47Union County, IAIA11,8291960+1%

48Boone County, IAIA26,7991960+1%

49Clayton County, IAIA16,8451960+1%

50Mahaska County, IAIA21,88019600%

51Palo Alto County, IAIA8,8991960+1%

52Chickasaw County, IAIA11,6631962+1%

53Washington County, IAIA22,6671962+1%

54Wayne County, IAIA6,7381962+1%

55Appanoose County, IAIA12,07719630%

56Buena Vista County, IAIA20,4491963+1%

57Cedar County, IAIA18,3591963+1%

58Louisa County, IAIA10,41619630%

59Muscatine County, IAIA41,85319630%

60Winnebago County, IAIA10,25119630%

61Clay County, IAIA16,2021964+1%

62Henry County, IAIA19,34919640%

63Benton County, IAIA26,0041965+1%

64Carroll County, IAIA20,3031965+1%

65Lyon County, IAIA12,3541965+1%

66Black Hawk County, IAIA131,53219660%

67Bremer County, IAIA25,2961966+1%

68Jasper County, IAIA38,1531966+1%

69Jones County, IAIA21,2531966+1%

70Lucas County, IAIA8,8471966+1%

71Decatur County, IAIA7,6551967+1%

72Pottawattamie County, IAIA92,9961967+1%

73Delaware County, IAIA17,6741967+1%

74Guthrie County, IAIA10,7821968+1%

75Iowa County, IAIA16,5041968+1%

76Plymouth County, IAIA25,6971968+1%

77Poweshiek County, IAIA18,36819690%

78Buchanan County, IAIA20,8831969+1%

79Jackson County, IAIA19,2881969+1%

80Jefferson County, IAIA15,2911969+1%

81Davis County, IAIA9,2301970+1%

82Dubuque County, IAIA99,3811970+1%

83Van Buren County, IAIA7,1311970+1%

84Allamakee County, IAIA14,2381971+1%

85Ringgold County, IAIA4,6421971+1%

86Scott County, IAIA175,2591971+1%

87Clarke County, IAIA9,5741972+1%

88Mills County, IAIA14,7931972+1%

89Sioux County, IAIA36,7741972+1%

90Marion County, IAIA34,1921973+1%

91Monroe County, IAIA7,4061973+1%

92Linn County, IAIA232,0281976+1%

93Madison County, IAIA17,2701976+2%

94Dickinson County, IAIA18,0771977+1%

95Polk County, IAIA516,5461978+1%

96Story County, IAIA101,2911981+1%

97Warren County, IAIA57,3311981+1%

98Johnson County, IAIA160,0441987+1%

99Dallas County, IAIA118,4572003+2%

SHOWING 1–99 OF 99

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS