RANKING · 2010 CENSUS · 97 SHOWN OF 97

Oldest housing stock, Iowa counties · 2010

Iowa counties ranked by oldest median year of construction (2010 ACS). This list covers the 97 counties in Iowa that qualify, ranked against each other statewide. The median across all 97 is 1956.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2010 2020 2024

RANKPLACESTATEPOPMEDIAN YEAR BUILTVS 1990

01Adams County, IAIA3,61719400%

02Montgomery County, IAIA10,00219430%

03Fayette County, IAIA19,04719450%

04Franklin County, IAIA9,86819450%

05Audubon County, IAIA5,50919480%

06Ida County, IAIA6,77719480%

07Monona County, IAIA8,53919480%

08Pocahontas County, IAIA6,81919480%

09Sac County, IAIA9,52519480%

10Cass County, IAIA12,96019490%

11Osceola County, IAIA5,98019490%

12Page County, IAIA14,85619490%

13Worth County, IAIA7,33819490%

14Mitchell County, IAIA10,65019500%

15Howard County, IAIA9,41519500%

16Tama County, IAIA16,7961950+1%

17Butler County, IAIA14,04919510%

18O'Brien County, IAIA14,22019510%

19Shelby County, IAIA11,68919510%

20Wapello County, IAIA35,21019510%

21Greene County, IAIA8,6581952+1%

22Boone County, IAIA26,79919520%

23Clayton County, IAIA16,8451952+1%

24Emmet County, IAIA9,10719520%

25Harrison County, IAIA14,6231952+1%

26Palo Alto County, IAIA8,89919520%

27Union County, IAIA11,82919530%

28Des Moines County, IAIA38,07719530%

29Calhoun County, IAIA9,56219530%

30Cherokee County, IAIA11,36919530%

31Fremont County, IAIA6,52219530%

32Hamilton County, IAIA14,94419530%

33Hardin County, IAIA16,45519530%

34Wright County, IAIA12,80119530%

35Decatur County, IAIA7,65519540%

36Buena Vista County, IAIA20,44919540%

37Clinton County, IAIA46,00219540%

38Floyd County, IAIA14,90119540%

39Kossuth County, IAIA14,32219540%

40Lucas County, IAIA8,84719540%

41Cedar County, IAIA18,35919550%

42Grundy County, IAIA12,36119550%

43Humboldt County, IAIA9,40919550%

44Lee County, IAIA32,30619550%

45Webster County, IAIA36,83819550%

46Appanoose County, IAIA12,07719560%

47Cerro Gordo County, IAIA42,37219560%

48Chickasaw County, IAIA11,66319560%

49Marshall County, IAIA39,89019560%

50Winneshiek County, IAIA19,7331956+1%

51Woodbury County, IAIA106,64919560%

52Adair County, IAIA7,4031957+1%

53Crawford County, IAIA16,23719570%

54Hancock County, IAIA10,52819570%

55Lyon County, IAIA12,3541957+1%

56Wayne County, IAIA6,7381957+1%

57Carroll County, IAIA20,30319590%

58Clay County, IAIA16,20219590%

59Black Hawk County, IAIA131,53219600%

60Guthrie County, IAIA10,7821960+1%

61Jackson County, IAIA19,28819600%

62Monroe County, IAIA7,40619600%

63Van Buren County, IAIA7,1311960+1%

64Winnebago County, IAIA10,25119600%

65Bremer County, IAIA25,29619610%

66Iowa County, IAIA16,5041961+1%

67Jones County, IAIA21,25319610%

68Mahaska County, IAIA21,88019610%

69Pottawattamie County, IAIA92,99619620%

70Delaware County, IAIA17,67419620%

71Muscatine County, IAIA41,85319620%

72Washington County, IAIA22,6671962+1%

73Allamakee County, IAIA14,2381963+1%

74Buchanan County, IAIA20,88319630%

75Jasper County, IAIA38,15319630%

76Louisa County, IAIA10,41619630%

77Sioux County, IAIA36,77419630%

78Clarke County, IAIA9,57419640%

79Benton County, IAIA26,0041964+1%

80Dubuque County, IAIA99,38119640%

81Plymouth County, IAIA25,6971964+1%

82Poweshiek County, IAIA18,36819650%

83Madison County, IAIA17,2701965+1%

84Scott County, IAIA175,25919650%

85Jefferson County, IAIA15,2911966+1%

86Davis County, IAIA9,2301967+1%

87Henry County, IAIA19,3491969+1%

88Ringgold County, IAIA4,6421970+1%

89Marion County, IAIA34,19219710%

90Dickinson County, IAIA18,0771972+1%

91Linn County, IAIA232,0281972+1%

92Mills County, IAIA14,7931972+1%

93Polk County, IAIA516,5461973+1%

94Warren County, IAIA57,33119750%

95Story County, IAIA101,2911977+1%

96Johnson County, IAIA160,0441980+1%

97Dallas County, IAIA118,4571993+2%

SHOWING 1–97 OF 97

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