RANKING · 1990 CENSUS · 99 SHOWN OF 99

Oldest housing stock, Iowa counties · 1990

Iowa counties ranked by oldest median year of construction (1990 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 1950.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2010 2020 2024

RANKPLACESTATEPOPMEDIAN YEAR BUILTVS –

01Taylor County, IAIA5,8351939–

02Greene County, IAIA8,6581939–

03Adair County, IAIA7,4031939–

04Adams County, IAIA3,6171939–

05Audubon County, IAIA5,5091939–

06Clayton County, IAIA16,8451939–

07Fayette County, IAIA19,0471939–

08Harrison County, IAIA14,6231939–

09Ida County, IAIA6,7771939–

10Keokuk County, IAIA9,7971939–

11Monona County, IAIA8,5391939–

12Montgomery County, IAIA10,0021939–

13Tama County, IAIA16,7961939–

14Worth County, IAIA7,3381940–

15Van Buren County, IAIA7,1311941–

16Osceola County, IAIA5,9801942–

17Pocahontas County, IAIA6,8191942–

18Boone County, IAIA26,7991943–

19Franklin County, IAIA9,8681943–

20Howard County, IAIA9,4151943–

21Lyon County, IAIA12,3541944–

22Page County, IAIA14,8561944–

23Sac County, IAIA9,5251944–

24Washington County, IAIA22,6671944–

25Wayne County, IAIA6,7381944–

26Winneshiek County, IAIA19,7331944–

27Mitchell County, IAIA10,6501945–

28Cass County, IAIA12,9601945–

29Iowa County, IAIA16,5041945–

30Madison County, IAIA17,2701945–

31Shelby County, IAIA11,6891945–

32O'Brien County, IAIA14,2201946–

33Ringgold County, IAIA4,6421946–

34Benton County, IAIA26,0041947–

35Butler County, IAIA14,0491947–

36Calhoun County, IAIA9,5621947–

37Fremont County, IAIA6,5221947–

38Cedar County, IAIA18,3591948–

39Cherokee County, IAIA11,3691948–

40Chickasaw County, IAIA11,6631948–

41Guthrie County, IAIA10,7821948–

42Lucas County, IAIA8,8471948–

43Wapello County, IAIA35,2101948–

44Woodbury County, IAIA106,6491948–

45Union County, IAIA11,8291949–

46Des Moines County, IAIA38,0771949–

47Kossuth County, IAIA14,3221949–

48Lee County, IAIA32,3061949–

49Wright County, IAIA12,8011949–

50Clinton County, IAIA46,0021950–

51Grundy County, IAIA12,3611950–

52Hamilton County, IAIA14,9441950–

53Palo Alto County, IAIA8,8991950–

54Emmet County, IAIA9,1071951–

55Hardin County, IAIA16,4551951–

56Humboldt County, IAIA9,4091951–

57Webster County, IAIA36,8381951–

58Buena Vista County, IAIA20,4491952–

59Carroll County, IAIA20,3031952–

60Floyd County, IAIA14,9011952–

61Jefferson County, IAIA15,2911952–

62Marshall County, IAIA39,8901952–

63Monroe County, IAIA7,4061952–

64Plymouth County, IAIA25,6971952–

65Decatur County, IAIA7,6551953–

66Allamakee County, IAIA14,2381953–

67Cerro Gordo County, IAIA42,3721953–

68Crawford County, IAIA16,2371953–

69Hancock County, IAIA10,5281953–

70Jones County, IAIA21,2531953–

71Mahaska County, IAIA21,8801953–

72Bremer County, IAIA25,2961954–

73Clay County, IAIA16,2021954–

74Davis County, IAIA9,2301954–

75Jackson County, IAIA19,2881954–

76Sioux County, IAIA36,7741954–

77Pottawattamie County, IAIA92,9961955–

78Winnebago County, IAIA10,2511955–

79Delaware County, IAIA17,6741956–

80Dubuque County, IAIA99,3811956–

81Jasper County, IAIA38,1531956–

82Muscatine County, IAIA41,8531956–

83Black Hawk County, IAIA131,5321957–

84Buchanan County, IAIA20,8831957–

85Henry County, IAIA19,3491957–

86Appanoose County, IAIA12,0771958–

87Clarke County, IAIA9,5741959–

88Dallas County, IAIA118,4571959–

89Mills County, IAIA14,7931959–

90Poweshiek County, IAIA18,3681960–

91Linn County, IAIA232,0281961–

92Louisa County, IAIA10,4161961–

93Scott County, IAIA175,2591961–

94Dickinson County, IAIA18,0771962–

95Marion County, IAIA34,1921962–

96Polk County, IAIA516,5461962–

97Story County, IAIA101,2911964–

98Johnson County, IAIA160,0441968–

99Warren County, IAIA57,3311968–

SHOWING 1–99 OF 99

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