RANKING · 1990 CENSUS · 99 SHOWN OF 99

Oldest by median age, Iowa counties · 1990

Iowa counties ranked by median age of residents (2023 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDYoungest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Ringgold County, IAIA4,64242.4−2%

02Wayne County, IAIA6,73841.8−3%

03Monona County, IAIA8,53941.3−4%

04Adams County, IAIA3,61740.5−3%

05Audubon County, IAIA5,50940.4−5%

06Guthrie County, IAIA10,78240.1−4%

07Taylor County, IAIA5,83539.7−4%

08Calhoun County, IAIA9,56239.6−7%

09Dickinson County, IAIA18,07739.4−9%

10Greene County, IAIA8,65839.3−4%

11Adair County, IAIA7,40339.3−6%

12Pocahontas County, IAIA6,81939.1−8%

13Wright County, IAIA12,80138.9−6%

14Grundy County, IAIA12,36138.9−5%

15Humboldt County, IAIA9,40938.7−6%

16Lucas County, IAIA8,84738.6−3%

17Mitchell County, IAIA10,65038.6−5%

18Cass County, IAIA12,96038.5−7%

19Page County, IAIA14,85638.5−4%

20Worth County, IAIA7,33838.4−6%

21Fremont County, IAIA6,52238.4−7%

22Montgomery County, IAIA10,00238.3−5%

23Hardin County, IAIA16,45538.2−6%

24Appanoose County, IAIA12,07738.0−6%

25Franklin County, IAIA9,86837.9−8%

26Butler County, IAIA14,04937.9−8%

27Floyd County, IAIA14,90137.8−6%

28Van Buren County, IAIA7,13137.7−8%

29Sac County, IAIA9,52537.7−10%

30Monroe County, IAIA7,40637.6−5%

31Keokuk County, IAIA9,79737.5−6%

32Howard County, IAIA9,41537.4−5%

33Palo Alto County, IAIA8,89937.4−8%

34Tama County, IAIA16,79637.3−5%

35Wapello County, IAIA35,21037.2−5%

36Hamilton County, IAIA14,94437.2−5%

37Cherokee County, IAIA11,36937.2−11%

38Shelby County, IAIA11,68937.1−8%

39Ida County, IAIA6,77737.0−11%

40O'Brien County, IAIA14,22036.9−9%

41Jefferson County, IAIA15,29136.9−10%

42Clarke County, IAIA9,57436.9−4%

43Marshall County, IAIA39,89036.8−5%

44Union County, IAIA11,82936.7−8%

45Boone County, IAIA26,79936.6−5%

46Harrison County, IAIA14,62336.6−6%

47Kossuth County, IAIA14,32236.6−11%

48Iowa County, IAIA16,50436.5−6%

49Allamakee County, IAIA14,23836.3−9%

50Fayette County, IAIA19,04736.2−8%

51Osceola County, IAIA5,98036.2−9%

52Madison County, IAIA17,27036.2−5%

53Cedar County, IAIA18,35936.1−8%

54Jasper County, IAIA38,15336.1−6%

55Emmet County, IAIA9,10736.1−9%

56Davis County, IAIA9,23036.0−6%

57Lee County, IAIA32,30636.0−9%

58Des Moines County, IAIA38,07736.0−8%

59Clayton County, IAIA16,84535.9−11%

60Winnebago County, IAIA10,25135.9−10%

61Chickasaw County, IAIA11,66335.7−10%

62Washington County, IAIA22,66735.6−8%

63Webster County, IAIA36,83835.5−6%

64Hancock County, IAIA10,52835.5−11%

65Decatur County, IAIA7,65535.4−3%

66Crawford County, IAIA16,23735.4−7%

67Cerro Gordo County, IAIA42,37235.3−10%

68Bremer County, IAIA25,29635.2−8%

69Clay County, IAIA16,20235.1−11%

70Clinton County, IAIA46,00235.1−8%

71Mills County, IAIA14,79335.1−8%

72Jackson County, IAIA19,28835.0−10%

73Lyon County, IAIA12,35434.8−9%

74Mahaska County, IAIA21,88034.8−7%

75Benton County, IAIA26,00434.7−7%

76Jones County, IAIA21,25334.6−10%

77Dallas County, IAIA118,45734.6−1%

78Henry County, IAIA19,34934.6−7%

79Poweshiek County, IAIA18,36834.5−10%

80Carroll County, IAIA20,30334.2−12%

81Louisa County, IAIA10,41634.2−5%

82Plymouth County, IAIA25,69734.1−10%

83Marion County, IAIA34,19234.0−9%

84Buena Vista County, IAIA20,44933.9−7%

85Pottawattamie County, IAIA92,99633.6−8%

86Buchanan County, IAIA20,88333.5−8%

87Muscatine County, IAIA41,85333.1−8%

88Linn County, IAIA232,02833.1−6%

89Dubuque County, IAIA99,38133.1−9%

90Woodbury County, IAIA106,64933.1−3%

91Black Hawk County, IAIA131,53232.9−4%

92Warren County, IAIA57,33132.8−9%

93Delaware County, IAIA17,67432.5−13%

94Polk County, IAIA516,54632.5−6%

95Scott County, IAIA175,25932.4−8%

96Winneshiek County, IAIA19,73331.5−12%

97Sioux County, IAIA36,77431.1−5%

98Johnson County, IAIA160,04427.3−4%

99Story County, IAIA101,29125.9−2%

SHOWING 1–99 OF 99

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