RANKING · 1990 CENSUS · 99 SHOWN OF 99

Youngest by median age, Iowa counties · 1990

Iowa counties with the youngest median age (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

RELATEDOldest 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

01Story County, IAIA101,29125.9−2%

02Johnson County, IAIA160,04427.3−4%

03Sioux County, IAIA36,77431.1−5%

04Winneshiek County, IAIA19,73331.5−12%

05Scott County, IAIA175,25932.4−8%

06Polk County, IAIA516,54632.5−6%

07Delaware County, IAIA17,67432.5−13%

08Warren County, IAIA57,33132.8−9%

09Black Hawk County, IAIA131,53232.9−4%

10Woodbury County, IAIA106,64933.1−3%

11Dubuque County, IAIA99,38133.1−9%

12Linn County, IAIA232,02833.1−6%

13Muscatine County, IAIA41,85333.1−8%

14Buchanan County, IAIA20,88333.5−8%

15Pottawattamie County, IAIA92,99633.6−8%

16Buena Vista County, IAIA20,44933.9−7%

17Marion County, IAIA34,19234.0−9%

18Plymouth County, IAIA25,69734.1−10%

19Louisa County, IAIA10,41634.2−5%

20Carroll County, IAIA20,30334.2−12%

21Poweshiek County, IAIA18,36834.5−10%

22Henry County, IAIA19,34934.6−7%

23Dallas County, IAIA118,45734.6−1%

24Jones County, IAIA21,25334.6−10%

25Benton County, IAIA26,00434.7−7%

26Mahaska County, IAIA21,88034.8−7%

27Lyon County, IAIA12,35434.8−9%

28Jackson County, IAIA19,28835.0−10%

29Mills County, IAIA14,79335.1−8%

30Clinton County, IAIA46,00235.1−8%

31Clay County, IAIA16,20235.1−11%

32Bremer County, IAIA25,29635.2−8%

33Cerro Gordo County, IAIA42,37235.3−10%

34Crawford County, IAIA16,23735.4−7%

35Decatur County, IAIA7,65535.4−3%

36Hancock County, IAIA10,52835.5−11%

37Webster County, IAIA36,83835.5−6%

38Washington County, IAIA22,66735.6−8%

39Chickasaw County, IAIA11,66335.7−10%

40Winnebago County, IAIA10,25135.9−10%

41Clayton County, IAIA16,84535.9−11%

42Des Moines County, IAIA38,07736.0−8%

43Lee County, IAIA32,30636.0−9%

44Davis County, IAIA9,23036.0−6%

45Emmet County, IAIA9,10736.1−9%

46Jasper County, IAIA38,15336.1−6%

47Cedar County, IAIA18,35936.1−8%

48Madison County, IAIA17,27036.2−5%

49Osceola County, IAIA5,98036.2−9%

50Fayette County, IAIA19,04736.2−8%

51Allamakee County, IAIA14,23836.3−9%

52Iowa County, IAIA16,50436.5−6%

53Kossuth County, IAIA14,32236.6−11%

54Harrison County, IAIA14,62336.6−6%

55Boone County, IAIA26,79936.6−5%

56Union County, IAIA11,82936.7−8%

57Marshall County, IAIA39,89036.8−5%

58Clarke County, IAIA9,57436.9−4%

59Jefferson County, IAIA15,29136.9−10%

60O'Brien County, IAIA14,22036.9−9%

61Ida County, IAIA6,77737.0−11%

62Shelby County, IAIA11,68937.1−8%

63Cherokee County, IAIA11,36937.2−11%

64Hamilton County, IAIA14,94437.2−5%

65Wapello County, IAIA35,21037.2−5%

66Tama County, IAIA16,79637.3−5%

67Palo Alto County, IAIA8,89937.4−8%

68Howard County, IAIA9,41537.4−5%

69Keokuk County, IAIA9,79737.5−6%

70Monroe County, IAIA7,40637.6−5%

71Sac County, IAIA9,52537.7−10%

72Van Buren County, IAIA7,13137.7−8%

73Floyd County, IAIA14,90137.8−6%

74Butler County, IAIA14,04937.9−8%

75Franklin County, IAIA9,86837.9−8%

76Appanoose County, IAIA12,07738.0−6%

77Hardin County, IAIA16,45538.2−6%

78Montgomery County, IAIA10,00238.3−5%

79Fremont County, IAIA6,52238.4−7%

80Worth County, IAIA7,33838.4−6%

81Page County, IAIA14,85638.5−4%

82Cass County, IAIA12,96038.5−7%

83Mitchell County, IAIA10,65038.6−5%

84Lucas County, IAIA8,84738.6−3%

85Humboldt County, IAIA9,40938.7−6%

86Grundy County, IAIA12,36138.9−5%

87Wright County, IAIA12,80138.9−6%

88Pocahontas County, IAIA6,81939.1−8%

89Adair County, IAIA7,40339.3−6%

90Greene County, IAIA8,65839.3−4%

91Dickinson County, IAIA18,07739.4−9%

92Calhoun County, IAIA9,56239.6−7%

93Taylor County, IAIA5,83539.7−4%

94Guthrie County, IAIA10,78240.1−4%

95Audubon County, IAIA5,50940.4−5%

96Adams County, IAIA3,61740.5−3%

97Monona County, IAIA8,53941.3−4%

98Wayne County, IAIA6,73841.8−3%

99Ringgold County, IAIA4,64242.4−2%

SHOWING 1–99 OF 99

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