RANKING · 2000 CENSUS · 99 SHOWN OF 99

Youngest by median age, Iowa counties · 2000

Iowa counties with the youngest median age (2000 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 39.4.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 1990

01Story County, IAIA101,29126.5+2%

02Johnson County, IAIA160,04428.4+4%

03Sioux County, IAIA36,77432.8+6%

04Woodbury County, IAIA106,64934.2+3%

05Black Hawk County, IAIA131,53234.4+5%

06Polk County, IAIA516,54634.4+6%

07Dallas County, IAIA118,45735.1+1%

08Linn County, IAIA232,02835.2+6%

09Scott County, IAIA175,25935.4+9%

10Winneshiek County, IAIA19,73335.7+13%

11Louisa County, IAIA10,41635.9+5%

12Warren County, IAIA57,33136.0+10%

13Muscatine County, IAIA41,85336.1+9%

14Decatur County, IAIA7,65536.4+3%

15Buchanan County, IAIA20,88336.4+9%

16Buena Vista County, IAIA20,44936.4+8%

17Pottawattamie County, IAIA92,99636.5+9%

18Dubuque County, IAIA99,38136.5+10%

19Delaware County, IAIA17,67437.1+14%

20Henry County, IAIA19,34937.1+7%

21Benton County, IAIA26,00437.2+7%

22Mahaska County, IAIA21,88037.2+7%

23Marion County, IAIA34,19237.2+9%

24Webster County, IAIA36,83837.7+6%

25Plymouth County, IAIA25,69737.8+11%

26Madison County, IAIA17,27037.9+5%

27Bremer County, IAIA25,29638.1+8%

28Lyon County, IAIA12,35438.1+9%

29Mills County, IAIA14,79338.1+9%

30Clinton County, IAIA46,00238.2+9%

31Crawford County, IAIA16,23738.2+8%

32Poweshiek County, IAIA18,36838.4+11%

33Davis County, IAIA9,23038.5+7%

34Jasper County, IAIA38,15338.5+7%

35Jones County, IAIA21,25338.5+11%

36Clarke County, IAIA9,57438.6+5%

37Boone County, IAIA26,79938.6+5%

38Marshall County, IAIA39,89038.6+5%

39Carroll County, IAIA20,30338.7+13%

40Iowa County, IAIA16,50438.8+6%

41Washington County, IAIA22,66738.8+9%

42Des Moines County, IAIA38,07738.9+8%

43Harrison County, IAIA14,62338.9+6%

44Hamilton County, IAIA14,94439.1+5%

45Jackson County, IAIA19,28839.1+12%

46Tama County, IAIA16,79639.1+5%

47Cedar County, IAIA18,35939.2+9%

48Wapello County, IAIA35,21039.2+5%

49Cerro Gordo County, IAIA42,37239.3+11%

50Clay County, IAIA16,20239.4+12%

51Fayette County, IAIA19,04739.4+9%

52Howard County, IAIA9,41539.5+6%

53Lee County, IAIA32,30639.5+10%

54Emmet County, IAIA9,10739.6+10%

55Allamakee County, IAIA14,23839.7+9%

56Chickasaw County, IAIA11,66339.7+11%

57Hancock County, IAIA10,52839.7+12%

58Monroe County, IAIA7,40639.7+6%

59Osceola County, IAIA5,98039.7+10%

60Winnebago County, IAIA10,25139.8+11%

61Lucas County, IAIA8,84739.9+3%

62Keokuk County, IAIA9,79740.0+7%

63Union County, IAIA11,82940.1+9%

64Clayton County, IAIA16,84540.2+12%

65Page County, IAIA14,85640.2+5%

66Floyd County, IAIA14,90140.3+7%

67Montgomery County, IAIA10,00240.4+5%

68Shelby County, IAIA11,68940.5+9%

69Mitchell County, IAIA10,65040.6+5%

70Appanoose County, IAIA12,07740.6+7%

71Hardin County, IAIA16,45540.6+6%

72O'Brien County, IAIA14,22040.7+10%

73Palo Alto County, IAIA8,89940.7+9%

74Worth County, IAIA7,33840.7+6%

75Grundy County, IAIA12,36140.8+5%

76Van Buren County, IAIA7,13140.8+8%

77Greene County, IAIA8,65841.0+4%

78Jefferson County, IAIA15,29141.1+11%

79Fremont County, IAIA6,52241.2+7%

80Butler County, IAIA14,04941.3+9%

81Franklin County, IAIA9,86841.3+9%

82Humboldt County, IAIA9,40941.3+7%

83Kossuth County, IAIA14,32241.3+13%

84Wright County, IAIA12,80141.4+6%

85Ida County, IAIA6,77741.5+12%

86Taylor County, IAIA5,83541.6+5%

87Cass County, IAIA12,96041.6+8%

88Cherokee County, IAIA11,36941.7+12%

89Adair County, IAIA7,40341.8+6%

90Adams County, IAIA3,61741.9+4%

91Guthrie County, IAIA10,78241.9+4%

92Sac County, IAIA9,52542.1+12%

93Audubon County, IAIA5,50942.4+5%

94Calhoun County, IAIA9,56242.4+7%

95Pocahontas County, IAIA6,81942.5+9%

96Monona County, IAIA8,53943.0+4%

97Wayne County, IAIA6,73843.0+3%

98Ringgold County, IAIA4,64243.2+2%

99Dickinson County, IAIA18,07743.3+10%

SHOWING 1–99 OF 99

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