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.

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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 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS