RANKING · 2010 CENSUS · 99 SHOWN OF 99

Youngest by median age, Iowa counties · 2010

Iowa counties with the youngest median age (2010 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 42.5.

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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 2000

01Story County, IAIA101,29126.7+1%

02Johnson County, IAIA160,04429.3+3%

03Sioux County, IAIA36,77432.70%

04Dallas County, IAIA118,45734.3−2%

05Black Hawk County, IAIA131,53234.40%

06Polk County, IAIA516,54634.7+1%

07Woodbury County, IAIA106,64935.1+3%

08Linn County, IAIA232,02836.5+4%

09Buena Vista County, IAIA20,44937.1+2%

10Scott County, IAIA175,25937.7+6%

11Decatur County, IAIA7,65538.2+5%

12Muscatine County, IAIA41,85338.2+6%

13Warren County, IAIA57,33138.3+6%

14Crawford County, IAIA16,23738.4+1%

15Pottawattamie County, IAIA92,99638.5+5%

16Davis County, IAIA9,23038.60%

17Dubuque County, IAIA99,38138.6+6%

18Marion County, IAIA34,19238.6+4%

19Lyon County, IAIA12,35438.7+2%

20Mahaska County, IAIA21,88038.9+5%

21Buchanan County, IAIA20,88339.0+7%

22Bremer County, IAIA25,29639.3+3%

23Winneshiek County, IAIA19,73339.4+10%

24Marshall County, IAIA39,89039.6+3%

25Louisa County, IAIA10,41639.8+11%

26Madison County, IAIA17,27039.8+5%

27Wapello County, IAIA35,21039.8+2%

28Webster County, IAIA36,83840.0+6%

29Clarke County, IAIA9,57440.2+4%

30Henry County, IAIA19,34940.2+8%

31Boone County, IAIA26,79940.8+6%

32Union County, IAIA11,82940.9+2%

33Benton County, IAIA26,00440.9+10%

34Poweshiek County, IAIA18,36841.0+7%

35Emmet County, IAIA9,10741.0+4%

36Mills County, IAIA14,79341.2+8%

37Plymouth County, IAIA25,69741.2+9%

38Clinton County, IAIA46,00241.4+8%

39Des Moines County, IAIA38,07741.5+7%

40Jasper County, IAIA38,15341.6+8%

41Washington County, IAIA22,66741.6+7%

42Tama County, IAIA16,79641.8+7%

43Delaware County, IAIA17,67442.1+13%

44Howard County, IAIA9,41542.1+7%

45Monroe County, IAIA7,40642.1+6%

46Carroll County, IAIA20,30342.3+9%

47Hamilton County, IAIA14,94442.3+8%

48Cedar County, IAIA18,35942.4+8%

49Iowa County, IAIA16,50442.4+9%

50Clay County, IAIA16,20242.5+8%

51Lee County, IAIA32,30642.6+8%

52Jones County, IAIA21,25342.7+11%

53Franklin County, IAIA9,86842.8+4%

54Harrison County, IAIA14,62342.9+10%

55Grundy County, IAIA12,36143.0+5%

56Fayette County, IAIA19,04743.2+10%

57Cerro Gordo County, IAIA42,37243.3+10%

58Floyd County, IAIA14,90143.3+7%

59Van Buren County, IAIA7,13143.3+6%

60Jefferson County, IAIA15,29143.5+6%

61Osceola County, IAIA5,98043.5+10%

62Winnebago County, IAIA10,25143.5+9%

63O'Brien County, IAIA14,22043.6+7%

64Chickasaw County, IAIA11,66343.7+10%

65Hardin County, IAIA16,45543.7+8%

66Page County, IAIA14,85643.7+9%

67Butler County, IAIA14,04943.8+6%

68Keokuk County, IAIA9,79743.8+9%

69Worth County, IAIA7,33843.8+8%

70Palo Alto County, IAIA8,89943.9+8%

71Mitchell County, IAIA10,65044.0+8%

72Allamakee County, IAIA14,23844.0+11%

73Jackson County, IAIA19,28844.0+13%

74Lucas County, IAIA8,84744.1+11%

75Appanoose County, IAIA12,07744.2+9%

76Humboldt County, IAIA9,40944.3+7%

77Wright County, IAIA12,80144.4+7%

78Taylor County, IAIA5,83544.6+7%

79Montgomery County, IAIA10,00244.6+10%

80Guthrie County, IAIA10,78244.8+7%

81Hancock County, IAIA10,52844.8+13%

82Ida County, IAIA6,77744.8+8%

83Clayton County, IAIA16,84545.0+12%

84Cass County, IAIA12,96045.1+8%

85Fremont County, IAIA6,52245.1+9%

86Adair County, IAIA7,40345.3+8%

87Wayne County, IAIA6,73845.3+5%

88Shelby County, IAIA11,68945.4+12%

89Greene County, IAIA8,65845.6+11%

90Ringgold County, IAIA4,64245.6+6%

91Kossuth County, IAIA14,32246.6+13%

92Sac County, IAIA9,52546.6+11%

93Adams County, IAIA3,61746.7+11%

94Audubon County, IAIA5,50947.0+11%

95Cherokee County, IAIA11,36947.0+13%

96Monona County, IAIA8,53947.5+10%

97Pocahontas County, IAIA6,81947.6+12%

98Calhoun County, IAIA9,56247.8+13%

99Dickinson County, IAIA18,07748.1+11%

SHOWING 1–99 OF 99

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