RANKING · 2010 CENSUS · 99 SHOWN OF 99

Youngest by median age, Iowa counties · 2010

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, IAIA101,29126.7+1%

02Johnson County, IAIA160,04429.3+3%

03Sioux County, IAIA36,77432.7−0%

04Dallas County, IAIA118,45734.3−2%

05Black Hawk County, IAIA131,53234.4+0%

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, IAIA9,23038.6+0%

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