RANKING · 2020 CENSUS · 99 SHOWN OF 99

Youngest by median age, Iowa counties · 2020

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, IAIA101,29126.9+2%

02Johnson County, IAIA160,04431.2+10%

03Sioux County, IAIA36,77433.4+2%

04Dallas County, IAIA118,45735.4+1%

05Buena Vista County, IAIA20,44935.7−2%

06Woodbury County, IAIA106,64935.8+5%

07Davis County, IAIA9,23036.0−6%

08Polk County, IAIA516,54636.0+5%

09Black Hawk County, IAIA131,53236.8+7%

10Lyon County, IAIA12,35437.7−1%

11Crawford County, IAIA16,23737.8−1%

12Linn County, IAIA232,02838.0+8%

13Dubuque County, IAIA99,38138.7+6%

14Warren County, IAIA57,33138.8+8%

15Scott County, IAIA175,25939.0+10%

16Wapello County, IAIA35,21039.1−0%

17Marshall County, IAIA39,89039.2+2%

18Decatur County, IAIA7,65539.5+9%

19Muscatine County, IAIA41,85339.5+9%

20Bremer County, IAIA25,29639.6+4%

21Mahaska County, IAIA21,88039.7+7%

22Buchanan County, IAIA20,88339.8+9%

23Pottawattamie County, IAIA92,99640.1+10%

24Webster County, IAIA36,83840.2+7%

25Clarke County, IAIA9,57440.3+4%

26Wayne County, IAIA6,73840.3−6%

27Plymouth County, IAIA25,69740.6+7%

28Poweshiek County, IAIA18,36840.7+6%

29Henry County, IAIA19,34940.8+10%

30Union County, IAIA11,82940.9+2%

31Wright County, IAIA12,80141.0−1%

32Marion County, IAIA34,19241.1+10%

33Washington County, IAIA22,66741.1+6%

34Madison County, IAIA17,27041.2+9%

35Howard County, IAIA9,41541.7+6%

36Boone County, IAIA26,79941.8+8%

37Humboldt County, IAIA9,40941.8+1%

38O'Brien County, IAIA14,22042.0+3%

39Tama County, IAIA16,79642.0+7%

40Jasper County, IAIA38,15342.1+9%

41Louisa County, IAIA10,41642.1+17%

42Benton County, IAIA26,00442.3+14%

43Grundy County, IAIA12,36142.3+4%

44Winnebago County, IAIA10,25142.3+6%

45Carroll County, IAIA20,30342.5+10%

46Franklin County, IAIA9,86842.5+3%

47Clinton County, IAIA46,00242.6+12%

48Iowa County, IAIA16,50442.6+10%

49Monroe County, IAIA7,40642.6+7%

50Winneshiek County, IAIA19,73342.6+19%

51Clay County, IAIA16,20242.8+9%

52Hamilton County, IAIA14,94442.8+9%

53Des Moines County, IAIA38,07742.9+10%

54Emmet County, IAIA9,10743.1+9%

55Mills County, IAIA14,79343.1+13%

56Osceola County, IAIA5,98043.1+9%

57Allamakee County, IAIA14,23843.2+9%

58Jones County, IAIA21,25343.3+12%

59Page County, IAIA14,85643.3+8%

60Worth County, IAIA7,33843.3+6%

61Lucas County, IAIA8,84743.4+9%

62Taylor County, IAIA5,83543.5+5%

63Delaware County, IAIA17,67443.5+17%

64Hardin County, IAIA16,45543.5+7%

65Harrison County, IAIA14,62343.5+12%

66Keokuk County, IAIA9,79743.5+9%

67Mitchell County, IAIA10,65043.6+7%

68Cedar County, IAIA18,35943.6+11%

69Floyd County, IAIA14,90143.6+8%

70Palo Alto County, IAIA8,89943.6+7%

71Chickasaw County, IAIA11,66343.8+10%

72Adair County, IAIA7,40344.0+5%

73Fayette County, IAIA19,04744.0+12%

74Ida County, IAIA6,77744.1+6%

75Calhoun County, IAIA9,56244.3+4%

76Lee County, IAIA32,30644.4+12%

77Van Buren County, IAIA7,13144.4+9%

78Cerro Gordo County, IAIA42,37244.7+14%

79Greene County, IAIA8,65844.9+10%

80Montgomery County, IAIA10,00245.1+12%

81Jackson County, IAIA19,28845.2+16%

82Butler County, IAIA14,04945.3+10%

83Pocahontas County, IAIA6,81945.3+7%

84Appanoose County, IAIA12,07745.4+12%

85Hancock County, IAIA10,52845.4+14%

86Cass County, IAIA12,96045.5+9%

87Adams County, IAIA3,61745.6+9%

88Fremont County, IAIA6,52245.7+11%

89Monona County, IAIA8,53945.9+7%

90Cherokee County, IAIA11,36946.0+10%

91Ringgold County, IAIA4,64246.0+6%

92Jefferson County, IAIA15,29146.3+13%

93Kossuth County, IAIA14,32246.3+12%

94Sac County, IAIA9,52546.3+10%

95Shelby County, IAIA11,68946.4+15%

96Guthrie County, IAIA10,78246.5+11%

97Clayton County, IAIA16,84546.7+16%

98Audubon County, IAIA5,50947.3+12%

99Dickinson County, IAIA18,07749.1+13%

SHOWING 1–99 OF 99

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