RANKING · 2020 CENSUS · 99 SHOWN OF 99

Youngest by median age, Iowa counties · 2020

Iowa counties with the youngest median age (2020 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 42.6.

Flip the list · Oldest by median age, US counties →

IowaAll states All rankings

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, IAIA101,29126.9+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, IAIA35,21039.10%

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

Download CSV (full list, 99 rows)

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