RANKING · 2024 ACS · 99 SHOWN OF 99

Youngest by median age, Iowa counties

Iowa counties with the youngest median age (2023 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

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

IowaAll states All rankings

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, IAIA160,04431.0+9%

03Sioux County, IAIA36,77433.8+3%

04Buena Vista County, IAIA20,44935.6−2%

05Black Hawk County, IAIA131,53235.7+4%

06Decatur County, IAIA7,65536.1−1%

07Dallas County, IAIA118,45736.1+3%

08Woodbury County, IAIA106,64936.1+6%

09Polk County, IAIA516,54636.2+5%

10Davis County, IAIA9,23036.3−6%

11Clarke County, IAIA9,57437.9−2%

12Crawford County, IAIA16,23737.9−1%

13Lyon County, IAIA12,35438.2+0%

14Marshall County, IAIA39,89038.5−0%

15Warren County, IAIA57,33138.8+8%

16Bremer County, IAIA25,29639.0+2%

17Linn County, IAIA232,02839.0+11%

18Mahaska County, IAIA21,88039.0+5%

19Dubuque County, IAIA99,38139.1+7%

20Howard County, IAIA9,41539.2−1%

21Wapello County, IAIA35,21039.2+0%

22Scott County, IAIA175,25939.4+11%

23Wright County, IAIA12,80139.4−5%

24O'Brien County, IAIA14,22039.5−3%

25Muscatine County, IAIA41,85339.6+10%

26Webster County, IAIA36,83839.7+5%

27Marion County, IAIA34,19239.9+7%

28Pottawattamie County, IAIA92,99640.1+10%

29Buchanan County, IAIA20,88340.3+11%

30Union County, IAIA11,82940.5+1%

31Madison County, IAIA17,27040.6+7%

32Washington County, IAIA22,66740.7+5%

33Poweshiek County, IAIA18,36841.0+7%

34Carroll County, IAIA20,30341.1+6%

35Henry County, IAIA19,34941.1+11%

36Jasper County, IAIA38,15341.3+7%

37Plymouth County, IAIA25,69741.3+9%

38Tama County, IAIA16,79641.5+6%

39Wayne County, IAIA6,73841.5−3%

40Hamilton County, IAIA14,94441.7+7%

41Monroe County, IAIA7,40641.8+5%

42Mitchell County, IAIA10,65041.9+3%

43Grundy County, IAIA12,36141.9+3%

44Louisa County, IAIA10,41641.9+17%

45Lucas County, IAIA8,84741.9+5%

46Palo Alto County, IAIA8,89941.9+3%

47Ida County, IAIA6,77742.0+1%

48Harrison County, IAIA14,62342.1+8%

49Humboldt County, IAIA9,40942.1+2%

50Mills County, IAIA14,79342.1+10%

51Des Moines County, IAIA38,07742.3+9%

52Clay County, IAIA16,20242.3+7%

53Adair County, IAIA7,40342.4+1%

54Boone County, IAIA26,79942.4+10%

55Clinton County, IAIA46,00242.4+11%

56Iowa County, IAIA16,50442.4+9%

57Winneshiek County, IAIA19,73342.6+19%

58Franklin County, IAIA9,86842.7+3%

59Winnebago County, IAIA10,25142.7+7%

60Calhoun County, IAIA9,56242.8+1%

61Jones County, IAIA21,25342.8+11%

62Emmet County, IAIA9,10742.9+8%

63Allamakee County, IAIA14,23843.1+9%

64Benton County, IAIA26,00443.1+16%

65Chickasaw County, IAIA11,66343.1+9%

66Osceola County, IAIA5,98043.1+9%

67Delaware County, IAIA17,67443.4+17%

68Keokuk County, IAIA9,79743.4+8%

69Appanoose County, IAIA12,07743.5+7%

70Cass County, IAIA12,96043.5+5%

71Floyd County, IAIA14,90143.5+8%

72Montgomery County, IAIA10,00243.5+8%

73Lee County, IAIA32,30643.6+10%

74Butler County, IAIA14,04943.7+6%

75Jefferson County, IAIA15,29143.7+6%

76Monona County, IAIA8,53943.7+2%

77Pocahontas County, IAIA6,81943.7+3%

78Taylor County, IAIA5,83543.8+5%

79Fayette County, IAIA19,04743.9+11%

80Cedar County, IAIA18,35944.0+12%

81Cerro Gordo County, IAIA42,37244.0+12%

82Cherokee County, IAIA11,36944.0+6%

83Worth County, IAIA7,33844.1+8%

84Kossuth County, IAIA14,32244.2+7%

85Shelby County, IAIA11,68944.3+9%

86Ringgold County, IAIA4,64244.5+3%

87Greene County, IAIA8,65844.6+9%

88Hancock County, IAIA10,52844.6+12%

89Jackson County, IAIA19,28844.7+14%

90Van Buren County, IAIA7,13144.7+10%

91Page County, IAIA14,85645.1+12%

92Hardin County, IAIA16,45545.4+12%

93Sac County, IAIA9,52546.2+10%

94Adams County, IAIA3,61746.3+11%

95Clayton County, IAIA16,84546.4+15%

96Guthrie County, IAIA10,78246.7+11%

97Fremont County, IAIA6,52246.8+14%

98Audubon County, IAIA5,50947.0+11%

99Dickinson County, IAIA18,07748.7+12%

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

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