RANKING · 2024 ACS · 99 SHOWN OF 99

Youngest by median age, Iowa counties

Iowa counties with the youngest median age (2024 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 42.1. Biggest climber in the top 100 since 2020: Ida County, IA, up 27 places to #47.

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SAME RANKING BYCities States Metros ZIP codes

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%

04▲1Buena Vista County, IAIA20,44935.6−2%

05▲4Black Hawk County, IAIA131,53235.7+4%

06▲12Decatur County, IAIA7,65536.1−1%

07▼3Dallas County, IAIA118,45736.1+3%

08▼2Woodbury County, IAIA106,64936.1+6%

09▼1Polk County, IAIA516,54636.2+5%

10▼3Davis County, IAIA9,23036.3−6%

11▲14Clarke County, IAIA9,57437.9−2%

12▼1Crawford County, IAIA16,23737.9−1%

13▼3Lyon County, IAIA12,35438.20%

14▲3Marshall County, IAIA39,89038.50%

15▼1Warren County, IAIA57,33138.8+8%

16▲4Bremer County, IAIA25,29639.0+2%

17▼5Linn County, IAIA232,02839.0+11%

18▲3Mahaska County, IAIA21,88039.0+5%

19▼6Dubuque County, IAIA99,38139.1+7%

20▲15Howard County, IAIA9,41539.2−1%

21▼5Wapello County, IAIA35,21039.20%

22▼7Scott County, IAIA175,25939.4+11%

23▲8Wright County, IAIA12,80139.4−5%

24▲14O'Brien County, IAIA14,22039.5−3%

25▼6Muscatine County, IAIA41,85339.6+10%

26▼2Webster County, IAIA36,83839.7+5%

27▲5Marion County, IAIA34,19239.9+7%

28▼5Pottawattamie County, IAIA92,99640.1+10%

29▼7Buchanan County, IAIA20,88340.3+11%

30Union County, IAIA11,82940.5+1%

31▲3Madison County, IAIA17,27040.6+7%

32▲1Washington County, IAIA22,66740.7+5%

33▼5Poweshiek County, IAIA18,36841.0+7%

34▲11Carroll County, IAIA20,30341.1+6%

35▼6Henry County, IAIA19,34941.1+11%

36▲4Jasper County, IAIA38,15341.3+7%

37▼10Plymouth County, IAIA25,69741.3+9%

38▲1Tama County, IAIA16,79641.5+6%

39▼13Wayne County, IAIA6,73841.5−3%

40▲12Hamilton County, IAIA14,94441.7+7%

41▲8Monroe County, IAIA7,40641.8+5%

42▲25Mitchell County, IAIA10,65041.9+3%

43Grundy County, IAIA12,36141.9+3%

44▼3Louisa County, IAIA10,41641.9+17%

45▲16Lucas County, IAIA8,84741.9+5%

46▲24Palo Alto County, IAIA8,89941.9+3%

47▲27Ida County, IAIA6,77742.0+1%

48▲17Harrison County, IAIA14,62342.1+8%

49▼12Humboldt County, IAIA9,40942.1+2%

50▲5Mills County, IAIA14,79342.1+10%

51▲2Des Moines County, IAIA38,07742.3+9%

52▼1Clay County, IAIA16,20242.3+7%

53▲19Adair County, IAIA7,40342.4+1%

54▼18Boone County, IAIA26,79942.4+10%

55▼8Clinton County, IAIA46,00242.4+11%

56▼8Iowa County, IAIA16,50442.4+9%

57▼7Winneshiek County, IAIA19,73342.6+19%

58▼12Franklin County, IAIA9,86842.7+3%

59▼15Winnebago County, IAIA10,25142.7+7%

60▲15Calhoun County, IAIA9,56242.8+1%

61▼3Jones County, IAIA21,25342.8+11%

62▼8Emmet County, IAIA9,10742.9+8%

63▼6Allamakee County, IAIA14,23843.1+9%

64▼22Benton County, IAIA26,00443.1+16%

65▲6Chickasaw County, IAIA11,66343.1+9%

66▼10Osceola County, IAIA5,98043.1+9%

67▼4Delaware County, IAIA17,67443.4+17%

68▼2Keokuk County, IAIA9,79743.4+8%

69▲15Appanoose County, IAIA12,07743.5+7%

70▲16Cass County, IAIA12,96043.5+5%

71▼2Floyd County, IAIA14,90143.5+8%

72▲8Montgomery County, IAIA10,00243.5+8%

73▲3Lee County, IAIA32,30643.6+10%

74▲8Butler County, IAIA14,04943.7+6%

75▲17Jefferson County, IAIA15,29143.7+6%

76▲13Monona County, IAIA8,53943.7+2%

77▲6Pocahontas County, IAIA6,81943.7+3%

78▼16Taylor County, IAIA5,83543.8+5%

79▼6Fayette County, IAIA19,04743.9+11%

80▼12Cedar County, IAIA18,35944.0+12%

81▼3Cerro Gordo County, IAIA42,37244.0+12%

82▲8Cherokee County, IAIA11,36944.0+6%

83▼23Worth County, IAIA7,33844.1+8%

84▲9Kossuth County, IAIA14,32244.2+7%

85▲10Shelby County, IAIA11,68944.3+9%

86▲5Ringgold County, IAIA4,64244.5+3%

87▼8Greene County, IAIA8,65844.6+9%

88▼3Hancock County, IAIA10,52844.6+12%

89▼8Jackson County, IAIA19,28844.7+14%

90▼13Van Buren County, IAIA7,13144.7+10%

91▼32Page County, IAIA14,85645.1+12%

92▼28Hardin County, IAIA16,45545.4+12%

93▲1Sac County, IAIA9,52546.2+10%

94▼7Adams County, IAIA3,61746.3+11%

95▲2Clayton County, IAIA16,84546.4+15%

96Guthrie County, IAIA10,78246.7+11%

97▼9Fremont County, IAIA6,52246.8+14%

98Audubon County, IAIA5,50947.0+11%

99Dickinson County, IAIA18,07748.7+12%

SHOWING 1–99 OF 99

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES