RANKING · 2024 ACS · 99 SHOWN OF 99

Oldest by median age, Iowa counties

Iowa counties ranked by median age of residents (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: Page County, IA, up 32 places to #9.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Dickinson County, IAIA18,07748.7+12%

02Audubon County, IAIA5,50947.0+11%

03▲9Fremont County, IAIA6,52246.8+14%

04Guthrie County, IAIA10,78246.7+11%

05▼2Clayton County, IAIA16,84546.4+15%

06▲7Adams County, IAIA3,61746.3+11%

07▲1Sac County, IAIA9,52546.2+10%

08▲28Hardin County, IAIA16,45545.4+12%

09▲32Page County, IAIA14,85645.1+12%

10▲9Jackson County, IAIA19,28844.7+14%

11▲13Van Buren County, IAIA7,13144.7+10%

12▲9Greene County, IAIA8,65844.6+9%

13▲3Hancock County, IAIA10,52844.6+12%

14▼4Ringgold County, IAIA4,64244.5+3%

15▼10Shelby County, IAIA11,68944.3+9%

16▼9Kossuth County, IAIA14,32244.2+7%

17▲25Worth County, IAIA7,33844.1+8%

18▲13Cedar County, IAIA18,35944.0+12%

19▲3Cerro Gordo County, IAIA42,37244.0+12%

20▼11Cherokee County, IAIA11,36944.0+6%

21▲7Fayette County, IAIA19,04743.9+11%

22▲12Taylor County, IAIA5,83543.8+5%

23▼6Butler County, IAIA14,04943.7+6%

24▼18Jefferson County, IAIA15,29143.7+6%

25▼14Monona County, IAIA8,53943.7+2%

26▼8Pocahontas County, IAIA6,81943.7+3%

27▼4Lee County, IAIA32,30643.6+10%

28▼13Appanoose County, IAIA12,07743.5+7%

29▼15Cass County, IAIA12,96043.5+5%

30▲2Floyd County, IAIA14,90143.5+8%

31▼11Montgomery County, IAIA10,00243.5+8%

32▲3Delaware County, IAIA17,67443.4+17%

33▲5Keokuk County, IAIA9,79743.4+8%

34▲9Allamakee County, IAIA14,23843.1+9%

35▲21Benton County, IAIA26,00443.1+16%

36▼7Chickasaw County, IAIA11,66343.1+9%

37▲9Osceola County, IAIA5,98043.1+9%

38▲6Emmet County, IAIA9,10742.9+8%

39▼14Calhoun County, IAIA9,56242.8+1%

40Jones County, IAIA21,25342.8+11%

41▲14Franklin County, IAIA9,86842.7+3%

42▲16Winnebago County, IAIA10,25142.7+7%

43▲10Winneshiek County, IAIA19,73342.6+19%

44▼17Adair County, IAIA7,40342.4+1%

45▲18Boone County, IAIA26,79942.4+10%

46▲4Clinton County, IAIA46,00242.4+11%

47▲4Iowa County, IAIA16,50442.4+9%

48▼1Des Moines County, IAIA38,07742.3+9%

49▼1Clay County, IAIA16,20242.3+7%

50▼13Harrison County, IAIA14,62342.1+8%

51▲13Humboldt County, IAIA9,40942.1+2%

52▼7Mills County, IAIA14,79342.1+10%

53▼27Ida County, IAIA6,77742.0+1%

54▼24Mitchell County, IAIA10,65041.9+3%

55▲2Grundy County, IAIA12,36141.9+3%

56▲4Louisa County, IAIA10,41641.9+17%

57▼18Lucas County, IAIA8,84741.9+5%

58▼25Palo Alto County, IAIA8,89941.9+3%

59▼7Monroe County, IAIA7,40641.8+5%

60▼11Hamilton County, IAIA14,94441.7+7%

61▲1Tama County, IAIA16,79641.5+6%

62▲13Wayne County, IAIA6,73841.5−3%

63▼4Jasper County, IAIA38,15341.3+7%

64▲9Plymouth County, IAIA25,69741.3+9%

65▼11Carroll County, IAIA20,30341.1+6%

66▲5Henry County, IAIA19,34941.1+11%

67▲5Poweshiek County, IAIA18,36841.0+7%

68Washington County, IAIA22,66740.7+5%

69▼3Madison County, IAIA17,27040.6+7%

70Union County, IAIA11,82940.5+1%

71▲7Buchanan County, IAIA20,88340.3+11%

72▲5Pottawattamie County, IAIA92,99640.1+10%

73▼6Marion County, IAIA34,19239.9+7%

74▲2Webster County, IAIA36,83839.7+5%

75▲7Muscatine County, IAIA41,85339.6+10%

76▼15O'Brien County, IAIA14,22039.5−3%

77▲8Scott County, IAIA175,25939.4+11%

78▼9Wright County, IAIA12,80139.4−5%

79▼14Howard County, IAIA9,41539.2−1%

80▲4Wapello County, IAIA35,21039.20%

81▲6Dubuque County, IAIA99,38139.1+7%

82▼2Bremer County, IAIA25,29639.0+2%

83▲5Linn County, IAIA232,02839.0+11%

84▼5Mahaska County, IAIA21,88039.0+5%

85▲1Warren County, IAIA57,33138.8+8%

86▼3Marshall County, IAIA39,89038.50%

87▲3Lyon County, IAIA12,35438.20%

88▼14Clarke County, IAIA9,57437.9−2%

89Crawford County, IAIA16,23737.9−1%

90▲2Davis County, IAIA9,23036.3−6%

91▲2Polk County, IAIA516,54636.2+5%

92▼11Decatur County, IAIA7,65536.1−1%

93▲3Dallas County, IAIA118,45736.1+3%

94Woodbury County, IAIA106,64936.1+6%

95▼4Black Hawk County, IAIA131,53235.7+4%

96▼1Buena Vista County, IAIA20,44935.6−2%

97Sioux County, IAIA36,77433.8+3%

98Johnson County, IAIA160,04431.0+9%

99Story County, IAIA101,29126.9+2%

SHOWING 1–99 OF 99

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