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.

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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

01Dickinson County, IAIA18,07748.7+12%

02Audubon County, IAIA5,50947.0+11%

03Fremont County, IAIA6,52246.8+14%

04Guthrie County, IAIA10,78246.7+11%

05Clayton County, IAIA16,84546.4+15%

06Adams County, IAIA3,61746.3+11%

07Sac County, IAIA9,52546.2+10%

08Hardin County, IAIA16,45545.4+12%

09Page County, IAIA14,85645.1+12%

10Jackson County, IAIA19,28844.7+14%

11Van Buren County, IAIA7,13144.7+10%

12Greene County, IAIA8,65844.6+9%

13Hancock County, IAIA10,52844.6+12%

14Ringgold County, IAIA4,64244.5+3%

15Shelby County, IAIA11,68944.3+9%

16Kossuth County, IAIA14,32244.2+7%

17Worth County, IAIA7,33844.1+8%

18Cedar County, IAIA18,35944.0+12%

19Cerro Gordo County, IAIA42,37244.0+12%

20Cherokee County, IAIA11,36944.0+6%

21Fayette County, IAIA19,04743.9+11%

22Taylor County, IAIA5,83543.8+5%

23Butler County, IAIA14,04943.7+6%

24Jefferson County, IAIA15,29143.7+6%

25Monona County, IAIA8,53943.7+2%

26Pocahontas County, IAIA6,81943.7+3%

27Lee County, IAIA32,30643.6+10%

28Appanoose County, IAIA12,07743.5+7%

29Cass County, IAIA12,96043.5+5%

30Floyd County, IAIA14,90143.5+8%

31Montgomery County, IAIA10,00243.5+8%

32Delaware County, IAIA17,67443.4+17%

33Keokuk County, IAIA9,79743.4+8%

34Allamakee County, IAIA14,23843.1+9%

35Benton County, IAIA26,00443.1+16%

36Chickasaw County, IAIA11,66343.1+9%

37Osceola County, IAIA5,98043.1+9%

38Emmet County, IAIA9,10742.9+8%

39Calhoun County, IAIA9,56242.8+1%

40Jones County, IAIA21,25342.8+11%

41Franklin County, IAIA9,86842.7+3%

42Winnebago County, IAIA10,25142.7+7%

43Winneshiek County, IAIA19,73342.6+19%

44Adair County, IAIA7,40342.4+1%

45Boone County, IAIA26,79942.4+10%

46Clinton County, IAIA46,00242.4+11%

47Iowa County, IAIA16,50442.4+9%

48Des Moines County, IAIA38,07742.3+9%

49Clay County, IAIA16,20242.3+7%

50Harrison County, IAIA14,62342.1+8%

51Humboldt County, IAIA9,40942.1+2%

52Mills County, IAIA14,79342.1+10%

53Ida County, IAIA6,77742.0+1%

54Mitchell County, IAIA10,65041.9+3%

55Grundy County, IAIA12,36141.9+3%

56Louisa County, IAIA10,41641.9+17%

57Lucas County, IAIA8,84741.9+5%

58Palo Alto County, IAIA8,89941.9+3%

59Monroe County, IAIA7,40641.8+5%

60Hamilton County, IAIA14,94441.7+7%

61Tama County, IAIA16,79641.5+6%

62Wayne County, IAIA6,73841.5−3%

63Jasper County, IAIA38,15341.3+7%

64Plymouth County, IAIA25,69741.3+9%

65Carroll County, IAIA20,30341.1+6%

66Henry County, IAIA19,34941.1+11%

67Poweshiek County, IAIA18,36841.0+7%

68Washington County, IAIA22,66740.7+5%

69Madison County, IAIA17,27040.6+7%

70Union County, IAIA11,82940.5+1%

71Buchanan County, IAIA20,88340.3+11%

72Pottawattamie County, IAIA92,99640.1+10%

73Marion County, IAIA34,19239.9+7%

74Webster County, IAIA36,83839.7+5%

75Muscatine County, IAIA41,85339.6+10%

76O'Brien County, IAIA14,22039.5−3%

77Scott County, IAIA175,25939.4+11%

78Wright County, IAIA12,80139.4−5%

79Howard County, IAIA9,41539.2−1%

80Wapello County, IAIA35,21039.2+0%

81Dubuque County, IAIA99,38139.1+7%

82Bremer County, IAIA25,29639.0+2%

83Linn County, IAIA232,02839.0+11%

84Mahaska County, IAIA21,88039.0+5%

85Warren County, IAIA57,33138.8+8%

86Marshall County, IAIA39,89038.5−0%

87Lyon County, IAIA12,35438.2+0%

88Clarke County, IAIA9,57437.9−2%

89Crawford County, IAIA16,23737.9−1%

90Davis County, IAIA9,23036.3−6%

91Polk County, IAIA516,54636.2+5%

92Decatur County, IAIA7,65536.1−1%

93Dallas County, IAIA118,45736.1+3%

94Woodbury County, IAIA106,64936.1+6%

95Black Hawk County, IAIA131,53235.7+4%

96Buena 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 2026-07-15 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES