RANKING · 2020 CENSUS · 99 SHOWN OF 99

Oldest by median age, Iowa counties · 2020

Iowa counties ranked by median age of residents (2023 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

RELATEDYoungest 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

01Dickinson County, IAIA18,07749.1+13%

02Audubon County, IAIA5,50947.3+12%

03Clayton County, IAIA16,84546.7+16%

04Guthrie County, IAIA10,78246.5+11%

05Shelby County, IAIA11,68946.4+15%

06Jefferson County, IAIA15,29146.3+13%

07Kossuth County, IAIA14,32246.3+12%

08Sac County, IAIA9,52546.3+10%

09Cherokee County, IAIA11,36946.0+10%

10Ringgold County, IAIA4,64246.0+6%

11Monona County, IAIA8,53945.9+7%

12Fremont County, IAIA6,52245.7+11%

13Adams County, IAIA3,61745.6+9%

14Cass County, IAIA12,96045.5+9%

15Appanoose County, IAIA12,07745.4+12%

16Hancock County, IAIA10,52845.4+14%

17Butler County, IAIA14,04945.3+10%

18Pocahontas County, IAIA6,81945.3+7%

19Jackson County, IAIA19,28845.2+16%

20Montgomery County, IAIA10,00245.1+12%

21Greene County, IAIA8,65844.9+10%

22Cerro Gordo County, IAIA42,37244.7+14%

23Lee County, IAIA32,30644.4+12%

24Van Buren County, IAIA7,13144.4+9%

25Calhoun County, IAIA9,56244.3+4%

26Ida County, IAIA6,77744.1+6%

27Adair County, IAIA7,40344.0+5%

28Fayette County, IAIA19,04744.0+12%

29Chickasaw County, IAIA11,66343.8+10%

30Mitchell County, IAIA10,65043.6+7%

31Cedar County, IAIA18,35943.6+11%

32Floyd County, IAIA14,90143.6+8%

33Palo Alto County, IAIA8,89943.6+7%

34Taylor County, IAIA5,83543.5+5%

35Delaware County, IAIA17,67443.5+17%

36Hardin County, IAIA16,45543.5+7%

37Harrison County, IAIA14,62343.5+12%

38Keokuk County, IAIA9,79743.5+9%

39Lucas County, IAIA8,84743.4+9%

40Jones County, IAIA21,25343.3+12%

41Page County, IAIA14,85643.3+8%

42Worth County, IAIA7,33843.3+6%

43Allamakee County, IAIA14,23843.2+9%

44Emmet County, IAIA9,10743.1+9%

45Mills County, IAIA14,79343.1+13%

46Osceola County, IAIA5,98043.1+9%

47Des Moines County, IAIA38,07742.9+10%

48Clay County, IAIA16,20242.8+9%

49Hamilton County, IAIA14,94442.8+9%

50Clinton County, IAIA46,00242.6+12%

51Iowa County, IAIA16,50442.6+10%

52Monroe County, IAIA7,40642.6+7%

53Winneshiek County, IAIA19,73342.6+19%

54Carroll County, IAIA20,30342.5+10%

55Franklin County, IAIA9,86842.5+3%

56Benton County, IAIA26,00442.3+14%

57Grundy County, IAIA12,36142.3+4%

58Winnebago County, IAIA10,25142.3+6%

59Jasper County, IAIA38,15342.1+9%

60Louisa County, IAIA10,41642.1+17%

61O'Brien County, IAIA14,22042.0+3%

62Tama County, IAIA16,79642.0+7%

63Boone County, IAIA26,79941.8+8%

64Humboldt County, IAIA9,40941.8+1%

65Howard County, IAIA9,41541.7+6%

66Madison County, IAIA17,27041.2+9%

67Marion County, IAIA34,19241.1+10%

68Washington County, IAIA22,66741.1+6%

69Wright County, IAIA12,80141.0−1%

70Union County, IAIA11,82940.9+2%

71Henry County, IAIA19,34940.8+10%

72Poweshiek County, IAIA18,36840.7+6%

73Plymouth County, IAIA25,69740.6+7%

74Clarke County, IAIA9,57440.3+4%

75Wayne County, IAIA6,73840.3−6%

76Webster County, IAIA36,83840.2+7%

77Pottawattamie County, IAIA92,99640.1+10%

78Buchanan County, IAIA20,88339.8+9%

79Mahaska County, IAIA21,88039.7+7%

80Bremer County, IAIA25,29639.6+4%

81Decatur County, IAIA7,65539.5+9%

82Muscatine County, IAIA41,85339.5+9%

83Marshall County, IAIA39,89039.2+2%

84Wapello County, IAIA35,21039.1−0%

85Scott County, IAIA175,25939.0+10%

86Warren County, IAIA57,33138.8+8%

87Dubuque County, IAIA99,38138.7+6%

88Linn County, IAIA232,02838.0+8%

89Crawford County, IAIA16,23737.8−1%

90Lyon County, IAIA12,35437.7−1%

91Black Hawk County, IAIA131,53236.8+7%

92Davis County, IAIA9,23036.0−6%

93Polk County, IAIA516,54636.0+5%

94Woodbury County, IAIA106,64935.8+5%

95Buena Vista County, IAIA20,44935.7−2%

96Dallas County, IAIA118,45735.4+1%

97Sioux County, IAIA36,77433.4+2%

98Johnson County, IAIA160,04431.2+10%

99Story County, IAIA101,29126.9+2%

SHOWING 1–99 OF 99

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