RANKING · 2010 CENSUS · 99 SHOWN OF 99

Oldest by median age, Iowa counties · 2010

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, IAIA18,07748.1+11%

02Calhoun County, IAIA9,56247.8+13%

03Pocahontas County, IAIA6,81947.6+12%

04Monona County, IAIA8,53947.5+10%

05Audubon County, IAIA5,50947.0+11%

06Cherokee County, IAIA11,36947.0+13%

07Adams County, IAIA3,61746.7+11%

08Kossuth County, IAIA14,32246.6+13%

09Sac County, IAIA9,52546.6+11%

10Greene County, IAIA8,65845.6+11%

11Ringgold County, IAIA4,64245.6+6%

12Shelby County, IAIA11,68945.4+12%

13Adair County, IAIA7,40345.3+8%

14Wayne County, IAIA6,73845.3+5%

15Cass County, IAIA12,96045.1+8%

16Fremont County, IAIA6,52245.1+9%

17Clayton County, IAIA16,84545.0+12%

18Guthrie County, IAIA10,78244.8+7%

19Hancock County, IAIA10,52844.8+13%

20Ida County, IAIA6,77744.8+8%

21Taylor County, IAIA5,83544.6+7%

22Montgomery County, IAIA10,00244.6+10%

23Wright County, IAIA12,80144.4+7%

24Humboldt County, IAIA9,40944.3+7%

25Appanoose County, IAIA12,07744.2+9%

26Lucas County, IAIA8,84744.1+11%

27Mitchell County, IAIA10,65044.0+8%

28Allamakee County, IAIA14,23844.0+11%

29Jackson County, IAIA19,28844.0+13%

30Palo Alto County, IAIA8,89943.9+8%

31Butler County, IAIA14,04943.8+6%

32Keokuk County, IAIA9,79743.8+9%

33Worth County, IAIA7,33843.8+8%

34Chickasaw County, IAIA11,66343.7+10%

35Hardin County, IAIA16,45543.7+8%

36Page County, IAIA14,85643.7+9%

37O'Brien County, IAIA14,22043.6+7%

38Jefferson County, IAIA15,29143.5+6%

39Osceola County, IAIA5,98043.5+10%

40Winnebago County, IAIA10,25143.5+9%

41Cerro Gordo County, IAIA42,37243.3+10%

42Floyd County, IAIA14,90143.3+7%

43Van Buren County, IAIA7,13143.3+6%

44Fayette County, IAIA19,04743.2+10%

45Grundy County, IAIA12,36143.0+5%

46Harrison County, IAIA14,62342.9+10%

47Franklin County, IAIA9,86842.8+4%

48Jones County, IAIA21,25342.7+11%

49Lee County, IAIA32,30642.6+8%

50Clay County, IAIA16,20242.5+8%

51Cedar County, IAIA18,35942.4+8%

52Iowa County, IAIA16,50442.4+9%

53Carroll County, IAIA20,30342.3+9%

54Hamilton County, IAIA14,94442.3+8%

55Delaware County, IAIA17,67442.1+13%

56Howard County, IAIA9,41542.1+7%

57Monroe County, IAIA7,40642.1+6%

58Tama County, IAIA16,79641.8+7%

59Jasper County, IAIA38,15341.6+8%

60Washington County, IAIA22,66741.6+7%

61Des Moines County, IAIA38,07741.5+7%

62Clinton County, IAIA46,00241.4+8%

63Mills County, IAIA14,79341.2+8%

64Plymouth County, IAIA25,69741.2+9%

65Poweshiek County, IAIA18,36841.0+7%

66Emmet County, IAIA9,10741.0+4%

67Union County, IAIA11,82940.9+2%

68Benton County, IAIA26,00440.9+10%

69Boone County, IAIA26,79940.8+6%

70Clarke County, IAIA9,57440.2+4%

71Henry County, IAIA19,34940.2+8%

72Webster County, IAIA36,83840.0+6%

73Louisa County, IAIA10,41639.8+11%

74Madison County, IAIA17,27039.8+5%

75Wapello County, IAIA35,21039.8+2%

76Marshall County, IAIA39,89039.6+3%

77Winneshiek County, IAIA19,73339.4+10%

78Bremer County, IAIA25,29639.3+3%

79Buchanan County, IAIA20,88339.0+7%

80Mahaska County, IAIA21,88038.9+5%

81Lyon County, IAIA12,35438.7+2%

82Davis County, IAIA9,23038.6+0%

83Dubuque County, IAIA99,38138.6+6%

84Marion County, IAIA34,19238.6+4%

85Pottawattamie County, IAIA92,99638.5+5%

86Crawford County, IAIA16,23738.4+1%

87Warren County, IAIA57,33138.3+6%

88Decatur County, IAIA7,65538.2+5%

89Muscatine County, IAIA41,85338.2+6%

90Scott County, IAIA175,25937.7+6%

91Buena Vista County, IAIA20,44937.1+2%

92Linn County, IAIA232,02836.5+4%

93Woodbury County, IAIA106,64935.1+3%

94Polk County, IAIA516,54634.7+1%

95Black Hawk County, IAIA131,53234.4+0%

96Dallas County, IAIA118,45734.3−2%

97Sioux County, IAIA36,77432.7−0%

98Johnson County, IAIA160,04429.3+3%

99Story County, IAIA101,29126.7+1%

SHOWING 1–99 OF 99

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