RANKING · 2000 CENSUS · 99 SHOWN OF 99

Oldest by median age, Iowa counties · 2000

Iowa counties ranked by median age of residents (2000 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 39.4.

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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 1990

01Dickinson County, IAIA18,07743.3+10%

02Ringgold County, IAIA4,64243.2+2%

03Monona County, IAIA8,53943.0+4%

04Wayne County, IAIA6,73843.0+3%

05Pocahontas County, IAIA6,81942.5+9%

06Audubon County, IAIA5,50942.4+5%

07Calhoun County, IAIA9,56242.4+7%

08Sac County, IAIA9,52542.1+12%

09Adams County, IAIA3,61741.9+4%

10Guthrie County, IAIA10,78241.9+4%

11Adair County, IAIA7,40341.8+6%

12Cherokee County, IAIA11,36941.7+12%

13Taylor County, IAIA5,83541.6+5%

14Cass County, IAIA12,96041.6+8%

15Ida County, IAIA6,77741.5+12%

16Wright County, IAIA12,80141.4+6%

17Butler County, IAIA14,04941.3+9%

18Franklin County, IAIA9,86841.3+9%

19Humboldt County, IAIA9,40941.3+7%

20Kossuth County, IAIA14,32241.3+13%

21Fremont County, IAIA6,52241.2+7%

22Jefferson County, IAIA15,29141.1+11%

23Greene County, IAIA8,65841.0+4%

24Grundy County, IAIA12,36140.8+5%

25Van Buren County, IAIA7,13140.8+8%

26O'Brien County, IAIA14,22040.7+10%

27Palo Alto County, IAIA8,89940.7+9%

28Worth County, IAIA7,33840.7+6%

29Mitchell County, IAIA10,65040.6+5%

30Appanoose County, IAIA12,07740.6+7%

31Hardin County, IAIA16,45540.6+6%

32Shelby County, IAIA11,68940.5+9%

33Montgomery County, IAIA10,00240.4+5%

34Floyd County, IAIA14,90140.3+7%

35Clayton County, IAIA16,84540.2+12%

36Page County, IAIA14,85640.2+5%

37Union County, IAIA11,82940.1+9%

38Keokuk County, IAIA9,79740.0+7%

39Lucas County, IAIA8,84739.9+3%

40Winnebago County, IAIA10,25139.8+11%

41Allamakee County, IAIA14,23839.7+9%

42Chickasaw County, IAIA11,66339.7+11%

43Hancock County, IAIA10,52839.7+12%

44Monroe County, IAIA7,40639.7+6%

45Osceola County, IAIA5,98039.7+10%

46Emmet County, IAIA9,10739.6+10%

47Howard County, IAIA9,41539.5+6%

48Lee County, IAIA32,30639.5+10%

49Clay County, IAIA16,20239.4+12%

50Fayette County, IAIA19,04739.4+9%

51Cerro Gordo County, IAIA42,37239.3+11%

52Cedar County, IAIA18,35939.2+9%

53Wapello County, IAIA35,21039.2+5%

54Hamilton County, IAIA14,94439.1+5%

55Jackson County, IAIA19,28839.1+12%

56Tama County, IAIA16,79639.1+5%

57Des Moines County, IAIA38,07738.9+8%

58Harrison County, IAIA14,62338.9+6%

59Iowa County, IAIA16,50438.8+6%

60Washington County, IAIA22,66738.8+9%

61Carroll County, IAIA20,30338.7+13%

62Clarke County, IAIA9,57438.6+5%

63Boone County, IAIA26,79938.6+5%

64Marshall County, IAIA39,89038.6+5%

65Davis County, IAIA9,23038.5+7%

66Jasper County, IAIA38,15338.5+7%

67Jones County, IAIA21,25338.5+11%

68Poweshiek County, IAIA18,36838.4+11%

69Clinton County, IAIA46,00238.2+9%

70Crawford County, IAIA16,23738.2+8%

71Bremer County, IAIA25,29638.1+8%

72Lyon County, IAIA12,35438.1+9%

73Mills County, IAIA14,79338.1+9%

74Madison County, IAIA17,27037.9+5%

75Plymouth County, IAIA25,69737.8+11%

76Webster County, IAIA36,83837.7+6%

77Benton County, IAIA26,00437.2+7%

78Mahaska County, IAIA21,88037.2+7%

79Marion County, IAIA34,19237.2+9%

80Delaware County, IAIA17,67437.1+14%

81Henry County, IAIA19,34937.1+7%

82Pottawattamie County, IAIA92,99636.5+9%

83Dubuque County, IAIA99,38136.5+10%

84Decatur County, IAIA7,65536.4+3%

85Buchanan County, IAIA20,88336.4+9%

86Buena Vista County, IAIA20,44936.4+8%

87Muscatine County, IAIA41,85336.1+9%

88Warren County, IAIA57,33136.0+10%

89Louisa County, IAIA10,41635.9+5%

90Winneshiek County, IAIA19,73335.7+13%

91Scott County, IAIA175,25935.4+9%

92Linn County, IAIA232,02835.2+6%

93Dallas County, IAIA118,45735.1+1%

94Black Hawk County, IAIA131,53234.4+5%

95Polk County, IAIA516,54634.4+6%

96Woodbury County, IAIA106,64934.2+3%

97Sioux County, IAIA36,77432.8+6%

98Johnson County, IAIA160,04428.4+4%

99Story County, IAIA101,29126.5+2%

SHOWING 1–99 OF 99

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS