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.

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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 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS