RANKING · 1990 CENSUS · 99 SHOWN OF 99

Most educated, Iowa counties · 1990

Iowa counties ranked by the share of adults 25+ holding a bachelor's degree or higher (1990 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 12.0%.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPBACHELOR'S DEGREE OR HIGHERVS –

01Johnson County, IAIA160,04444.0%–

02Story County, IAIA101,29138.4%–

03Jefferson County, IAIA15,29126.5%–

04Polk County, IAIA516,54623.9%–

05Scott County, IAIA175,25921.9%–

06Linn County, IAIA232,02821.5%–

07Dickinson County, IAIA18,07717.5%–

08Black Hawk County, IAIA131,53217.3%–

09Winneshiek County, IAIA19,73317.1%–

10Dubuque County, IAIA99,38116.8%–

11Woodbury County, IAIA106,64916.7%–

12Dallas County, IAIA118,45716.3%–

13Poweshiek County, IAIA18,36816.2%–

14Warren County, IAIA57,33116.2%–

15Marshall County, IAIA39,89015.8%–

16Cerro Gordo County, IAIA42,37215.5%–

17Buena Vista County, IAIA20,44915.2%–

18Bremer County, IAIA25,29615.1%–

19Plymouth County, IAIA25,69715.0%–

20Henry County, IAIA19,34914.5%–

21Clay County, IAIA16,20214.5%–

22Sioux County, IAIA36,77414.4%–

23Winnebago County, IAIA10,25114.0%–

24Boone County, IAIA26,79913.7%–

25Webster County, IAIA36,83813.7%–

26Greene County, IAIA8,65813.7%–

27Page County, IAIA14,85613.5%–

28Mahaska County, IAIA21,88013.1%–

29Muscatine County, IAIA41,85313.0%–

30Clinton County, IAIA46,00212.9%–

31Marion County, IAIA34,19212.9%–

32Palo Alto County, IAIA8,89912.8%–

33Pocahontas County, IAIA6,81912.8%–

34Shelby County, IAIA11,68912.8%–

35Hamilton County, IAIA14,94412.8%–

36Union County, IAIA11,82912.8%–

37Montgomery County, IAIA10,00212.8%–

38Cedar County, IAIA18,35912.8%–

39Jasper County, IAIA38,15312.7%–

40Des Moines County, IAIA38,07712.7%–

41Sac County, IAIA9,52512.7%–

42Mills County, IAIA14,79312.6%–

43O'Brien County, IAIA14,22012.6%–

44Cass County, IAIA12,96012.5%–

45Hardin County, IAIA16,45512.4%–

46Franklin County, IAIA9,86812.3%–

47Grundy County, IAIA12,36112.3%–

48Decatur County, IAIA7,65512.3%–

49Floyd County, IAIA14,90112.2%–

50Madison County, IAIA17,27012.0%–

51Fayette County, IAIA19,04711.8%–

52Kossuth County, IAIA14,32211.8%–

53Washington County, IAIA22,66711.7%–

54Calhoun County, IAIA9,56211.6%–

55Humboldt County, IAIA9,40911.6%–

56Appanoose County, IAIA12,07711.5%–

57Wright County, IAIA12,80111.3%–

58Fremont County, IAIA6,52211.3%–

59Carroll County, IAIA20,30311.3%–

60Tama County, IAIA16,79611.2%–

61Buchanan County, IAIA20,88311.2%–

62Iowa County, IAIA16,50411.1%–

63Mitchell County, IAIA10,65011.1%–

64Delaware County, IAIA17,67411.0%–

65Pottawattamie County, IAIA92,99611.0%–

66Ida County, IAIA6,77711.0%–

67Emmet County, IAIA9,10711.0%–

68Wapello County, IAIA35,21011.0%–

69Worth County, IAIA7,33810.9%–

70Cherokee County, IAIA11,36910.8%–

71Lee County, IAIA32,30610.7%–

72Jones County, IAIA21,25310.6%–

73Davis County, IAIA9,23010.5%–

74Monona County, IAIA8,53910.3%–

75Hancock County, IAIA10,52810.3%–

76Ringgold County, IAIA4,64210.3%–

77Lyon County, IAIA12,35410.2%–

78Jackson County, IAIA19,28810.0%–

79Osceola County, IAIA5,98010.0%–

80Chickasaw County, IAIA11,6639.9%–

81Guthrie County, IAIA10,7829.9%–

82Crawford County, IAIA16,2379.8%–

83Adair County, IAIA7,4039.8%–

84Audubon County, IAIA5,5099.8%–

85Benton County, IAIA26,0049.6%–

86Van Buren County, IAIA7,1319.6%–

87Lucas County, IAIA8,8479.5%–

88Butler County, IAIA14,0499.4%–

89Keokuk County, IAIA9,7979.4%–

90Adams County, IAIA3,6179.4%–

91Louisa County, IAIA10,4169.2%–

92Harrison County, IAIA14,6239.1%–

93Clayton County, IAIA16,8459.0%–

94Allamakee County, IAIA14,2388.9%–

95Clarke County, IAIA9,5748.8%–

96Taylor County, IAIA5,8358.7%–

97Wayne County, IAIA6,7388.4%–

98Howard County, IAIA9,4158.2%–

99Monroe County, IAIA7,4068.0%–

SHOWING 1–99 OF 99

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