RANKING · 1990 CENSUS · 99 SHOWN OF 99

Least educated, Iowa counties · 1990

Iowa counties with the smallest 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 –

01Monroe County, IAIA7,4068.0%–

02Howard County, IAIA9,4158.2%–

03Wayne County, IAIA6,7388.4%–

04Taylor County, IAIA5,8358.7%–

05Clarke County, IAIA9,5748.8%–

06Allamakee County, IAIA14,2388.9%–

07Clayton County, IAIA16,8459.0%–

08Harrison County, IAIA14,6239.1%–

09Louisa County, IAIA10,4169.2%–

10Adams County, IAIA3,6179.4%–

11Keokuk County, IAIA9,7979.4%–

12Butler County, IAIA14,0499.4%–

13Lucas County, IAIA8,8479.5%–

14Van Buren County, IAIA7,1319.6%–

15Benton County, IAIA26,0049.6%–

16Audubon County, IAIA5,5099.8%–

17Adair County, IAIA7,4039.8%–

18Crawford County, IAIA16,2379.8%–

19Guthrie County, IAIA10,7829.9%–

20Chickasaw County, IAIA11,6639.9%–

21Osceola County, IAIA5,98010.0%–

22Jackson County, IAIA19,28810.0%–

23Lyon County, IAIA12,35410.2%–

24Ringgold County, IAIA4,64210.3%–

25Hancock County, IAIA10,52810.3%–

26Monona County, IAIA8,53910.3%–

27Davis County, IAIA9,23010.5%–

28Jones County, IAIA21,25310.6%–

29Lee County, IAIA32,30610.7%–

30Cherokee County, IAIA11,36910.8%–

31Worth County, IAIA7,33810.9%–

32Wapello County, IAIA35,21011.0%–

33Emmet County, IAIA9,10711.0%–

34Ida County, IAIA6,77711.0%–

35Pottawattamie County, IAIA92,99611.0%–

36Delaware County, IAIA17,67411.0%–

37Mitchell County, IAIA10,65011.1%–

38Iowa County, IAIA16,50411.1%–

39Buchanan County, IAIA20,88311.2%–

40Tama County, IAIA16,79611.2%–

41Carroll County, IAIA20,30311.3%–

42Fremont County, IAIA6,52211.3%–

43Wright County, IAIA12,80111.3%–

44Appanoose County, IAIA12,07711.5%–

45Humboldt County, IAIA9,40911.6%–

46Calhoun County, IAIA9,56211.6%–

47Washington County, IAIA22,66711.7%–

48Kossuth County, IAIA14,32211.8%–

49Fayette County, IAIA19,04711.8%–

50Madison County, IAIA17,27012.0%–

51Floyd County, IAIA14,90112.2%–

52Decatur County, IAIA7,65512.3%–

53Grundy County, IAIA12,36112.3%–

54Franklin County, IAIA9,86812.3%–

55Hardin County, IAIA16,45512.4%–

56Cass County, IAIA12,96012.5%–

57O'Brien County, IAIA14,22012.6%–

58Mills County, IAIA14,79312.6%–

59Sac County, IAIA9,52512.7%–

60Des Moines County, IAIA38,07712.7%–

61Jasper County, IAIA38,15312.7%–

62Cedar County, IAIA18,35912.8%–

63Montgomery County, IAIA10,00212.8%–

64Union County, IAIA11,82912.8%–

65Hamilton County, IAIA14,94412.8%–

66Shelby County, IAIA11,68912.8%–

67Pocahontas County, IAIA6,81912.8%–

68Palo Alto County, IAIA8,89912.8%–

69Marion County, IAIA34,19212.9%–

70Clinton County, IAIA46,00212.9%–

71Muscatine County, IAIA41,85313.0%–

72Mahaska County, IAIA21,88013.1%–

73Page County, IAIA14,85613.5%–

74Greene County, IAIA8,65813.7%–

75Webster County, IAIA36,83813.7%–

76Boone County, IAIA26,79913.7%–

77Winnebago County, IAIA10,25114.0%–

78Sioux County, IAIA36,77414.4%–

79Clay County, IAIA16,20214.5%–

80Henry County, IAIA19,34914.5%–

81Plymouth County, IAIA25,69715.0%–

82Bremer County, IAIA25,29615.1%–

83Buena Vista County, IAIA20,44915.2%–

84Cerro Gordo County, IAIA42,37215.5%–

85Marshall County, IAIA39,89015.8%–

86Warren County, IAIA57,33116.2%–

87Poweshiek County, IAIA18,36816.2%–

88Dallas County, IAIA118,45716.3%–

89Woodbury County, IAIA106,64916.7%–

90Dubuque County, IAIA99,38116.8%–

91Winneshiek County, IAIA19,73317.1%–

92Black Hawk County, IAIA131,53217.3%–

93Dickinson County, IAIA18,07717.5%–

94Linn County, IAIA232,02821.5%–

95Scott County, IAIA175,25921.9%–

96Polk County, IAIA516,54623.9%–

97Jefferson County, IAIA15,29126.5%–

98Story County, IAIA101,29138.4%–

99Johnson County, IAIA160,04444.0%–

SHOWING 1–99 OF 99

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