RANKING · 1990 CENSUS · 99 SHOWN OF 99

Fewest graduate degrees, Iowa counties · 1990

Iowa counties with the smallest share of adults 25+ holding a graduate or professional degree (1990 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 3.1%.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPGRADUATE DEGREEVS –

01Ida County, IAIA6,7771.7%–

02Lucas County, IAIA8,8471.9%–

03Howard County, IAIA9,4152.1%–

04Adair County, IAIA7,4032.1%–

05Clarke County, IAIA9,5742.2%–

06Lyon County, IAIA12,3542.3%–

07Monona County, IAIA8,5392.4%–

08Benton County, IAIA26,0042.4%–

09Mitchell County, IAIA10,6502.4%–

10Louisa County, IAIA10,4162.4%–

11Keokuk County, IAIA9,7972.4%–

12Clay County, IAIA16,2022.4%–

13Emmet County, IAIA9,1072.4%–

14Harrison County, IAIA14,6232.5%–

15Clayton County, IAIA16,8452.5%–

16Butler County, IAIA14,0492.5%–

17Worth County, IAIA7,3382.5%–

18Van Buren County, IAIA7,1312.5%–

19Chickasaw County, IAIA11,6632.6%–

20Winnebago County, IAIA10,2512.6%–

21Cherokee County, IAIA11,3692.6%–

22Fremont County, IAIA6,5222.6%–

23Crawford County, IAIA16,2372.6%–

24Audubon County, IAIA5,5092.7%–

25Wayne County, IAIA6,7382.7%–

26Taylor County, IAIA5,8352.8%–

27Hancock County, IAIA10,5282.8%–

28Palo Alto County, IAIA8,8992.8%–

29Wright County, IAIA12,8012.8%–

30Sac County, IAIA9,5252.8%–

31Jones County, IAIA21,2532.8%–

32Montgomery County, IAIA10,0022.8%–

33Davis County, IAIA9,2302.8%–

34Delaware County, IAIA17,6742.9%–

35Tama County, IAIA16,7962.9%–

36Kossuth County, IAIA14,3222.9%–

37Hamilton County, IAIA14,9442.9%–

38Buchanan County, IAIA20,8832.9%–

39Guthrie County, IAIA10,7822.9%–

40Grundy County, IAIA12,3612.9%–

41Mills County, IAIA14,7933.0%–

42Washington County, IAIA22,6673.0%–

43Carroll County, IAIA20,3033.0%–

44Appanoose County, IAIA12,0773.0%–

45Jackson County, IAIA19,2883.0%–

46Monroe County, IAIA7,4063.0%–

47Allamakee County, IAIA14,2383.0%–

48Humboldt County, IAIA9,4093.1%–

49Calhoun County, IAIA9,5623.1%–

50Shelby County, IAIA11,6893.1%–

51Iowa County, IAIA16,5043.1%–

52Pocahontas County, IAIA6,8193.1%–

53Jasper County, IAIA38,1533.1%–

54Hardin County, IAIA16,4553.3%–

55Pottawattamie County, IAIA92,9963.3%–

56Franklin County, IAIA9,8683.3%–

57Adams County, IAIA3,6173.3%–

58Cedar County, IAIA18,3593.4%–

59Lee County, IAIA32,3063.4%–

60Boone County, IAIA26,7993.4%–

61Greene County, IAIA8,6583.4%–

62Marion County, IAIA34,1923.5%–

63Fayette County, IAIA19,0473.5%–

64Clinton County, IAIA46,0023.5%–

65Muscatine County, IAIA41,8533.5%–

66Cass County, IAIA12,9603.5%–

67Madison County, IAIA17,2703.5%–

68Wapello County, IAIA35,2103.6%–

69Buena Vista County, IAIA20,4493.6%–

70Ringgold County, IAIA4,6423.6%–

71O'Brien County, IAIA14,2203.7%–

72Floyd County, IAIA14,9013.7%–

73Osceola County, IAIA5,9803.8%–

74Union County, IAIA11,8293.8%–

75Webster County, IAIA36,8383.8%–

76Henry County, IAIA19,3493.8%–

77Des Moines County, IAIA38,0773.9%–

78Mahaska County, IAIA21,8803.9%–

79Page County, IAIA14,8563.9%–

80Dallas County, IAIA118,4574.1%–

81Plymouth County, IAIA25,6974.2%–

82Bremer County, IAIA25,2964.4%–

83Warren County, IAIA57,3314.4%–

84Marshall County, IAIA39,8904.6%–

85Cerro Gordo County, IAIA42,3724.6%–

86Woodbury County, IAIA106,6494.8%–

87Dickinson County, IAIA18,0774.9%–

88Sioux County, IAIA36,7745.0%–

89Decatur County, IAIA7,6555.0%–

90Winneshiek County, IAIA19,7335.0%–

91Dubuque County, IAIA99,3815.1%–

92Black Hawk County, IAIA131,5325.7%–

93Linn County, IAIA232,0285.7%–

94Poweshiek County, IAIA18,3686.3%–

95Scott County, IAIA175,2596.4%–

96Polk County, IAIA516,5467.3%–

97Jefferson County, IAIA15,29111.2%–

98Story County, IAIA101,29117.3%–

99Johnson County, IAIA160,04420.0%–

SHOWING 1–99 OF 99

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