RANKING · 1990 CENSUS · 99 SHOWN OF 99

Most graduate degrees, Iowa counties · 1990

Iowa counties ranked by the 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.

Flip the list · Fewest graduate degrees, US counties →

IowaAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDMost college graduates Most educated Least educated Fewest graduate degrees

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPGRADUATE DEGREEVS –

01Johnson County, IAIA160,04420.0%–

02Story County, IAIA101,29117.3%–

03Jefferson County, IAIA15,29111.2%–

04Polk County, IAIA516,5467.3%–

05Scott County, IAIA175,2596.4%–

06Poweshiek County, IAIA18,3686.3%–

07Linn County, IAIA232,0285.7%–

08Black Hawk County, IAIA131,5325.7%–

09Dubuque County, IAIA99,3815.1%–

10Winneshiek County, IAIA19,7335.0%–

11Decatur County, IAIA7,6555.0%–

12Sioux County, IAIA36,7745.0%–

13Dickinson County, IAIA18,0774.9%–

14Woodbury County, IAIA106,6494.8%–

15Cerro Gordo County, IAIA42,3724.6%–

16Marshall County, IAIA39,8904.6%–

17Warren County, IAIA57,3314.4%–

18Bremer County, IAIA25,2964.4%–

19Plymouth County, IAIA25,6974.2%–

20Dallas County, IAIA118,4574.1%–

21Page County, IAIA14,8563.9%–

22Mahaska County, IAIA21,8803.9%–

23Des Moines County, IAIA38,0773.9%–

24Henry County, IAIA19,3493.8%–

25Webster County, IAIA36,8383.8%–

26Union County, IAIA11,8293.8%–

27Osceola County, IAIA5,9803.8%–

28Floyd County, IAIA14,9013.7%–

29O'Brien County, IAIA14,2203.7%–

30Ringgold County, IAIA4,6423.6%–

31Buena Vista County, IAIA20,4493.6%–

32Wapello County, IAIA35,2103.6%–

33Madison County, IAIA17,2703.5%–

34Cass County, IAIA12,9603.5%–

35Muscatine County, IAIA41,8533.5%–

36Clinton County, IAIA46,0023.5%–

37Fayette County, IAIA19,0473.5%–

38Marion County, IAIA34,1923.5%–

39Greene County, IAIA8,6583.4%–

40Boone County, IAIA26,7993.4%–

41Lee County, IAIA32,3063.4%–

42Cedar County, IAIA18,3593.4%–

43Adams County, IAIA3,6173.3%–

44Franklin County, IAIA9,8683.3%–

45Pottawattamie County, IAIA92,9963.3%–

46Hardin County, IAIA16,4553.3%–

47Jasper County, IAIA38,1533.1%–

48Pocahontas County, IAIA6,8193.1%–

49Iowa County, IAIA16,5043.1%–

50Shelby County, IAIA11,6893.1%–

51Calhoun County, IAIA9,5623.1%–

52Humboldt County, IAIA9,4093.1%–

53Allamakee County, IAIA14,2383.0%–

54Monroe County, IAIA7,4063.0%–

55Jackson County, IAIA19,2883.0%–

56Appanoose County, IAIA12,0773.0%–

57Carroll County, IAIA20,3033.0%–

58Washington County, IAIA22,6673.0%–

59Mills County, IAIA14,7933.0%–

60Grundy County, IAIA12,3612.9%–

61Guthrie County, IAIA10,7822.9%–

62Buchanan County, IAIA20,8832.9%–

63Hamilton County, IAIA14,9442.9%–

64Kossuth County, IAIA14,3222.9%–

65Tama County, IAIA16,7962.9%–

66Delaware County, IAIA17,6742.9%–

67Davis County, IAIA9,2302.8%–

68Montgomery County, IAIA10,0022.8%–

69Jones County, IAIA21,2532.8%–

70Sac County, IAIA9,5252.8%–

71Wright County, IAIA12,8012.8%–

72Palo Alto County, IAIA8,8992.8%–

73Hancock County, IAIA10,5282.8%–

74Taylor County, IAIA5,8352.8%–

75Wayne County, IAIA6,7382.7%–

76Audubon County, IAIA5,5092.7%–

77Crawford County, IAIA16,2372.6%–

78Fremont County, IAIA6,5222.6%–

79Cherokee County, IAIA11,3692.6%–

80Winnebago County, IAIA10,2512.6%–

81Chickasaw County, IAIA11,6632.6%–

82Van Buren County, IAIA7,1312.5%–

83Worth County, IAIA7,3382.5%–

84Butler County, IAIA14,0492.5%–

85Clayton County, IAIA16,8452.5%–

86Harrison County, IAIA14,6232.5%–

87Emmet County, IAIA9,1072.4%–

88Clay County, IAIA16,2022.4%–

89Keokuk County, IAIA9,7972.4%–

90Louisa County, IAIA10,4162.4%–

91Mitchell County, IAIA10,6502.4%–

92Benton County, IAIA26,0042.4%–

93Monona County, IAIA8,5392.4%–

94Lyon County, IAIA12,3542.3%–

95Clarke County, IAIA9,5742.2%–

96Adair County, IAIA7,4032.1%–

97Howard County, IAIA9,4152.1%–

98Lucas County, IAIA8,8471.9%–

99Ida County, IAIA6,7771.7%–

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

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