RANKING · 1990 CENSUS · 99 SHOWN OF 99

Least racially diverse, Iowa counties · 1990

Name: Least racially diverse, Iowa counties, 1990
Creator: CensusEasy
License: https://creativecommons.org/licenses/by/4.0/

Iowa counties with the lowest CensusEasy Diversity Score, where most residents share the same race or ethnicity (1990 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 3.

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IowaAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2024

RANKPLACESTATEPOPDIVERSITY SCOREVS –

01Montgomery County, IAIA10,0021–

02Chickasaw County, IAIA11,6631–

03Van Buren County, IAIA7,1311–

04Allamakee County, IAIA14,2381–

05Butler County, IAIA14,0491–

06Audubon County, IAIA5,5091–

07Wayne County, IAIA6,7381–

08Plymouth County, IAIA25,6971–

09Carroll County, IAIA20,3031–

10Iowa County, IAIA16,5041–

11Howard County, IAIA9,4151–

12Humboldt County, IAIA9,4091–

13Jackson County, IAIA19,2881–

14Lyon County, IAIA12,3541–

15Guthrie County, IAIA10,7821–

16Grundy County, IAIA12,3611–

17Palo Alto County, IAIA8,8991–

18Kossuth County, IAIA14,3221–

19Clayton County, IAIA16,8451–

20Adams County, IAIA3,6172–

21Adair County, IAIA7,4032–

22Ida County, IAIA6,7772–

23Keokuk County, IAIA9,7972–

24Emmet County, IAIA9,1072–

25Dickinson County, IAIA18,0772–

26Davis County, IAIA9,2302–

27Sac County, IAIA9,5252–

28Benton County, IAIA26,0042–

29Mills County, IAIA14,7932–

30Madison County, IAIA17,2702–

31Harrison County, IAIA14,6232–

32Pocahontas County, IAIA6,8192–

33Mitchell County, IAIA10,6502–

34Osceola County, IAIA5,9802–

35Clay County, IAIA16,2022–

36Cass County, IAIA12,9602–

37Delaware County, IAIA17,6742–

38Clarke County, IAIA9,5742–

39Monona County, IAIA8,5392–

40Buchanan County, IAIA20,8832–

41Shelby County, IAIA11,6892–

42O'Brien County, IAIA14,2202–

43Greene County, IAIA8,6582–

44Calhoun County, IAIA9,5622–

45Boone County, IAIA26,7992–

46Floyd County, IAIA14,9012–

47Franklin County, IAIA9,8683–

48Ringgold County, IAIA4,6423–

49Cedar County, IAIA18,3593–

50Lucas County, IAIA8,8473–

51Union County, IAIA11,8293–

52Dallas County, IAIA118,4573–

53Hancock County, IAIA10,5283–

54Taylor County, IAIA5,8353–

55Bremer County, IAIA25,2963–

56Wright County, IAIA12,8013–

57Sioux County, IAIA36,7743–

58Worth County, IAIA7,3383–

59Cherokee County, IAIA11,3693–

60Winneshiek County, IAIA19,7333–

61Warren County, IAIA57,3313–

62Decatur County, IAIA7,6553–

63Fremont County, IAIA6,5223–

64Hamilton County, IAIA14,9443–

65Appanoose County, IAIA12,0774–

66Mahaska County, IAIA21,8804–

67Washington County, IAIA22,6674–

68Dubuque County, IAIA99,3814–

69Jasper County, IAIA38,1534–

70Fayette County, IAIA19,0474–

71Poweshiek County, IAIA18,3684–

72Page County, IAIA14,8564–

73Hardin County, IAIA16,4554–

74Marion County, IAIA34,1924–

75Monroe County, IAIA7,4065–

76Crawford County, IAIA16,2375–

77Jones County, IAIA21,2536–

78Wapello County, IAIA35,2106–

79Winnebago County, IAIA10,2516–

80Jefferson County, IAIA15,2916–

81Clinton County, IAIA46,0026–

82Marshall County, IAIA39,8906–

83Buena Vista County, IAIA20,4497–

84Pottawattamie County, IAIA92,9967–

85Cerro Gordo County, IAIA42,3727–

86Henry County, IAIA19,3498–

87Webster County, IAIA36,8388–

88Linn County, IAIA232,0289–

89Louisa County, IAIA10,41610–

90Des Moines County, IAIA38,07711–

91Lee County, IAIA32,30613–

92Tama County, IAIA16,79614–

93Story County, IAIA101,29117–

94Johnson County, IAIA160,04417–

95Woodbury County, IAIA106,64918–

96Muscatine County, IAIA41,85319–

97Polk County, IAIA516,54620–

98Black Hawk County, IAIA131,53220–

99Scott County, IAIA175,25921–

SHOWING 1–99 OF 99

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