RANKING · 1990 CENSUS · 99 SHOWN OF 99

Most racially diverse, Iowa counties · 1990

Iowa counties ranked by the CensusEasy Diversity Score (0 to 100), the chance two random residents are of a different 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

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

RANKPLACESTATEPOPDIVERSITY SCOREVS –

01Scott County, IAIA175,25921–

02Black Hawk County, IAIA131,53220–

03Polk County, IAIA516,54620–

04Muscatine County, IAIA41,85319–

05Woodbury County, IAIA106,64918–

06Johnson County, IAIA160,04417–

07Story County, IAIA101,29117–

08Tama County, IAIA16,79614–

09Lee County, IAIA32,30613–

10Des Moines County, IAIA38,07711–

11Louisa County, IAIA10,41610–

12Linn County, IAIA232,0289–

13Webster County, IAIA36,8388–

14Henry County, IAIA19,3498–

15Cerro Gordo County, IAIA42,3727–

16Pottawattamie County, IAIA92,9967–

17Buena Vista County, IAIA20,4497–

18Marshall County, IAIA39,8906–

19Clinton County, IAIA46,0026–

20Jefferson County, IAIA15,2916–

21Winnebago County, IAIA10,2516–

22Wapello County, IAIA35,2106–

23Jones County, IAIA21,2536–

24Crawford County, IAIA16,2375–

25Monroe County, IAIA7,4065–

26Marion County, IAIA34,1924–

27Hardin County, IAIA16,4554–

28Page County, IAIA14,8564–

29Poweshiek County, IAIA18,3684–

30Fayette County, IAIA19,0474–

31Jasper County, IAIA38,1534–

32Dubuque County, IAIA99,3814–

33Washington County, IAIA22,6674–

34Mahaska County, IAIA21,8804–

35Appanoose County, IAIA12,0774–

36Hamilton County, IAIA14,9443–

37Fremont County, IAIA6,5223–

38Decatur County, IAIA7,6553–

39Warren County, IAIA57,3313–

40Winneshiek County, IAIA19,7333–

41Cherokee County, IAIA11,3693–

42Worth County, IAIA7,3383–

43Sioux County, IAIA36,7743–

44Wright County, IAIA12,8013–

45Bremer County, IAIA25,2963–

46Taylor County, IAIA5,8353–

47Hancock County, IAIA10,5283–

48Dallas County, IAIA118,4573–

49Union County, IAIA11,8293–

50Lucas County, IAIA8,8473–

51Cedar County, IAIA18,3593–

52Ringgold County, IAIA4,6423–

53Franklin County, IAIA9,8683–

54Floyd County, IAIA14,9012–

55Boone County, IAIA26,7992–

56Calhoun County, IAIA9,5622–

57Greene County, IAIA8,6582–

58O'Brien County, IAIA14,2202–

59Shelby County, IAIA11,6892–

60Buchanan County, IAIA20,8832–

61Monona County, IAIA8,5392–

62Clarke County, IAIA9,5742–

63Delaware County, IAIA17,6742–

64Cass County, IAIA12,9602–

65Clay County, IAIA16,2022–

66Osceola County, IAIA5,9802–

67Mitchell County, IAIA10,6502–

68Pocahontas County, IAIA6,8192–

69Harrison County, IAIA14,6232–

70Madison County, IAIA17,2702–

71Mills County, IAIA14,7932–

72Benton County, IAIA26,0042–

73Sac County, IAIA9,5252–

74Davis County, IAIA9,2302–

75Dickinson County, IAIA18,0772–

76Emmet County, IAIA9,1072–

77Keokuk County, IAIA9,7972–

78Ida County, IAIA6,7772–

79Adair County, IAIA7,4032–

80Adams County, IAIA3,6172–

81Clayton County, IAIA16,8451–

82Kossuth County, IAIA14,3221–

83Palo Alto County, IAIA8,8991–

84Grundy County, IAIA12,3611–

85Guthrie County, IAIA10,7821–

86Lyon County, IAIA12,3541–

87Jackson County, IAIA19,2881–

88Humboldt County, IAIA9,4091–

89Howard County, IAIA9,4151–

90Iowa County, IAIA16,5041–

91Carroll County, IAIA20,3031–

92Plymouth County, IAIA25,6971–

93Wayne County, IAIA6,7381–

94Audubon County, IAIA5,5091–

95Butler County, IAIA14,0491–

96Allamakee County, IAIA14,2381–

97Van Buren County, IAIA7,1311–

98Chickasaw County, IAIA11,6631–

99Montgomery County, IAIA10,0021–

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)How this score is calculated

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