RANKING · 2024 ACS · 99 SHOWN OF 99

Least racially diverse, Iowa counties

Iowa counties with the lowest CensusEasy Diversity Score, where most residents share the same race or ethnicity (2023 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

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IowaAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPDIVERSITY SCOREVS 2000

01Mitchell County, IAIA10,65012+413%

02Buchanan County, IAIA20,88312+281%

03Clayton County, IAIA16,84512+388%

04Grundy County, IAIA12,36112+425%

05Monroe County, IAIA7,40613+359%

06Ringgold County, IAIA4,64213+900%

07Keokuk County, IAIA9,79713+526%

08Butler County, IAIA14,04913+503%

09Adams County, IAIA3,61713+558%

10Benton County, IAIA26,00413+446%

11Harrison County, IAIA14,62313+457%

12Van Buren County, IAIA7,13114+396%

13Madison County, IAIA17,27014+446%

14Delaware County, IAIA17,67414+558%

15Lucas County, IAIA8,84714+350%

16Davis County, IAIA9,23015+451%

17Audubon County, IAIA5,50915+632%

18Wayne County, IAIA6,73815+546%

19Appanoose County, IAIA12,07715+260%

20Jackson County, IAIA19,28815+674%

21Cass County, IAIA12,96016+503%

22Lyon County, IAIA12,35416+1007%

23Dickinson County, IAIA18,07716+558%

24Marion County, IAIA34,19216+188%

25Worth County, IAIA7,33816+227%

26Winneshiek County, IAIA19,73316+207%

27Cedar County, IAIA18,35916+363%

28Adair County, IAIA7,40317+559%

29Howard County, IAIA9,41517+700%

30Boone County, IAIA26,79917+404%

31Monona County, IAIA8,53917+652%

32Mills County, IAIA14,79317+286%

33Chickasaw County, IAIA11,66318+649%

34Iowa County, IAIA16,50418+400%

35Guthrie County, IAIA10,78218+445%

36Greene County, IAIA8,65818+265%

37Bremer County, IAIA25,29618+384%

38Montgomery County, IAIA10,00219+371%

39Carroll County, IAIA20,30319+636%

40Warren County, IAIA57,33119+344%

41Sac County, IAIA9,52519+470%

42Union County, IAIA11,82919+417%

43Kossuth County, IAIA14,32219+519%

44Mahaska County, IAIA21,88020+244%

45Ida County, IAIA6,77720+879%

46Jones County, IAIA21,25320+168%

47Fremont County, IAIA6,52220+237%

48Calhoun County, IAIA9,56220+365%

49Shelby County, IAIA11,68920+687%

50Palo Alto County, IAIA8,89921+616%

51Clay County, IAIA16,20221+298%

52Fayette County, IAIA19,04721+258%

53Jasper County, IAIA38,15322+286%

54Humboldt County, IAIA9,40922+614%

55Page County, IAIA14,85623+151%

56Lee County, IAIA32,30623+69%

57Hancock County, IAIA10,52823+228%

58Decatur County, IAIA7,65523+187%

59Hardin County, IAIA16,45523+185%

60Poweshiek County, IAIA18,36824+243%

61Taylor County, IAIA5,83525+153%

62Clinton County, IAIA46,00225+184%

63Winnebago County, IAIA10,25126+259%

64Washington County, IAIA22,66726+224%

65Cherokee County, IAIA11,36926+522%

66Pocahontas County, IAIA6,81926+705%

67Floyd County, IAIA14,90126+441%

68Cerro Gordo County, IAIA42,37227+162%

69Dubuque County, IAIA99,38127+323%

70Plymouth County, IAIA25,69727+498%

71O'Brien County, IAIA14,22030+366%

72Allamakee County, IAIA14,23830+215%

73Henry County, IAIA19,34931+179%

74Emmet County, IAIA9,10733+182%

75Pottawattamie County, IAIA92,99634+211%

76Des Moines County, IAIA38,07735+146%

77Osceola County, IAIA5,98035+577%

78Hamilton County, IAIA14,94436+367%

79Webster County, IAIA36,83836+135%

80Sioux County, IAIA36,77437+352%

81Jefferson County, IAIA15,29139+281%

82Linn County, IAIA232,02839+201%

83Franklin County, IAIA9,86841+179%

84Story County, IAIA101,29142+108%

85Dallas County, IAIA118,45742+161%

86Tama County, IAIA16,79646+326%

87Clarke County, IAIA9,57446+324%

88Black Hawk County, IAIA131,53247+89%

89Louisa County, IAIA10,41647+66%

90Wright County, IAIA12,80149+287%

91Scott County, IAIA175,25949+81%

92Muscatine County, IAIA41,85350+69%

93Wapello County, IAIA35,21051+446%

94Johnson County, IAIA160,04453+136%

95Polk County, IAIA516,54656+102%

96Marshall County, IAIA39,89063+156%

97Woodbury County, IAIA106,64963+104%

98Crawford County, IAIA16,23765+184%

99Buena Vista County, IAIA20,44979+112%

SHOWING 1–99 OF 99

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

UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES