RANKING · 2020 CENSUS · 99 SHOWN OF 99

Least racially diverse, Iowa counties · 2020

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

01Butler County, IAIA14,0496+179%

02Grundy County, IAIA12,3617+181%

03Davis County, IAIA9,2308+182%

04Ringgold County, IAIA4,6428+510%

05Adams County, IAIA3,6178+317%

06Mitchell County, IAIA10,6509+283%

07Lucas County, IAIA8,8479+188%

08Van Buren County, IAIA7,1319+244%

09Cass County, IAIA12,96010+289%

10Clayton County, IAIA16,84510+305%

11Keokuk County, IAIA9,79710+389%

12Delaware County, IAIA17,67410+375%

13Madison County, IAIA17,27010+307%

14Buchanan County, IAIA20,88310+223%

15Harrison County, IAIA14,62311+336%

16Cedar County, IAIA18,35911+204%

17Howard County, IAIA9,41511+416%

18Jackson County, IAIA19,28811+450%

19Dickinson County, IAIA18,07711+368%

20Monroe County, IAIA7,40611+310%

21Wayne County, IAIA6,73811+389%

22Benton County, IAIA26,00411+367%

23Audubon County, IAIA5,50912+477%

24Adair County, IAIA7,40312+368%

25Fremont County, IAIA6,52212+105%

26Appanoose County, IAIA12,07712+200%

27Ida County, IAIA6,77713+513%

28Guthrie County, IAIA10,78213+281%

29Bremer County, IAIA25,29613+237%

30Sac County, IAIA9,52513+285%

31Winneshiek County, IAIA19,73313+149%

32Lyon County, IAIA12,35413+831%

33Worth County, IAIA7,33814+178%

34Greene County, IAIA8,65814+180%

35Marion County, IAIA34,19214+153%

36Shelby County, IAIA11,68914+442%

37Boone County, IAIA26,79914+319%

38Mills County, IAIA14,79314+221%

39Kossuth County, IAIA14,32214+359%

40Chickasaw County, IAIA11,66315+527%

41Union County, IAIA11,82915+304%

42Calhoun County, IAIA9,56215+243%

43Iowa County, IAIA16,50415+335%

44Carroll County, IAIA20,30315+499%

45Monona County, IAIA8,53916+594%

46Montgomery County, IAIA10,00216+290%

47Fayette County, IAIA19,04716+169%

48Humboldt County, IAIA9,40916+407%

49Jones County, IAIA21,25316+113%

50Warren County, IAIA57,33116+274%

51Palo Alto County, IAIA8,89917+508%

52Mahaska County, IAIA21,88017+202%

53Poweshiek County, IAIA18,36818+154%

54Decatur County, IAIA7,65518+123%

55Jasper County, IAIA38,15318+226%

56Clay County, IAIA16,20219+255%

57Hancock County, IAIA10,52819+178%

58Pocahontas County, IAIA6,81920+516%

59Cherokee County, IAIA11,36920+378%

60Hardin County, IAIA16,45520+149%

61Lee County, IAIA32,30620+52%

62Taylor County, IAIA5,83521+107%

63Page County, IAIA14,85621+129%

64O'Brien County, IAIA14,22021+235%

65Plymouth County, IAIA25,69721+362%

66Clinton County, IAIA46,00222+148%

67Winnebago County, IAIA10,25123+218%

68Washington County, IAIA22,66724+203%

69Cerro Gordo County, IAIA42,37225+141%

70Dubuque County, IAIA99,38126+301%

71Floyd County, IAIA14,90126+435%

72Allamakee County, IAIA14,23826+175%

73Emmet County, IAIA9,10728+139%

74Jefferson County, IAIA15,29128+177%

75Henry County, IAIA19,34929+155%

76Osceola County, IAIA5,98029+455%

77Hamilton County, IAIA14,94431+298%

78Pottawattamie County, IAIA92,99631+181%

79Des Moines County, IAIA38,07731+122%

80Webster County, IAIA36,83832+109%

81Sioux County, IAIA36,77435+330%

82Story County, IAIA101,29138+90%

83Linn County, IAIA232,02838+195%

84Franklin County, IAIA9,86838+161%

85Dallas County, IAIA118,45739+141%

86Clarke County, IAIA9,57442+283%

87Wright County, IAIA12,80143+241%

88Louisa County, IAIA10,41643+52%

89Tama County, IAIA16,79644+311%

90Wapello County, IAIA35,21045+388%

91Black Hawk County, IAIA131,53246+83%

92Scott County, IAIA175,25947+72%

93Muscatine County, IAIA41,85348+63%

94Johnson County, IAIA160,04451+125%

95Polk County, IAIA516,54653+91%

96Marshall County, IAIA39,89060+144%

97Woodbury County, IAIA106,64960+95%

98Crawford County, IAIA16,23761+170%

99Buena Vista County, IAIA20,44975+101%

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