RANKING · 1990 CENSUS · 99 SHOWN OF 99

Least racially diverse, Iowa counties · 1990

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

01Montgomery County, IAIA10,0021−84%

02Chickasaw County, IAIA11,6631−67%

03Van Buren County, IAIA7,1311−67%

04Allamakee County, IAIA14,2381−90%

05Butler County, IAIA14,0491−53%

06Audubon County, IAIA5,5091−48%

07Wayne County, IAIA6,7381−48%

08Humboldt County, IAIA9,4091−61%

09Carroll County, IAIA20,3031−52%

10Plymouth County, IAIA25,6971−72%

11Iowa County, IAIA16,5041−63%

12Howard County, IAIA9,4151−33%

13Lyon County, IAIA12,3541+1%

14Palo Alto County, IAIA8,8992−47%

15Jackson County, IAIA19,2882−22%

16Adams County, IAIA3,6172−24%

17Guthrie County, IAIA10,7822−53%

18Clayton County, IAIA16,8452−34%

19Grundy County, IAIA12,3612−30%

20Emmet County, IAIA9,1072−85%

21Adair County, IAIA7,4032−29%

22Keokuk County, IAIA9,7972−11%

23Mitchell County, IAIA10,6502−18%

24Benton County, IAIA26,0042−23%

25Dickinson County, IAIA18,0772−21%

26Pocahontas County, IAIA6,8192−41%

27Harrison County, IAIA14,6232−20%

28Kossuth County, IAIA14,3222−37%

29Clarke County, IAIA9,5742−81%

30Mills County, IAIA14,7932−53%

31Monona County, IAIA8,5392−7%

32Sac County, IAIA9,5252−36%

33Clay County, IAIA16,2022−59%

34Delaware County, IAIA17,6742+1%

35Ida County, IAIA6,7772+9%

36Shelby County, IAIA11,6892−14%

37O'Brien County, IAIA14,2202−64%

38Buchanan County, IAIA20,8832−22%

39Boone County, IAIA26,7993−25%

40Greene County, IAIA8,6583−49%

41Cass County, IAIA12,9603−1%

42Ringgold County, IAIA4,6423+99%

43Madison County, IAIA17,2703+2%

44Calhoun County, IAIA9,5623−41%

45Union County, IAIA11,8293−28%

46Davis County, IAIA9,2303+9%

47Lucas County, IAIA8,8473−9%

48Osceola County, IAIA5,9803−43%

49Floyd County, IAIA14,9013−39%

50Dallas County, IAIA118,4573−81%

51Bremer County, IAIA25,2963−19%

52Cherokee County, IAIA11,3693−25%

53Sioux County, IAIA36,7743−60%

54Taylor County, IAIA5,8353−67%

55Winneshiek County, IAIA19,7333−37%

56Wright County, IAIA12,8013−73%

57Appanoose County, IAIA12,0774−16%

58Cedar County, IAIA18,3594+0%

59Decatur County, IAIA7,6554−56%

60Warren County, IAIA57,3314−13%

61Franklin County, IAIA9,8684−74%

62Dubuque County, IAIA99,3814−39%

63Jasper County, IAIA38,1534−29%

64Hamilton County, IAIA14,9444−47%

65Mahaska County, IAIA21,8804−30%

66Hancock County, IAIA10,5284−41%

67Page County, IAIA14,8564−54%

68Worth County, IAIA7,3384−14%

69Poweshiek County, IAIA18,3684−39%

70Washington County, IAIA22,6674−45%

71Monroe County, IAIA7,4065+64%

72Marion County, IAIA34,1925−18%

73Fayette County, IAIA19,0475−23%

74Hardin County, IAIA16,4555−40%

75Crawford County, IAIA16,2375−78%

76Fremont County, IAIA6,5225−17%

77Jefferson County, IAIA15,2916−41%

78Winnebago County, IAIA10,2516−15%

79Clinton County, IAIA46,0026−31%

80Wapello County, IAIA35,2106−31%

81Jones County, IAIA21,2537−13%

82Marshall County, IAIA39,8907−71%

83Buena Vista County, IAIA20,4497−80%

84Pottawattamie County, IAIA92,9968−28%

85Cerro Gordo County, IAIA42,3729−18%

86Henry County, IAIA19,3499−24%

87Webster County, IAIA36,8389−40%

88Linn County, IAIA232,02810−25%

89Des Moines County, IAIA38,07712−14%

90Louisa County, IAIA10,41614−51%

91Lee County, IAIA32,30614+5%

92Tama County, IAIA16,79615+37%

93Story County, IAIA101,29118−10%

94Johnson County, IAIA160,04418−19%

95Black Hawk County, IAIA131,53220−18%

96Woodbury County, IAIA106,64921−33%

97Polk County, IAIA516,54621−23%

98Scott County, IAIA175,25923−13%

99Muscatine County, IAIA41,85326−12%

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