RANKING · 2020 CENSUS · 99 SHOWN OF 99

Most segregated, Iowa counties · 2020

Iowa counties ranked by the CensusEasy Segregation Score, the White vs non-White index of dissimilarity across census tracts (2020 ACS). Higher means residents are more sorted into separate neighborhoods. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 23.

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

RANKPLACESTATEPOPSEGREGATION SCOREVS –

01Allamakee County, IAIA14,23859–

02Crawford County, IAIA16,23750–

03Buena Vista County, IAIA20,44948–

04Black Hawk County, IAIA131,53244–

05Tama County, IAIA16,79643–

06Floyd County, IAIA14,90143–

07Sac County, IAIA9,52543–

08Woodbury County, IAIA106,64942–

09Clarke County, IAIA9,57440–

10Jones County, IAIA21,25340–

11Audubon County, IAIA5,50939–

12Louisa County, IAIA10,41637–

13Taylor County, IAIA5,83537–

14Marshall County, IAIA39,89037–

15Hamilton County, IAIA14,94437–

16Polk County, IAIA516,54636–

17Henry County, IAIA19,34936–

18Poweshiek County, IAIA18,36836–

19Wapello County, IAIA35,21035–

20Clayton County, IAIA16,84535–

21Bremer County, IAIA25,29635–

22Jasper County, IAIA38,15335–

23Des Moines County, IAIA38,07734–

24Story County, IAIA101,29134–

25Lee County, IAIA32,30634–

26Dallas County, IAIA118,45733–

27Marion County, IAIA34,19233–

28Webster County, IAIA36,83833–

29Linn County, IAIA232,02832–

30Pottawattamie County, IAIA92,99631–

31Howard County, IAIA9,41530–

32Washington County, IAIA22,66730–

33Clinton County, IAIA46,00229–

34Wright County, IAIA12,80129–

35Franklin County, IAIA9,86828–

36Monona County, IAIA8,53928–

37Jefferson County, IAIA15,29128–

38Scott County, IAIA175,25928–

39Dubuque County, IAIA99,38128–

40Jackson County, IAIA19,28828–

41Cass County, IAIA12,96027–

42Johnson County, IAIA160,04427–

43Page County, IAIA14,85626–

44Ida County, IAIA6,77726–

45Muscatine County, IAIA41,85326–

46Cherokee County, IAIA11,36926–

47Cedar County, IAIA18,35925–

48Harrison County, IAIA14,62325–

49Sioux County, IAIA36,77424–

50Lucas County, IAIA8,84723–

51Union County, IAIA11,82923–

52Hardin County, IAIA16,45523–

53Buchanan County, IAIA20,88323–

54Cerro Gordo County, IAIA42,37222–

55Grundy County, IAIA12,36122–

56Winneshiek County, IAIA19,73322–

57Boone County, IAIA26,79922–

58Decatur County, IAIA7,65521–

59Humboldt County, IAIA9,40921–

60Warren County, IAIA57,33121–

61Winnebago County, IAIA10,25121–

62Clay County, IAIA16,20220–

63Mahaska County, IAIA21,88020–

64Hancock County, IAIA10,52820–

65Emmet County, IAIA9,10719–

66Calhoun County, IAIA9,56219–

67Shelby County, IAIA11,68919–

68Adams County, IAIA3,61719–

69Adair County, IAIA7,40318–

70Iowa County, IAIA16,50418–

71Palo Alto County, IAIA8,89918–

72Chickasaw County, IAIA11,66317–

73Plymouth County, IAIA25,69716–

74Madison County, IAIA17,27016–

75Ringgold County, IAIA4,64216–

76Keokuk County, IAIA9,79715–

77Fayette County, IAIA19,04715–

78Butler County, IAIA14,04915–

79Montgomery County, IAIA10,00215–

80Dickinson County, IAIA18,07714–

81Benton County, IAIA26,00414–

82Monroe County, IAIA7,40614–

83Worth County, IAIA7,33813–

84Kossuth County, IAIA14,32213–

85Appanoose County, IAIA12,07712–

86Carroll County, IAIA20,30311–

87O'Brien County, IAIA14,22011–

88Greene County, IAIA8,65810–

89Wayne County, IAIA6,7388–

90Davis County, IAIA9,2307–

91Mills County, IAIA14,7937–

92Pocahontas County, IAIA6,8197–

93Mitchell County, IAIA10,6506–

94Van Buren County, IAIA7,1315–

95Delaware County, IAIA17,6744–

96Lyon County, IAIA12,3543–

97Osceola County, IAIA5,9803–

98Guthrie County, IAIA10,7823–

99Fremont County, IAIA6,5222–

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