RANKING · 2020 CENSUS · 99 SHOWN OF 99

Most foreign-born residents, Iowa counties · 2020

Iowa counties ranked by the share of residents born outside the US (2023 ACS). This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

IowaAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDOldest by median age Youngest by median age Highest uninsured rate Most women Most men Highest disability rate

YEAR2010 2020 2024

RANKPLACESTATEPOPFOREIGN-BORNVS 2000

01Buena Vista County, IAIA20,44921.2%–

02Crawford County, IAIA16,23718.2%–

03Jefferson County, IAIA15,29113.1%–

04Marshall County, IAIA39,89012.7%–

05Johnson County, IAIA160,04411.6%–

06Story County, IAIA101,2919.7%–

07Louisa County, IAIA10,4169.3%–

08Polk County, IAIA516,5469.1%–

09Woodbury County, IAIA106,6498.8%–

10Dallas County, IAIA118,4578.6%–

11Wapello County, IAIA35,2107.9%–

12Clarke County, IAIA9,5747.0%–

13Muscatine County, IAIA41,8536.9%–

14Black Hawk County, IAIA131,5326.7%–

15Emmet County, IAIA9,1075.5%–

16Sioux County, IAIA36,7745.4%–

17Osceola County, IAIA5,9804.8%–

18Tama County, IAIA16,7964.8%–

19Linn County, IAIA232,0284.5%–

20Washington County, IAIA22,6674.4%–

21Scott County, IAIA175,2594.3%–

22Taylor County, IAIA5,8354.3%–

23Allamakee County, IAIA14,2384.3%–

24Hamilton County, IAIA14,9444.3%–

25Franklin County, IAIA9,8684.0%–

26Pottawattamie County, IAIA92,9963.9%–

27Henry County, IAIA19,3493.9%–

28Wright County, IAIA12,8013.9%–

29Floyd County, IAIA14,9013.6%–

30Plymouth County, IAIA25,6973.6%–

31Pocahontas County, IAIA6,8193.1%–

32Lucas County, IAIA8,8472.9%–

33O'Brien County, IAIA14,2202.9%–

34Webster County, IAIA36,8382.7%–

35Dubuque County, IAIA99,3812.7%–

36Hardin County, IAIA16,4552.6%–

37Poweshiek County, IAIA18,3682.6%–

38Clayton County, IAIA16,8452.6%–

39Jasper County, IAIA38,1532.4%–

40Decatur County, IAIA7,6552.4%–

41Shelby County, IAIA11,6892.3%–

42Winnebago County, IAIA10,2512.2%–

43Cerro Gordo County, IAIA42,3722.2%–

44Humboldt County, IAIA9,4092.2%–

45Page County, IAIA14,8562.1%–

46Carroll County, IAIA20,3032.0%–

47Clay County, IAIA16,2022.0%–

48Winneshiek County, IAIA19,7332.0%–

49Chickasaw County, IAIA11,6632.0%–

50Lyon County, IAIA12,3542.0%–

51Palo Alto County, IAIA8,8992.0%–

52Greene County, IAIA8,6582.0%–

53Mahaska County, IAIA21,8801.9%–

54Des Moines County, IAIA38,0771.9%–

55Dickinson County, IAIA18,0771.9%–

56Marion County, IAIA34,1921.9%–

57Sac County, IAIA9,5251.9%–

58Bremer County, IAIA25,2961.7%–

59Boone County, IAIA26,7991.7%–

60Kossuth County, IAIA14,3221.7%–

61Hancock County, IAIA10,5281.7%–

62Union County, IAIA11,8291.7%–

63Fremont County, IAIA6,5221.7%–

64Adair County, IAIA7,4031.7%–

65Calhoun County, IAIA9,5621.6%–

66Cedar County, IAIA18,3591.6%–

67Warren County, IAIA57,3311.6%–

68Clinton County, IAIA46,0021.5%–

69Van Buren County, IAIA7,1311.5%–

70Guthrie County, IAIA10,7821.5%–

71Davis County, IAIA9,2301.4%–

72Mills County, IAIA14,7931.4%–

73Ida County, IAIA6,7771.4%–

74Howard County, IAIA9,4151.4%–

75Cherokee County, IAIA11,3691.3%–

76Grundy County, IAIA12,3611.3%–

77Fayette County, IAIA19,0471.3%–

78Cass County, IAIA12,9601.3%–

79Butler County, IAIA14,0491.2%–

80Lee County, IAIA32,3061.2%–

81Jones County, IAIA21,2531.1%–

82Mitchell County, IAIA10,6501.1%–

83Jackson County, IAIA19,2881.1%–

84Iowa County, IAIA16,5041.0%–

85Ringgold County, IAIA4,6421.0%–

86Wayne County, IAIA6,7381.0%–

87Keokuk County, IAIA9,7971.0%–

88Adams County, IAIA3,6170.9%–

89Madison County, IAIA17,2700.8%–

90Benton County, IAIA26,0040.8%–

91Worth County, IAIA7,3380.8%–

92Delaware County, IAIA17,6740.7%–

93Buchanan County, IAIA20,8830.7%–

94Monroe County, IAIA7,4060.7%–

95Montgomery County, IAIA10,0020.6%–

96Appanoose County, IAIA12,0770.6%–

97Harrison County, IAIA14,6230.5%–

98Audubon County, IAIA5,5090.4%–

99Monona County, IAIA8,5390.3%–

SHOWING 1–99 OF 99

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