RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest foreign-born population, Iowa counties · 2020

Iowa counties with the most residents born outside the United States, as of the 2020 American Community Survey. Ranked by number of people, not share. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

IowaAll states All rankings

SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPFOREIGN-BORN POPULATIONVS 2010

01Polk County, IAIA516,54644,744+33%

02Johnson County, IAIA160,04417,672+64%

03Linn County, IAIA232,02810,446+71%

04Story County, IAIA101,2919,567+33%

05Woodbury County, IAIA106,6499,330+15%

06Black Hawk County, IAIA131,5328,780+51%

07Dallas County, IAIA118,4578,554+102%

08Scott County, IAIA175,2597,587+31%

09Marshall County, IAIA39,8905,108+30%

10Buena Vista County, IAIA20,4494,407+42%

11Pottawattamie County, IAIA92,9963,695+18%

12Crawford County, IAIA16,2373,004+43%

13Muscatine County, IAIA41,8532,964−8%

14Wapello County, IAIA35,2102,810+42%

15Dubuque County, IAIA99,3812,723+72%

16Jefferson County, IAIA15,2912,044−2%

17Sioux County, IAIA36,7741,925−4%

18Webster County, IAIA36,8381,016+25%

19Louisa County, IAIA10,4161,009+20%

20Washington County, IAIA22,667984+63%

21Cerro Gordo County, IAIA42,372957−3%

22Plymouth County, IAIA25,697916+184%

23Jasper County, IAIA38,153904+137%

24Warren County, IAIA57,331825+57%

25Tama County, IAIA16,796818+38%

26Henry County, IAIA19,349791−18%

27Des Moines County, IAIA38,077748−5%

28Clinton County, IAIA46,002707+20%

29Clarke County, IAIA9,574680+40%

30Hamilton County, IAIA14,944641+82%

31Marion County, IAIA34,192630+16%

32Allamakee County, IAIA14,238600−15%

33Floyd County, IAIA14,901562+92%

34Emmet County, IAIA9,107517+37%

35Wright County, IAIA12,801499−12%

36Poweshiek County, IAIA18,368490+13%

37Boone County, IAIA26,799464+116%

38Hardin County, IAIA16,455445+39%

39Clayton County, IAIA16,845436+42%

40Bremer County, IAIA25,296434+35%

41Mahaska County, IAIA21,880430+34%

42Carroll County, IAIA20,303423+223%

43Winneshiek County, IAIA19,733409−1%

44Lee County, IAIA32,306408−21%

45O'Brien County, IAIA14,220406+29%

46Franklin County, IAIA9,868400−30%

47Clay County, IAIA16,202334−1%

48Dickinson County, IAIA18,077334+85%

49Page County, IAIA14,856319+0%

50Osceola County, IAIA5,980298+66%

51Cedar County, IAIA18,359294+28%

52Shelby County, IAIA11,689266+343%

53Kossuth County, IAIA14,322257+152%

54Taylor County, IAIA5,835255+70%

55Lucas County, IAIA8,847252−9%

56Fayette County, IAIA19,047247+2%

57Chickasaw County, IAIA11,663241+21%

58Lyon County, IAIA12,354238+198%

59Winnebago County, IAIA10,251238−29%

60Jones County, IAIA21,253230+28%

61Pocahontas County, IAIA6,819221+146%

62Humboldt County, IAIA9,409211+36%

63Mills County, IAIA14,793209−18%

64Union County, IAIA11,829206+212%

65Jackson County, IAIA19,288206+69%

66Benton County, IAIA26,004196−23%

67Hancock County, IAIA10,528184+12%

68Sac County, IAIA9,525184−5%

69Decatur County, IAIA7,655182−19%

70Butler County, IAIA14,049179+34%

71Palo Alto County, IAIA8,899177+200%

72Iowa County, IAIA16,504174+76%

73Greene County, IAIA8,658171+34%

74Cass County, IAIA12,960166−2%

75Grundy County, IAIA12,361164+204%

76Calhoun County, IAIA9,562161+140%

77Guthrie County, IAIA10,782156+31%

78Cherokee County, IAIA11,369155+11%

79Buchanan County, IAIA20,883143−14%

80Madison County, IAIA17,270137+36%

81Davis County, IAIA9,230132+154%

82Howard County, IAIA9,415131+42%

83Delaware County, IAIA17,674129+84%

84Adair County, IAIA7,403124+218%

85Mitchell County, IAIA10,650114+2%

86Fremont County, IAIA6,522112+37%

87Van Buren County, IAIA7,131107+32%

88Keokuk County, IAIA9,797101+17%

89Ida County, IAIA6,77799+111%

90Appanoose County, IAIA12,07772−14%

91Harrison County, IAIA14,62369−49%

92Wayne County, IAIA6,73866−64%

93Montgomery County, IAIA10,00264−70%

94Worth County, IAIA7,33856+4%

95Monroe County, IAIA7,40651−58%

96Ringgold County, IAIA4,64248−47%

97Adams County, IAIA3,61734+143%

98Monona County, IAIA8,53929−68%

99Audubon County, IAIA5,50923−43%

SHOWING 1–99 OF 99

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS