RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest American population, Iowa counties · 2020

Iowa counties ranked by the number of residents who are American ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDHighest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share Largest Iraqi population

YEAR2010 2020 2024

RANKPLACESTATEPOPAMERICAN POPULATIONVS 2010

01Polk County, IAIA516,54618,900−0%

02Linn County, IAIA232,0289,353+4%

03Scott County, IAIA175,2596,913−26%

04Black Hawk County, IAIA131,5325,619−38%

05Johnson County, IAIA160,0445,493+20%

06Pottawattamie County, IAIA92,9964,765+11%

07Dubuque County, IAIA99,3814,534−12%

08Woodbury County, IAIA106,6493,796−8%

09Dallas County, IAIA118,4573,765+3%

10Story County, IAIA101,2912,570−4%

11Wapello County, IAIA35,2102,525−30%

12Des Moines County, IAIA38,0772,391−36%

13Warren County, IAIA57,3312,390−22%

14Jasper County, IAIA38,1532,388−5%

15Clinton County, IAIA46,0022,242−30%

16Muscatine County, IAIA41,8532,060−21%

17Lee County, IAIA32,3061,956−42%

18Fayette County, IAIA19,0471,760+16%

19Marion County, IAIA34,1921,707−32%

20Cerro Gordo County, IAIA42,3721,675−1%

21Webster County, IAIA36,8381,665+36%

22Washington County, IAIA22,6671,644+6%

23Benton County, IAIA26,0041,628+49%

24Mahaska County, IAIA21,8801,586−15%

25Marshall County, IAIA39,8901,430−28%

26Buchanan County, IAIA20,8831,368−7%

27Bremer County, IAIA25,2961,290−11%

28Henry County, IAIA19,3491,263−33%

29Sioux County, IAIA36,7741,183+4%

30Jefferson County, IAIA15,2911,079+5%

31Cedar County, IAIA18,3591,072−7%

32Carroll County, IAIA20,3031,065−3%

33Madison County, IAIA17,2701,013−14%

34Union County, IAIA11,8291,001−31%

35Delaware County, IAIA17,674989−13%

36Boone County, IAIA26,799975−34%

37Clayton County, IAIA16,845969+5%

38Poweshiek County, IAIA18,368944−4%

39Clay County, IAIA16,202936+16%

40Jones County, IAIA21,253913−22%

41Jackson County, IAIA19,288893−34%

42Harrison County, IAIA14,623852+2%

43Mitchell County, IAIA10,650850+10%

44Plymouth County, IAIA25,697847−43%

45Allamakee County, IAIA14,238836+2%

46Iowa County, IAIA16,504827+11%

47Davis County, IAIA9,230790−33%

48Appanoose County, IAIA12,077769−22%

49Lucas County, IAIA8,847755−2%

50Butler County, IAIA14,049728−29%

51Hardin County, IAIA16,455709−6%

52Wayne County, IAIA6,738681+7%

53Crawford County, IAIA16,237673+16%

54Winneshiek County, IAIA19,733641−10%

55Page County, IAIA14,856636−67%

56Cass County, IAIA12,960635−13%

57Mills County, IAIA14,793634−41%

58Dickinson County, IAIA18,077625+51%

59Keokuk County, IAIA9,797621−37%

60Grundy County, IAIA12,361616−30%

61Tama County, IAIA16,796605−51%

62Kossuth County, IAIA14,322583−19%

63O'Brien County, IAIA14,220563−45%

64Monroe County, IAIA7,406538−23%

65Louisa County, IAIA10,416537−45%

66Decatur County, IAIA7,655532−32%

67Floyd County, IAIA14,901529−51%

68Palo Alto County, IAIA8,899529−11%

69Guthrie County, IAIA10,782524−49%

70Montgomery County, IAIA10,002511−54%

71Shelby County, IAIA11,689510−20%

72Calhoun County, IAIA9,562506−1%

73Winnebago County, IAIA10,251488+57%

74Greene County, IAIA8,658470−11%

75Van Buren County, IAIA7,131465−44%

76Fremont County, IAIA6,522460−60%

77Buena Vista County, IAIA20,449460−34%

78Hamilton County, IAIA14,944457−40%

79Chickasaw County, IAIA11,663448−59%

80Sac County, IAIA9,525437−28%

81Taylor County, IAIA5,835433−41%

82Cherokee County, IAIA11,369429−31%

83Hancock County, IAIA10,528410−17%

84Osceola County, IAIA5,980402+42%

85Howard County, IAIA9,415401+23%

86Ringgold County, IAIA4,642385−34%

87Lyon County, IAIA12,354379−34%

88Monona County, IAIA8,539371−21%

89Humboldt County, IAIA9,409367−37%

90Adair County, IAIA7,403356−28%

91Franklin County, IAIA9,868352−41%

92Wright County, IAIA12,801335−55%

93Ida County, IAIA6,777333−1%

94Clarke County, IAIA9,574297−49%

95Pocahontas County, IAIA6,819283−42%

96Emmet County, IAIA9,107280−14%

97Audubon County, IAIA5,509277−20%

98Adams County, IAIA3,617205+0%

99Worth County, IAIA7,338186−28%

SHOWING 1–99 OF 99

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