RANKING · 2024 ACS · 99 SHOWN OF 99

Largest Scotch-Irish population, Iowa counties

Iowa counties ranked by the number of residents who are Scotch-Irish ancestry, from the 2023 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.

IowaAll states All rankings

SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPSCOTCH-IRISH POPULATIONVS 2000

01Polk County, IAIA516,5463,882–

02Linn County, IAIA232,0281,931–

03Scott County, IAIA175,2591,383–

04Johnson County, IAIA160,0441,151–

05Black Hawk County, IAIA131,532706–

06Story County, IAIA101,291622–

07Woodbury County, IAIA106,649528–

08Webster County, IAIA36,838509–

09Pottawattamie County, IAIA92,996489–

10Warren County, IAIA57,331458–

11Muscatine County, IAIA41,853417–

12Dallas County, IAIA118,457411–

13Clinton County, IAIA46,002311–

14Jasper County, IAIA38,153304–

15Cerro Gordo County, IAIA42,372284–

16Dubuque County, IAIA99,381252–

17Des Moines County, IAIA38,077246–

18Marshall County, IAIA39,890234–

19Bremer County, IAIA25,296214–

20Iowa County, IAIA16,504211–

21Lee County, IAIA32,306203–

22Mahaska County, IAIA21,880201–

23Wapello County, IAIA35,210198–

24Benton County, IAIA26,004191–

25Madison County, IAIA17,270191–

26Monroe County, IAIA7,406180–

27Poweshiek County, IAIA18,368168–

28Boone County, IAIA26,799165–

29Sioux County, IAIA36,774146–

30Union County, IAIA11,829143–

31Montgomery County, IAIA10,002142–

32Henry County, IAIA19,349132–

33Washington County, IAIA22,667127–

34Van Buren County, IAIA7,131126–

35Hamilton County, IAIA14,944124–

36Marion County, IAIA34,192120–

37Mills County, IAIA14,793118–

38Allamakee County, IAIA14,238113–

39Buchanan County, IAIA20,883112–

40Harrison County, IAIA14,623108–

41Page County, IAIA14,856103–

42Greene County, IAIA8,65898–

43Grundy County, IAIA12,36197–

44Appanoose County, IAIA12,07790–

45Lucas County, IAIA8,84790–

46Hardin County, IAIA16,45586–

47Floyd County, IAIA14,90184–

48Cedar County, IAIA18,35983–

49Plymouth County, IAIA25,69783–

50Keokuk County, IAIA9,79779–

51Winneshiek County, IAIA19,73379–

52Fayette County, IAIA19,04776–

53Fremont County, IAIA6,52275–

54Jackson County, IAIA19,28871–

55Decatur County, IAIA7,65567–

56Butler County, IAIA14,04967–

57Palo Alto County, IAIA8,89967–

58Cass County, IAIA12,96066–

59Buena Vista County, IAIA20,44965–

60Clay County, IAIA16,20265–

61Clayton County, IAIA16,84565–

62Dickinson County, IAIA18,07765–

63Jefferson County, IAIA15,29165–

64Shelby County, IAIA11,68963–

65Louisa County, IAIA10,41661–

66Pocahontas County, IAIA6,81961–

67Calhoun County, IAIA9,56258–

68Chickasaw County, IAIA11,66357–

69Hancock County, IAIA10,52857–

70Sac County, IAIA9,52557–

71Tama County, IAIA16,79657–

72Guthrie County, IAIA10,78256–

73Kossuth County, IAIA14,32255–

74Wayne County, IAIA6,73855–

75Franklin County, IAIA9,86854–

76Wright County, IAIA12,80153–

77Winnebago County, IAIA10,25149–

78Mitchell County, IAIA10,65044–

79Clarke County, IAIA9,57442–

80Ida County, IAIA6,77742–

81Delaware County, IAIA17,67440–

82Jones County, IAIA21,25339–

83Taylor County, IAIA5,83538–

84Monona County, IAIA8,53936–

85Crawford County, IAIA16,23729–

86Worth County, IAIA7,33828–

87Howard County, IAIA9,41526–

88Osceola County, IAIA5,98025–

89Ringgold County, IAIA4,64225–

90Carroll County, IAIA20,30323–

91Cherokee County, IAIA11,36923–

92Audubon County, IAIA5,50922–

93Adair County, IAIA7,40320–

94Humboldt County, IAIA9,40919–

95Emmet County, IAIA9,10718–

96O'Brien County, IAIA14,22018–

97Adams County, IAIA3,61716–

98Lyon County, IAIA12,3549–

99Davis County, IAIA9,2307–

SHOWING 1–99 OF 99

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