RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest Scotch-Irish population, Iowa counties · 2020

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, IAIA516,5464,388–

02Linn County, IAIA232,0281,806–

03Johnson County, IAIA160,0441,395–

04Black Hawk County, IAIA131,5321,144–

05Scott County, IAIA175,2591,022–

06Story County, IAIA101,291795–

07Woodbury County, IAIA106,649673–

08Pottawattamie County, IAIA92,996672–

09Dallas County, IAIA118,457644–

10Warren County, IAIA57,331439–

11Boone County, IAIA26,799430–

12Des Moines County, IAIA38,077411–

13Wapello County, IAIA35,210375–

14Marshall County, IAIA39,890372–

15Henry County, IAIA19,349329–

16Dubuque County, IAIA99,381312–

17Washington County, IAIA22,667257–

18Muscatine County, IAIA41,853247–

19Clinton County, IAIA46,002238–

20Lee County, IAIA32,306220–

21Bremer County, IAIA25,296211–

22Poweshiek County, IAIA18,368209–

23Benton County, IAIA26,004202–

24Union County, IAIA11,829187–

25Dickinson County, IAIA18,077184–

26Jasper County, IAIA38,153184–

27Sioux County, IAIA36,774184–

28Winneshiek County, IAIA19,733176–

29Webster County, IAIA36,838170–

30Hamilton County, IAIA14,944169–

31Butler County, IAIA14,049165–

32Jefferson County, IAIA15,291159–

33Iowa County, IAIA16,504153–

34Marion County, IAIA34,192151–

35Harrison County, IAIA14,623149–

36Mahaska County, IAIA21,880145–

37Mills County, IAIA14,793142–

38Grundy County, IAIA12,361138–

39Plymouth County, IAIA25,697130–

40Tama County, IAIA16,796127–

41Cass County, IAIA12,960125–

42Montgomery County, IAIA10,002125–

43Floyd County, IAIA14,901124–

44Keokuk County, IAIA9,797117–

45Hancock County, IAIA10,528116–

46Greene County, IAIA8,658115–

47Wayne County, IAIA6,738115–

48Fayette County, IAIA19,047113–

49Clay County, IAIA16,202111–

50Decatur County, IAIA7,655108–

51Cerro Gordo County, IAIA42,372108–

52Buchanan County, IAIA20,883106–

53Madison County, IAIA17,270105–

54Louisa County, IAIA10,416100–

55Kossuth County, IAIA14,32296–

56Guthrie County, IAIA10,78295–

57Palo Alto County, IAIA8,89993–

58Van Buren County, IAIA7,13191–

59Clayton County, IAIA16,84589–

60Page County, IAIA14,85689–

61Franklin County, IAIA9,86886–

62Mitchell County, IAIA10,65085–

63Monroe County, IAIA7,40685–

64Appanoose County, IAIA12,07782–

65Hardin County, IAIA16,45581–

66Jones County, IAIA21,25378–

67Jackson County, IAIA19,28874–

68Lyon County, IAIA12,35473–

69Chickasaw County, IAIA11,66372–

70Wright County, IAIA12,80170–

71Ringgold County, IAIA4,64269–

72Clarke County, IAIA9,57468–

73Howard County, IAIA9,41565–

74Davis County, IAIA9,23064–

75Audubon County, IAIA5,50963–

76Cedar County, IAIA18,35963–

77Calhoun County, IAIA9,56259–

78Adair County, IAIA7,40358–

79Allamakee County, IAIA14,23855–

80Lucas County, IAIA8,84755–

81Sac County, IAIA9,52552–

82Carroll County, IAIA20,30345–

83Fremont County, IAIA6,52245–

84Pocahontas County, IAIA6,81945–

85Buena Vista County, IAIA20,44943–

86Osceola County, IAIA5,98042–

87Taylor County, IAIA5,83541–

88Shelby County, IAIA11,68939–

89Emmet County, IAIA9,10738–

90Cherokee County, IAIA11,36936–

91Monona County, IAIA8,53933–

92Humboldt County, IAIA9,40931–

93Worth County, IAIA7,33826–

94Crawford County, IAIA16,23724–

95Winnebago County, IAIA10,25124–

96Adams County, IAIA3,61717–

97Delaware County, IAIA17,67415–

98Ida County, IAIA6,77715–

99O'Brien County, IAIA14,22010–

SHOWING 1–99 OF 99

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