RANKING · 2010 CENSUS · 99 SHOWN OF 99

Highest Scotch-Irish population share, Iowa counties · 2010

Iowa counties ranked by the share of all residents who are Scotch-Irish ancestry (2010 American Community Survey). A concentration measure: Scotch-Irish residents as a percentage of total population. This list covers the 99 counties in Iowa that qualify, ranked against each other statewide. The median across all 99 is 1.5%.

Scotch-Irish Americans: full group profile →

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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 SHAREVS –

01Wayne County, IAIA6,7384.2%–

02Lucas County, IAIA8,8473.2%–

03Jefferson County, IAIA15,2913.0%–

04Van Buren County, IAIA7,1313.0%–

05Louisa County, IAIA10,4162.8%–

06Jones County, IAIA21,2532.6%–

07Poweshiek County, IAIA18,3682.6%–

08Fremont County, IAIA6,5222.4%–

09Jasper County, IAIA38,1532.4%–

10Taylor County, IAIA5,8352.3%–

11Guthrie County, IAIA10,7822.3%–

12Washington County, IAIA22,6672.3%–

13Union County, IAIA11,8292.3%–

14Henry County, IAIA19,3492.2%–

15Madison County, IAIA17,2702.2%–

16Appanoose County, IAIA12,0772.2%–

17Mills County, IAIA14,7932.2%–

18Cherokee County, IAIA11,3692.2%–

19Sac County, IAIA9,5252.2%–

20Hamilton County, IAIA14,9442.2%–

21Marshall County, IAIA39,8902.1%–

22Ringgold County, IAIA4,6422.1%–

23Cass County, IAIA12,9602.1%–

24Greene County, IAIA8,6582.1%–

25Des Moines County, IAIA38,0772.0%–

26Mahaska County, IAIA21,8802.0%–

27Wright County, IAIA12,8012.0%–

28Page County, IAIA14,8561.9%–

29Pottawattamie County, IAIA92,9961.9%–

30Decatur County, IAIA7,6551.9%–

31Marion County, IAIA34,1921.9%–

32Warren County, IAIA57,3311.9%–

33Keokuk County, IAIA9,7971.7%–

34Johnson County, IAIA160,0441.7%–

35Boone County, IAIA26,7991.7%–

36Montgomery County, IAIA10,0021.7%–

37Linn County, IAIA232,0281.7%–

38Dallas County, IAIA118,4571.6%–

39Adams County, IAIA3,6171.6%–

40Webster County, IAIA36,8381.6%–

41Polk County, IAIA516,5461.6%–

42Lee County, IAIA32,3061.6%–

43Grundy County, IAIA12,3611.6%–

44Monroe County, IAIA7,4061.6%–

45Benton County, IAIA26,0041.5%–

46Tama County, IAIA16,7961.5%–

47Wapello County, IAIA35,2101.5%–

48Muscatine County, IAIA41,8531.5%–

49Black Hawk County, IAIA131,5321.5%–

50Adair County, IAIA7,4031.5%–

51Story County, IAIA101,2911.4%–

52Scott County, IAIA175,2591.4%–

53Harrison County, IAIA14,6231.4%–

54Iowa County, IAIA16,5041.4%–

55Shelby County, IAIA11,6891.4%–

56Cerro Gordo County, IAIA42,3721.3%–

57Clay County, IAIA16,2021.3%–

58Floyd County, IAIA14,9011.3%–

59Plymouth County, IAIA25,6971.3%–

60Hardin County, IAIA16,4551.3%–

61Woodbury County, IAIA106,6491.2%–

62Franklin County, IAIA9,8681.2%–

63Calhoun County, IAIA9,5621.2%–

64Humboldt County, IAIA9,4091.2%–

65Audubon County, IAIA5,5091.2%–

66Buchanan County, IAIA20,8831.2%–

67Cedar County, IAIA18,3591.2%–

68Dickinson County, IAIA18,0771.1%–

69Sioux County, IAIA36,7741.1%–

70Emmet County, IAIA9,1071.1%–

71Monona County, IAIA8,5391.1%–

72Kossuth County, IAIA14,3221.1%–

73Carroll County, IAIA20,3031.1%–

74Mitchell County, IAIA10,6501.1%–

75Clinton County, IAIA46,0021.1%–

76Butler County, IAIA14,0491.0%–

77Buena Vista County, IAIA20,4491.0%–

78Bremer County, IAIA25,2960.9%–

79Clarke County, IAIA9,5740.9%–

80Pocahontas County, IAIA6,8190.9%–

81Howard County, IAIA9,4150.8%–

82Winneshiek County, IAIA19,7330.8%–

83Jackson County, IAIA19,2880.8%–

84Osceola County, IAIA5,9800.8%–

85Winnebago County, IAIA10,2510.8%–

86Davis County, IAIA9,2300.8%–

87Hancock County, IAIA10,5280.7%–

88Clayton County, IAIA16,8450.7%–

89Chickasaw County, IAIA11,6630.7%–

90Allamakee County, IAIA14,2380.7%–

91Crawford County, IAIA16,2370.6%–

92Dubuque County, IAIA99,3810.6%–

93Palo Alto County, IAIA8,8990.6%–

94Worth County, IAIA7,3380.6%–

95Fayette County, IAIA19,0470.6%–

96O'Brien County, IAIA14,2200.5%–

97Delaware County, IAIA17,6740.4%–

98Ida County, IAIA6,7770.4%–

99Lyon County, IAIA12,3540.3%–

SHOWING 1–99 OF 99

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS