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 (2023 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.

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 SHAREVS 2000

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