RANKING · 2020 CENSUS · 99 SHOWN OF 99

Highest Scotch-Irish population share, Iowa counties · 2020

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.

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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 2000

01Wayne County, IAIA6,7381.8%–

02Henry County, IAIA19,3491.7%–

03Boone County, IAIA26,7991.6%–

04Union County, IAIA11,8291.5%–

05Ringgold County, IAIA4,6421.4%–

06Decatur County, IAIA7,6551.4%–

07Greene County, IAIA8,6581.3%–

08Van Buren County, IAIA7,1311.3%–

09Montgomery County, IAIA10,0021.2%–

10Washington County, IAIA22,6671.2%–

11Keokuk County, IAIA9,7971.2%–

12Audubon County, IAIA5,5091.1%–

13Butler County, IAIA14,0491.1%–

14Poweshiek County, IAIA18,3681.1%–

15Hamilton County, IAIA14,9441.1%–

16Grundy County, IAIA12,3611.1%–

17Monroe County, IAIA7,4061.1%–

18Hancock County, IAIA10,5281.1%–

19Wapello County, IAIA35,2101.1%–

20Dickinson County, IAIA18,0771.1%–

21Harrison County, IAIA14,6231.1%–

22Des Moines County, IAIA38,0771.0%–

23Palo Alto County, IAIA8,8991.0%–

24Cass County, IAIA12,9601.0%–

25Iowa County, IAIA16,5040.9%–

26Mills County, IAIA14,7930.9%–

27Marshall County, IAIA39,8900.9%–

28Johnson County, IAIA160,0440.9%–

29Polk County, IAIA516,5460.9%–

30Louisa County, IAIA10,4160.9%–

31Guthrie County, IAIA10,7820.9%–

32Winneshiek County, IAIA19,7330.9%–

33Jefferson County, IAIA15,2910.9%–

34Black Hawk County, IAIA131,5320.9%–

35Warren County, IAIA57,3310.9%–

36Franklin County, IAIA9,8680.9%–

37Bremer County, IAIA25,2960.8%–

38Adair County, IAIA7,4030.8%–

39Story County, IAIA101,2910.8%–

40Mitchell County, IAIA10,6500.8%–

41Linn County, IAIA232,0280.8%–

42Benton County, IAIA26,0040.8%–

43Floyd County, IAIA14,9010.8%–

44Tama County, IAIA16,7960.7%–

45Clarke County, IAIA9,5740.7%–

46Pottawattamie County, IAIA92,9960.7%–

47Davis County, IAIA9,2300.7%–

48Dallas County, IAIA118,4570.7%–

49Howard County, IAIA9,4150.7%–

50Osceola County, IAIA5,9800.7%–

51Clay County, IAIA16,2020.7%–

52Pocahontas County, IAIA6,8190.7%–

53Taylor County, IAIA5,8350.7%–

54Appanoose County, IAIA12,0770.7%–

55Woodbury County, IAIA106,6490.7%–

56Fremont County, IAIA6,5220.7%–

57Madison County, IAIA17,2700.7%–

58Mahaska County, IAIA21,8800.6%–

59Lee County, IAIA32,3060.6%–

60Kossuth County, IAIA14,3220.6%–

61Lucas County, IAIA8,8470.6%–

62Lyon County, IAIA12,3540.6%–

63Calhoun County, IAIA9,5620.6%–

64Chickasaw County, IAIA11,6630.6%–

65Scott County, IAIA175,2590.6%–

66Page County, IAIA14,8560.6%–

67Muscatine County, IAIA41,8530.6%–

68Fayette County, IAIA19,0470.6%–

69Wright County, IAIA12,8010.6%–

70Sac County, IAIA9,5250.5%–

71Sioux County, IAIA36,7740.5%–

72Plymouth County, IAIA25,6970.5%–

73Clinton County, IAIA46,0020.5%–

74Clayton County, IAIA16,8450.5%–

75Buchanan County, IAIA20,8830.5%–

76Jasper County, IAIA38,1530.5%–

77Hardin County, IAIA16,4550.5%–

78Adams County, IAIA3,6170.5%–

79Webster County, IAIA36,8380.5%–

80Marion County, IAIA34,1920.5%–

81Emmet County, IAIA9,1070.4%–

82Allamakee County, IAIA14,2380.4%–

83Jackson County, IAIA19,2880.4%–

84Monona County, IAIA8,5390.4%–

85Jones County, IAIA21,2530.4%–

86Worth County, IAIA7,3380.4%–

87Cedar County, IAIA18,3590.3%–

88Shelby County, IAIA11,6890.3%–

89Humboldt County, IAIA9,4090.3%–

90Dubuque County, IAIA99,3810.3%–

91Cherokee County, IAIA11,3690.3%–

92Cerro Gordo County, IAIA42,3720.3%–

93Winnebago County, IAIA10,2510.2%–

94Carroll County, IAIA20,3030.2%–

95Ida County, IAIA6,7770.2%–

96Buena Vista County, IAIA20,4490.2%–

97Crawford County, IAIA16,2370.1%–

98Delaware County, IAIA17,6740.1%–

99O'Brien County, IAIA14,2200.1%–

SHOWING 1–99 OF 99

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