RANKING · 2010 CENSUS · 99 SHOWN OF 99

Highest Irish population share, Iowa counties · 2010

Iowa counties ranked by the share of all residents who are Irish ancestry (2010 American Community Survey). A concentration measure: 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 14.2%.

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

RANKPLACESTATEPOPIRISH SHAREVS –

01Dubuque County, IAIA99,38123.3%–

02Monroe County, IAIA7,40620.7%–

03Madison County, IAIA17,27019.8%–

04Buchanan County, IAIA20,88319.4%–

05Harrison County, IAIA14,62319.3%–

06Allamakee County, IAIA14,23818.7%–

07Jones County, IAIA21,25318.3%–

08Linn County, IAIA232,02818.2%–

09Pottawattamie County, IAIA92,99618.2%–

10Palo Alto County, IAIA8,89918.1%–

11Clinton County, IAIA46,00218.0%–

12Iowa County, IAIA16,50417.9%–

13Johnson County, IAIA160,04417.6%–

14Wapello County, IAIA35,21017.5%–

15Delaware County, IAIA17,67417.4%–

16Ringgold County, IAIA4,64217.3%–

17Monona County, IAIA8,53917.3%–

18Webster County, IAIA36,83817.2%–

19Keokuk County, IAIA9,79717.2%–

20Page County, IAIA14,85616.7%–

21Benton County, IAIA26,00416.7%–

22Des Moines County, IAIA38,07716.7%–

23Lucas County, IAIA8,84716.6%–

24Union County, IAIA11,82916.5%–

25Greene County, IAIA8,65816.5%–

26Wright County, IAIA12,80116.4%–

27Scott County, IAIA175,25916.4%–

28Warren County, IAIA57,33116.3%–

29Jackson County, IAIA19,28816.2%–

30Lee County, IAIA32,30616.2%–

31Howard County, IAIA9,41516.1%–

32Henry County, IAIA19,34916.0%–

33Dallas County, IAIA118,45715.9%–

34Adams County, IAIA3,61715.9%–

35Taylor County, IAIA5,83515.9%–

36Poweshiek County, IAIA18,36815.8%–

37Woodbury County, IAIA106,64915.7%–

38Fremont County, IAIA6,52215.7%–

39Appanoose County, IAIA12,07715.7%–

40Mills County, IAIA14,79315.6%–

41Decatur County, IAIA7,65515.4%–

42Polk County, IAIA516,54615.3%–

43Washington County, IAIA22,66715.2%–

44Winneshiek County, IAIA19,73315.2%–

45Ida County, IAIA6,77715.2%–

46Grundy County, IAIA12,36115.1%–

47Kossuth County, IAIA14,32214.6%–

48Fayette County, IAIA19,04714.6%–

49Cherokee County, IAIA11,36914.3%–

50Jasper County, IAIA38,15314.2%–

51Mahaska County, IAIA21,88014.1%–

52Marion County, IAIA34,19214.1%–

53Cedar County, IAIA18,35914.0%–

54Black Hawk County, IAIA131,53213.9%–

55Wayne County, IAIA6,73813.9%–

56Cass County, IAIA12,96013.8%–

57Emmet County, IAIA9,10713.7%–

58Van Buren County, IAIA7,13113.7%–

59Calhoun County, IAIA9,56213.7%–

60Clarke County, IAIA9,57413.7%–

61Montgomery County, IAIA10,00213.6%–

62Marshall County, IAIA39,89013.4%–

63Hamilton County, IAIA14,94413.4%–

64Cerro Gordo County, IAIA42,37213.3%–

65Guthrie County, IAIA10,78213.3%–

66Muscatine County, IAIA41,85313.2%–

67Jefferson County, IAIA15,29113.1%–

68Clayton County, IAIA16,84513.1%–

69Boone County, IAIA26,79913.0%–

70Dickinson County, IAIA18,07712.9%–

71Clay County, IAIA16,20212.9%–

72Plymouth County, IAIA25,69712.8%–

73Story County, IAIA101,29112.7%–

74Pocahontas County, IAIA6,81912.6%–

75Chickasaw County, IAIA11,66312.6%–

76Adair County, IAIA7,40312.6%–

77Shelby County, IAIA11,68912.4%–

78Mitchell County, IAIA10,65012.3%–

79Worth County, IAIA7,33812.2%–

80Carroll County, IAIA20,30312.1%–

81Davis County, IAIA9,23012.1%–

82Louisa County, IAIA10,41612.0%–

83Bremer County, IAIA25,29611.8%–

84Sac County, IAIA9,52511.8%–

85Crawford County, IAIA16,23711.4%–

86Butler County, IAIA14,04911.4%–

87Tama County, IAIA16,79611.1%–

88Humboldt County, IAIA9,40911.1%–

89Hardin County, IAIA16,45511.0%–

90Buena Vista County, IAIA20,44910.6%–

91Floyd County, IAIA14,90110.5%–

92Audubon County, IAIA5,50910.4%–

93Franklin County, IAIA9,86810.2%–

94Hancock County, IAIA10,5289.1%–

95Winnebago County, IAIA10,2518.2%–

96Lyon County, IAIA12,3548.2%–

97Osceola County, IAIA5,9807.5%–

98O'Brien County, IAIA14,2207.2%–

99Sioux County, IAIA36,7746.6%–

SHOWING 1–99 OF 99

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