RANKING · 2020 CENSUS · 99 SHOWN OF 99

Highest Irish population share, Iowa counties · 2020

Iowa counties ranked by the share of all residents who are Irish ancestry (2023 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.

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

RANKPLACESTATEPOPIRISH SHAREVS 2000

01Dubuque County, IAIA99,38120.2%–

02Monroe County, IAIA7,40618.9%–

03Palo Alto County, IAIA8,89918.4%–

04Allamakee County, IAIA14,23817.4%–

05Pocahontas County, IAIA6,81917.3%–

06Clinton County, IAIA46,00217.2%–

07Jones County, IAIA21,25317.1%–

08Poweshiek County, IAIA18,36816.7%–

09Adams County, IAIA3,61715.8%–

10Delaware County, IAIA17,67415.8%–

11Scott County, IAIA175,25915.7%–

12Harrison County, IAIA14,62315.4%–

13Monona County, IAIA8,53915.4%–

14Jackson County, IAIA19,28815.2%–

15Adair County, IAIA7,40315.1%–

16Buchanan County, IAIA20,88315.0%–

17Madison County, IAIA17,27014.9%–

18Jasper County, IAIA38,15314.5%–

19Keokuk County, IAIA9,79714.5%–

20Linn County, IAIA232,02814.4%–

21Greene County, IAIA8,65814.4%–

22Fayette County, IAIA19,04714.3%–

23Lee County, IAIA32,30614.3%–

24Iowa County, IAIA16,50414.3%–

25Mills County, IAIA14,79314.2%–

26Benton County, IAIA26,00414.1%–

27Cass County, IAIA12,96014.1%–

28Cedar County, IAIA18,35914.1%–

29Floyd County, IAIA14,90114.0%–

30Ringgold County, IAIA4,64213.9%–

31Pottawattamie County, IAIA92,99613.8%–

32Washington County, IAIA22,66713.7%–

33Page County, IAIA14,85613.6%–

34Appanoose County, IAIA12,07713.6%–

35Boone County, IAIA26,79913.5%–

36Dallas County, IAIA118,45713.5%–

37Shelby County, IAIA11,68913.4%–

38Warren County, IAIA57,33113.4%–

39Johnson County, IAIA160,04413.2%–

40Marion County, IAIA34,19213.2%–

41Van Buren County, IAIA7,13113.1%–

42Lucas County, IAIA8,84713.0%–

43Polk County, IAIA516,54612.9%–

44Guthrie County, IAIA10,78212.8%–

45Fremont County, IAIA6,52212.7%–

46Mahaska County, IAIA21,88012.7%–

47Des Moines County, IAIA38,07712.6%–

48Cerro Gordo County, IAIA42,37212.5%–

49Humboldt County, IAIA9,40912.4%–

50Chickasaw County, IAIA11,66312.3%–

51Carroll County, IAIA20,30312.2%–

52Calhoun County, IAIA9,56212.1%–

53Webster County, IAIA36,83812.1%–

54Winneshiek County, IAIA19,73312.0%–

55Story County, IAIA101,29112.0%–

56Black Hawk County, IAIA131,53212.0%–

57Woodbury County, IAIA106,64912.0%–

58Clayton County, IAIA16,84512.0%–

59Mitchell County, IAIA10,65011.4%–

60Howard County, IAIA9,41511.3%–

61Montgomery County, IAIA10,00211.3%–

62Wapello County, IAIA35,21011.3%–

63Davis County, IAIA9,23011.2%–

64Bremer County, IAIA25,29611.2%–

65Dickinson County, IAIA18,07711.1%–

66Jefferson County, IAIA15,29111.1%–

67Wayne County, IAIA6,73810.9%–

68Plymouth County, IAIA25,69710.7%–

69Decatur County, IAIA7,65510.7%–

70Louisa County, IAIA10,41610.5%–

71Hardin County, IAIA16,45510.5%–

72Tama County, IAIA16,79610.4%–

73Clay County, IAIA16,20210.3%–

74Taylor County, IAIA5,83510.0%–

75Clarke County, IAIA9,57410.0%–

76Henry County, IAIA19,3499.9%–

77Kossuth County, IAIA14,3229.8%–

78Sac County, IAIA9,5259.7%–

79Hamilton County, IAIA14,9449.7%–

80Buena Vista County, IAIA20,4499.6%–

81Worth County, IAIA7,3389.6%–

82Wright County, IAIA12,8019.6%–

83Emmet County, IAIA9,1079.4%–

84Muscatine County, IAIA41,8539.3%–

85Hancock County, IAIA10,5289.2%–

86Cherokee County, IAIA11,3699.0%–

87Butler County, IAIA14,0498.9%–

88Osceola County, IAIA5,9808.9%–

89Union County, IAIA11,8298.8%–

90Ida County, IAIA6,7778.7%–

91Grundy County, IAIA12,3618.3%–

92Marshall County, IAIA39,8907.9%–

93Crawford County, IAIA16,2377.9%–

94Audubon County, IAIA5,5097.6%–

95Franklin County, IAIA9,8687.4%–

96Lyon County, IAIA12,3547.1%–

97Winnebago County, IAIA10,2515.8%–

98O'Brien County, IAIA14,2205.5%–

99Sioux County, IAIA36,7744.9%–

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

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