RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest Irish population, Iowa counties · 2020

Iowa counties ranked by the number of residents who are Irish ancestry, from the 2023 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. 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 POPULATIONVS 2000

01Polk County, IAIA516,54662,597–

02Linn County, IAIA232,02832,411–

03Scott County, IAIA175,25927,100–

04Johnson County, IAIA160,04419,942–

05Dubuque County, IAIA99,38119,650–

06Black Hawk County, IAIA131,53215,801–

07Pottawattamie County, IAIA92,99612,909–

08Woodbury County, IAIA106,64912,290–

09Dallas County, IAIA118,45712,177–

10Story County, IAIA101,29111,708–

11Clinton County, IAIA46,0028,031–

12Warren County, IAIA57,3316,819–

13Jasper County, IAIA38,1535,388–

14Cerro Gordo County, IAIA42,3725,318–

15Des Moines County, IAIA38,0774,959–

16Lee County, IAIA32,3064,867–

17Webster County, IAIA36,8384,385–

18Marion County, IAIA34,1924,376–

19Muscatine County, IAIA41,8533,991–

20Wapello County, IAIA35,2103,959–

21Benton County, IAIA26,0043,609–

22Boone County, IAIA26,7993,570–

23Jones County, IAIA21,2533,520–

24Buchanan County, IAIA20,8833,181–

25Marshall County, IAIA39,8903,153–

26Poweshiek County, IAIA18,3683,077–

27Washington County, IAIA22,6673,037–

28Jackson County, IAIA19,2882,946–

29Mahaska County, IAIA21,8802,833–

30Fayette County, IAIA19,0472,811–

31Bremer County, IAIA25,2962,806–

32Plymouth County, IAIA25,6972,702–

33Delaware County, IAIA17,6742,701–

34Cedar County, IAIA18,3592,598–

35Carroll County, IAIA20,3032,453–

36Winneshiek County, IAIA19,7332,420–

37Madison County, IAIA17,2702,408–

38Allamakee County, IAIA14,2382,393–

39Iowa County, IAIA16,5042,316–

40Floyd County, IAIA14,9012,205–

41Harrison County, IAIA14,6232,160–

42Mills County, IAIA14,7932,136–

43Clayton County, IAIA16,8452,096–

44Page County, IAIA14,8562,069–

45Jefferson County, IAIA15,2912,009–

46Henry County, IAIA19,3491,965–

47Dickinson County, IAIA18,0771,918–

48Buena Vista County, IAIA20,4491,909–

49Cass County, IAIA12,9601,831–

50Hardin County, IAIA16,4551,771–

51Tama County, IAIA16,7961,769–

52Sioux County, IAIA36,7741,721–

53Appanoose County, IAIA12,0771,692–

54Clay County, IAIA16,2021,664–

55Palo Alto County, IAIA8,8991,649–

56Shelby County, IAIA11,6891,548–

57Keokuk County, IAIA9,7971,477–

58Chickasaw County, IAIA11,6631,471–

59Monroe County, IAIA7,4061,469–

60Kossuth County, IAIA14,3221,451–

61Hamilton County, IAIA14,9441,446–

62Guthrie County, IAIA10,7821,371–

63Crawford County, IAIA16,2371,342–

64Monona County, IAIA8,5391,332–

65Butler County, IAIA14,0491,297–

66Greene County, IAIA8,6581,281–

67Wright County, IAIA12,8011,209–

68Mitchell County, IAIA10,6501,203–

69Humboldt County, IAIA9,4091,180–

70Calhoun County, IAIA9,5621,167–

71Louisa County, IAIA10,4161,167–

72Pocahontas County, IAIA6,8191,162–

73Montgomery County, IAIA10,0021,131–

74Lucas County, IAIA8,8471,113–

75Union County, IAIA11,8291,086–

76Adair County, IAIA7,4031,066–

77Howard County, IAIA9,4151,041–

78Grundy County, IAIA12,3611,018–

79Cherokee County, IAIA11,3691,012–

80Davis County, IAIA9,2301,009–

81Hancock County, IAIA10,528980–

82Sac County, IAIA9,525946–

83Clarke County, IAIA9,574941–

84Van Buren County, IAIA7,131929–

85Fremont County, IAIA6,522879–

86Emmet County, IAIA9,107874–

87Decatur County, IAIA7,655848–

88Lyon County, IAIA12,354842–

89O'Brien County, IAIA14,220763–

90Franklin County, IAIA9,868746–

91Worth County, IAIA7,338710–

92Wayne County, IAIA6,738701–

93Ringgold County, IAIA4,642682–

94Taylor County, IAIA5,835618–

95Winnebago County, IAIA10,251604–

96Ida County, IAIA6,777599–

97Adams County, IAIA3,617574–

98Osceola County, IAIA5,980535–

99Audubon County, IAIA5,509419–

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

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