RANKING · 2020 CENSUS · 99 SHOWN OF 99

Largest Scotch-Irish population, Iowa counties · 2020

Iowa counties ranked by the number of residents who are Scotch-Irish ancestry, from the 2020 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.

Scotch-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

RANKPLACESTATEPOPSCOTCH-IRISH POPULATIONVS 2010

01Polk County, IAIA516,5464,388−34%

02Linn County, IAIA232,0281,806−48%

03Johnson County, IAIA160,0441,395−35%

04Black Hawk County, IAIA131,5321,144−41%

05Scott County, IAIA175,2591,022−56%

06Story County, IAIA101,291795−37%

07Woodbury County, IAIA106,649673−47%

08Pottawattamie County, IAIA92,996672−62%

09Dallas County, IAIA118,457644−35%

10Warren County, IAIA57,331439−48%

11Boone County, IAIA26,799430−3%

12Des Moines County, IAIA38,077411−50%

13Wapello County, IAIA35,210375−31%

14Marshall County, IAIA39,890372−57%

15Henry County, IAIA19,349329−28%

16Dubuque County, IAIA99,381312−48%

17Washington County, IAIA22,667257−48%

18Muscatine County, IAIA41,853247−62%

19Clinton County, IAIA46,002238−54%

20Lee County, IAIA32,306220−61%

21Bremer County, IAIA25,296211−7%

22Poweshiek County, IAIA18,368209−57%

23Benton County, IAIA26,004202−50%

24Union County, IAIA11,829187−34%

25Dickinson County, IAIA18,077184−4%

26Sioux County, IAIA36,774184−50%

27Jasper County, IAIA38,153184−79%

28Winneshiek County, IAIA19,733176+2%

29Webster County, IAIA36,838170−72%

30Hamilton County, IAIA14,944169−51%

31Butler County, IAIA14,049165+6%

32Jefferson County, IAIA15,291159−69%

33Iowa County, IAIA16,504153−33%

34Marion County, IAIA34,192151−76%

35Harrison County, IAIA14,623149−31%

36Mahaska County, IAIA21,880145−68%

37Mills County, IAIA14,793142−57%

38Grundy County, IAIA12,361138−28%

39Plymouth County, IAIA25,697130−59%

40Tama County, IAIA16,796127−54%

41Cass County, IAIA12,960125−58%

42Montgomery County, IAIA10,002125−32%

43Floyd County, IAIA14,901124−42%

44Keokuk County, IAIA9,797117−36%

45Hancock County, IAIA10,528116+38%

46Greene County, IAIA8,658115−41%

47Wayne County, IAIA6,738115−57%

48Fayette County, IAIA19,047113−3%

49Clay County, IAIA16,202111−49%

50Decatur County, IAIA7,655108−34%

51Cerro Gordo County, IAIA42,372108−81%

52Buchanan County, IAIA20,883106−58%

53Madison County, IAIA17,270105−70%

54Louisa County, IAIA10,416100−70%

55Kossuth County, IAIA14,32296−44%

56Guthrie County, IAIA10,78295−63%

57Palo Alto County, IAIA8,89993+55%

58Van Buren County, IAIA7,13191−60%

59Page County, IAIA14,85689−71%

60Clayton County, IAIA16,84589−33%

61Franklin County, IAIA9,86886−35%

62Monroe County, IAIA7,40685−31%

63Mitchell County, IAIA10,65085−26%

64Appanoose County, IAIA12,07782−71%

65Hardin County, IAIA16,45581−64%

66Jones County, IAIA21,25378−86%

67Jackson County, IAIA19,28874−54%

68Lyon County, IAIA12,35473+83%

69Chickasaw County, IAIA11,66372−19%

70Wright County, IAIA12,80170−73%

71Ringgold County, IAIA4,64269−37%

72Clarke County, IAIA9,57468−18%

73Howard County, IAIA9,41565−19%

74Davis County, IAIA9,23064−4%

75Audubon County, IAIA5,50963−15%

76Cedar County, IAIA18,35963−70%

77Calhoun County, IAIA9,56259−51%

78Adair County, IAIA7,40358−49%

79Allamakee County, IAIA14,23855−43%

80Lucas County, IAIA8,84755−81%

81Sac County, IAIA9,52552−77%

82Fremont County, IAIA6,52245−75%

83Pocahontas County, IAIA6,81945−30%

84Carroll County, IAIA20,30345−80%

85Buena Vista County, IAIA20,44943−79%

86Osceola County, IAIA5,98042−18%

87Taylor County, IAIA5,83541−72%

88Shelby County, IAIA11,68939−77%

89Emmet County, IAIA9,10738−67%

90Cherokee County, IAIA11,36936−86%

91Monona County, IAIA8,53933−68%

92Humboldt County, IAIA9,40931−74%

93Worth County, IAIA7,33826−40%

94Crawford County, IAIA16,23724−78%

95Winnebago County, IAIA10,25124−72%

96Adams County, IAIA3,61717−74%

97Ida County, IAIA6,77715−44%

98Delaware County, IAIA17,67415−80%

99O'Brien County, IAIA14,22010−85%

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS