RANKING · 2024 ACS · 99 SHOWN OF 99

Largest Scotch-Irish population, Iowa counties

Iowa counties ranked by the number of residents who are Scotch-Irish ancestry, from the 2024 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. The median across all 99 is 79. Biggest climber in the top 100 since 2020: Allamakee County, IA, up 41 places to #38.

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IowaAll states All rankings

SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPSCOTCH-IRISH POPULATIONVS 2010

01Polk County, IAIA516,5463,882−42%

02Linn County, IAIA232,0281,931−44%

03▲2Scott County, IAIA175,2591,383−41%

04▼1Johnson County, IAIA160,0441,151−46%

05▼1Black Hawk County, IAIA131,532706−63%

06Story County, IAIA101,291622−51%

07Woodbury County, IAIA106,649528−58%

08▲21Webster County, IAIA36,838509−17%

09▼1Pottawattamie County, IAIA92,996489−72%

10Warren County, IAIA57,331458−46%

11▲7Muscatine County, IAIA41,853417−35%

12▼3Dallas County, IAIA118,457411−59%

13▲6Clinton County, IAIA46,002311−40%

14▲12Jasper County, IAIA38,153304−65%

15▲36Cerro Gordo County, IAIA42,372284−51%

16Dubuque County, IAIA99,381252−58%

17▼5Des Moines County, IAIA38,077246−70%

18▼4Marshall County, IAIA39,890234−73%

19▲2Bremer County, IAIA25,296214−6%

20▲13Iowa County, IAIA16,504211−8%

21▼1Lee County, IAIA32,306203−64%

22▲14Mahaska County, IAIA21,880201−56%

23▼10Wapello County, IAIA35,210198−63%

24▼1Benton County, IAIA26,004191−53%

25▲28Madison County, IAIA17,270191−45%

26▲37Monroe County, IAIA7,406180+46%

27▼5Poweshiek County, IAIA18,368168−66%

28▼17Boone County, IAIA26,799165−63%

29▼2Sioux County, IAIA36,774146−61%

30▼6Union County, IAIA11,829143−50%

31▲11Montgomery County, IAIA10,002142−22%

32▼17Henry County, IAIA19,349132−71%

33▼16Washington County, IAIA22,667127−74%

34▲24Van Buren County, IAIA7,131126−45%

35▼5Hamilton County, IAIA14,944124−64%

36▼2Marion County, IAIA34,192120−81%

37Mills County, IAIA14,793118−64%

38▲41Allamakee County, IAIA14,238113+18%

39▲13Buchanan County, IAIA20,883112−55%

40▼5Harrison County, IAIA14,623108−50%

41▲19Page County, IAIA14,856103−67%

42▲4Greene County, IAIA8,65898−49%

43▼5Grundy County, IAIA12,36197−50%

44▲20Appanoose County, IAIA12,07790−69%

45▲35Lucas County, IAIA8,84790−69%

46▲19Hardin County, IAIA16,45586−61%

47▼4Floyd County, IAIA14,90184−60%

48▲28Cedar County, IAIA18,35983−61%

49▼10Plymouth County, IAIA25,69783−74%

50▼6Keokuk County, IAIA9,79779−57%

51▼23Winneshiek County, IAIA19,73379−54%

52▼4Fayette County, IAIA19,04776−35%

53▲30Fremont County, IAIA6,52275−59%

54▲13Jackson County, IAIA19,28871−56%

55▼5Decatur County, IAIA7,65567−59%

56▼25Butler County, IAIA14,04967−57%

57Palo Alto County, IAIA8,89967+12%

58▼17Cass County, IAIA12,96066−78%

59▲26Buena Vista County, IAIA20,44965−68%

60▼11Clay County, IAIA16,20265−70%

61▼2Clayton County, IAIA16,84565−51%

62▼37Dickinson County, IAIA18,07765−66%

63▼31Jefferson County, IAIA15,29165−87%

64▲24Shelby County, IAIA11,68963−62%

65▼11Louisa County, IAIA10,41661−81%

66▲18Pocahontas County, IAIA6,81961−5%

67▲10Calhoun County, IAIA9,56258−52%

68▲1Chickasaw County, IAIA11,66357−36%

69▼24Hancock County, IAIA10,52857−32%

70▲11Sac County, IAIA9,52557−75%

71▼31Tama County, IAIA16,79657−79%

72▼16Guthrie County, IAIA10,78256−78%

73▼18Kossuth County, IAIA14,32255−68%

74▼27Wayne County, IAIA6,73855−80%

75▼14Franklin County, IAIA9,86854−59%

76▼6Wright County, IAIA12,80153−80%

77▲18Winnebago County, IAIA10,25149−42%

78▼16Mitchell County, IAIA10,65044−62%

79▼7Clarke County, IAIA9,57442−49%

80▲18Ida County, IAIA6,77742+56%

81▲16Delaware County, IAIA17,67440−47%

82▼16Jones County, IAIA21,25339−93%

83▲4Taylor County, IAIA5,83538−74%

84▲7Monona County, IAIA8,53936−65%

85▲9Crawford County, IAIA16,23729−74%

86▲7Worth County, IAIA7,33828−35%

87▼14Howard County, IAIA9,41526−68%

88▼2Osceola County, IAIA5,98025−51%

89▼18Ringgold County, IAIA4,64225−77%

90▼8Carroll County, IAIA20,30323−90%

91▼1Cherokee County, IAIA11,36923−91%

92▼17Audubon County, IAIA5,50922−70%

93▼15Adair County, IAIA7,40320−82%

94▼2Humboldt County, IAIA9,40919−84%

95▼6Emmet County, IAIA9,10718−84%

96▲3O'Brien County, IAIA14,22018−73%

97▼1Adams County, IAIA3,61716−76%

98▼30Lyon County, IAIA12,3549−78%

99▼25Davis County, IAIA9,2307−90%

SHOWING 1–99 OF 99

Download CSV (full list, 99 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES