RANKING · 2010 CENSUS · 67 SHOWN OF 67

Largest Scotch-Irish population, Pennsylvania counties · 2010

Pennsylvania counties ranked by the number of residents who are Scotch-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 67 counties in Pennsylvania that qualify, ranked against each other statewide.

PennsylvaniaAll 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

RANKPLACESTATEPOPSCOTCH-IRISH POPULATIONVS 2000

01Allegheny County, PAPA1,225,03530,257–

02Montgomery County, PAPA877,64314,136–

03Chester County, PAPA557,11612,559–

04Bucks County, PAPA647,82811,692–

05Westmoreland County, PAPA349,32411,476–

06Washington County, PAPA210,80211,333–

07Delaware County, PAPA580,9379,926–

08Lancaster County, PAPA563,1599,923–

09Philadelphia County, PAPA1,574,2819,813–

10York County, PAPA473,1978,820–

11Butler County, PAPA200,1698,629–

12Erie County, PAPA265,8326,961–

13Beaver County, PAPA166,0326,654–

14Cumberland County, PAPA277,2706,611–

15Dauphin County, PAPA293,3515,353–

16Lawrence County, PAPA83,9115,256–

17Mercer County, PAPA107,8605,091–

18Berks County, PAPA440,0724,456–

19Franklin County, PAPA160,6524,214–

20Indiana County, PAPA82,8783,673–

21Lehigh County, PAPA384,3833,516–

22Northampton County, PAPA324,4113,388–

23Crawford County, PAPA81,7923,325–

24Blair County, PAPA119,5413,208–

25Centre County, PAPA157,3933,115–

26Fayette County, PAPA123,0212,709–

27Cambria County, PAPA128,9682,508–

28Armstrong County, PAPA63,6982,483–

29Luzerne County, PAPA332,1262,447–

30Venango County, PAPA49,3462,422–

31Monroe County, PAPA167,1792,055–

32Lebanon County, PAPA146,3801,986–

33Lackawanna County, PAPA216,5021,944–

34Adams County, PAPA107,5941,937–

35Greene County, PAPA33,8851,906–

36Lycoming County, PAPA112,5871,710–

37Clearfield County, PAPA78,1001,581–

38Clarion County, PAPA36,6801,380–

39Jefferson County, PAPA43,2551,348–

40Huntingdon County, PAPA43,0011,289–

41Mifflin County, PAPA46,1271,285–

42Warren County, PAPA37,0381,261–

43Somerset County, PAPA72,0041,248–

44Perry County, PAPA46,8061,120–

45Bradford County, PAPA59,6001,078–

46Northumberland County, PAPA89,920986–

47Bedford County, PAPA47,480918–

48McKean County, PAPA38,984844–

49Tioga County, PAPA40,502844–

50Susquehanna County, PAPA38,237791–

51Clinton County, PAPA37,870755–

52Schuylkill County, PAPA145,085690–

53Columbia County, PAPA66,193660–

54Wayne County, PAPA51,703632–

55Pike County, PAPA62,808596–

56Union County, PAPA42,313594–

57Juniata County, PAPA23,403590–

58Carbon County, PAPA65,868569–

59Elk County, PAPA29,926505–

60Wyoming County, PAPA25,790370–

61Snyder County, PAPA39,655345–

62Potter County, PAPA15,897298–

63Fulton County, PAPA14,483267–

64Montour County, PAPA17,868229–

65Forest County, PAPA6,614225–

66Sullivan County, PAPA5,856148–

67Cameron County, PAPA4,211120–

SHOWING 1–67 OF 67

Download CSV (full list, 67 rows)

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