RANKING · 2020 CENSUS · 67 SHOWN OF 67

Largest Scotch-Irish population, Pennsylvania counties · 2020

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, PAPA1,225,03517,936–

02Washington County, PAPA210,8027,459–

03Westmoreland County, PAPA349,3246,983–

04Montgomery County, PAPA877,6436,234–

05Bucks County, PAPA647,8286,030–

06Chester County, PAPA557,1165,903–

07Lancaster County, PAPA563,1595,705–

08Butler County, PAPA200,1695,700–

09York County, PAPA473,1975,416–

10Delaware County, PAPA580,9374,370–

11Philadelphia County, PAPA1,574,2814,015–

12Beaver County, PAPA166,0323,921–

13Cumberland County, PAPA277,2703,785–

14Erie County, PAPA265,8323,675–

15Mercer County, PAPA107,8603,109–

16Franklin County, PAPA160,6522,910–

17Lawrence County, PAPA83,9112,908–

18Dauphin County, PAPA293,3512,674–

19Berks County, PAPA440,0722,286–

20Centre County, PAPA157,3932,211–

21Fayette County, PAPA123,0211,890–

22Indiana County, PAPA82,8781,776–

23Armstrong County, PAPA63,6981,769–

24Northampton County, PAPA324,4111,705–

25Blair County, PAPA119,5411,602–

26Crawford County, PAPA81,7921,582–

27Lehigh County, PAPA384,3831,438–

28Cambria County, PAPA128,9681,416–

29Adams County, PAPA107,5941,362–

30Lebanon County, PAPA146,3801,329–

31Venango County, PAPA49,3461,324–

32Monroe County, PAPA167,1791,254–

33Perry County, PAPA46,8061,248–

34Clearfield County, PAPA78,1001,222–

35Greene County, PAPA33,8851,037–

36Lycoming County, PAPA112,587983–

37Huntingdon County, PAPA43,001957–

38Luzerne County, PAPA332,126934–

39Mifflin County, PAPA46,127912–

40Clarion County, PAPA36,680784–

41Jefferson County, PAPA43,255774–

42Warren County, PAPA37,038726–

43Lackawanna County, PAPA216,502674–

44Tioga County, PAPA40,502670–

45McKean County, PAPA38,984665–

46Somerset County, PAPA72,004659–

47Bradford County, PAPA59,600521–

48Northumberland County, PAPA89,920515–

49Schuylkill County, PAPA145,085507–

50Union County, PAPA42,313459–

51Bedford County, PAPA47,480446–

52Pike County, PAPA62,808424–

53Columbia County, PAPA66,193423–

54Carbon County, PAPA65,868416–

55Clinton County, PAPA37,870401–

56Juniata County, PAPA23,403328–

57Susquehanna County, PAPA38,237327–

58Elk County, PAPA29,926316–

59Wayne County, PAPA51,703294–

60Montour County, PAPA17,868230–

61Potter County, PAPA15,897207–

62Wyoming County, PAPA25,790199–

63Snyder County, PAPA39,655188–

64Fulton County, PAPA14,483156–

65Cameron County, PAPA4,211115–

66Forest County, PAPA6,614105–

67Sullivan County, PAPA5,85643–

SHOWING 1–67 OF 67

Download CSV (full list, 67 rows)

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