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 2020 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.

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

01Allegheny County, PAPA1,225,03517,936−41%

02Washington County, PAPA210,8027,459−34%

03Westmoreland County, PAPA349,3246,983−39%

04Montgomery County, PAPA877,6436,234−56%

05Bucks County, PAPA647,8286,030−48%

06Chester County, PAPA557,1165,903−53%

07Lancaster County, PAPA563,1595,705−43%

08Butler County, PAPA200,1695,700−34%

09York County, PAPA473,1975,416−39%

10Delaware County, PAPA580,9374,370−56%

11Philadelphia County, PAPA1,574,2814,015−59%

12Beaver County, PAPA166,0323,921−41%

13Cumberland County, PAPA277,2703,785−43%

14Erie County, PAPA265,8323,675−47%

15Mercer County, PAPA107,8603,109−39%

16Franklin County, PAPA160,6522,910−31%

17Lawrence County, PAPA83,9112,908−45%

18Dauphin County, PAPA293,3512,674−50%

19Berks County, PAPA440,0722,286−49%

20Centre County, PAPA157,3932,211−29%

21Fayette County, PAPA123,0211,890−30%

22Indiana County, PAPA82,8781,776−52%

23Armstrong County, PAPA63,6981,769−29%

24Northampton County, PAPA324,4111,705−50%

25Blair County, PAPA119,5411,602−50%

26Crawford County, PAPA81,7921,582−52%

27Lehigh County, PAPA384,3831,438−59%

28Cambria County, PAPA128,9681,416−44%

29Adams County, PAPA107,5941,362−30%

30Lebanon County, PAPA146,3801,329−33%

31Venango County, PAPA49,3461,324−45%

32Monroe County, PAPA167,1791,254−39%

33Perry County, PAPA46,8061,248+11%

34Clearfield County, PAPA78,1001,222−23%

35Greene County, PAPA33,8851,037−46%

36Lycoming County, PAPA112,587983−43%

37Huntingdon County, PAPA43,001957−26%

38Luzerne County, PAPA332,126934−62%

39Mifflin County, PAPA46,127912−29%

40Clarion County, PAPA36,680784−43%

41Jefferson County, PAPA43,255774−43%

42Warren County, PAPA37,038726−42%

43Lackawanna County, PAPA216,502674−65%

44Tioga County, PAPA40,502670−21%

45McKean County, PAPA38,984665−21%

46Somerset County, PAPA72,004659−47%

47Bradford County, PAPA59,600521−52%

48Northumberland County, PAPA89,920515−48%

49Schuylkill County, PAPA145,085507−27%

50Union County, PAPA42,313459−23%

51Bedford County, PAPA47,480446−51%

52Pike County, PAPA62,808424−29%

53Columbia County, PAPA66,193423−36%

54Carbon County, PAPA65,868416−27%

55Clinton County, PAPA37,870401−47%

56Juniata County, PAPA23,403328−44%

57Susquehanna County, PAPA38,237327−59%

58Elk County, PAPA29,926316−37%

59Wayne County, PAPA51,703294−53%

60Montour County, PAPA17,868230+0%

61Potter County, PAPA15,897207−31%

62Wyoming County, PAPA25,790199−46%

63Snyder County, PAPA39,655188−46%

64Fulton County, PAPA14,483156−42%

65Cameron County, PAPA4,211115−4%

66Forest County, PAPA6,614105−53%

67Sullivan County, PAPA5,85643−71%

SHOWING 1–67 OF 67

Download CSV (full list, 67 rows)

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