RANKING · 2024 ACS · 67 SHOWN OF 67

Highest Scotch-Irish population share, Pennsylvania counties

Pennsylvania counties ranked by the share of all residents who are Scotch-Irish ancestry (2023 American Community Survey). A concentration measure: Scotch-Irish residents as a percentage of total population. This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide.

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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 SHAREVS 2000

01Lawrence County, PAPA83,9112.8%–

02Washington County, PAPA210,8022.5%–

03Butler County, PAPA200,1692.4%–

04Venango County, PAPA49,3462.0%–

05Indiana County, PAPA82,8781.9%–

06Huntingdon County, PAPA43,0011.9%–

07Mercer County, PAPA107,8601.8%–

08Armstrong County, PAPA63,6981.8%–

09Beaver County, PAPA166,0321.7%–

10Greene County, PAPA33,8851.7%–

11Crawford County, PAPA81,7921.7%–

12Perry County, PAPA46,8061.7%–

13Warren County, PAPA37,0381.6%–

14Jefferson County, PAPA43,2551.6%–

15Franklin County, PAPA160,6521.5%–

16Westmoreland County, PAPA349,3241.4%–

17Allegheny County, PAPA1,225,0351.3%–

18Clarion County, PAPA36,6801.3%–

19Montour County, PAPA17,8681.3%–

20Forest County, PAPA6,6141.1%–

21Cumberland County, PAPA277,2701.1%–

22Mifflin County, PAPA46,1271.1%–

23Centre County, PAPA157,3931.1%–

24York County, PAPA473,1971.1%–

25Chester County, PAPA557,1161.0%–

26Tioga County, PAPA40,5021.0%–

27Adams County, PAPA107,5941.0%–

28Juniata County, PAPA23,4031.0%–

29Erie County, PAPA265,8320.9%–

30Fayette County, PAPA123,0210.9%–

31Clearfield County, PAPA78,1000.9%–

32Bradford County, PAPA59,6000.9%–

33Lycoming County, PAPA112,5870.9%–

34Blair County, PAPA119,5410.8%–

35Fulton County, PAPA14,4830.8%–

36Lancaster County, PAPA563,1590.8%–

37Potter County, PAPA15,8970.8%–

38Cambria County, PAPA128,9680.8%–

39Bucks County, PAPA647,8280.8%–

40Dauphin County, PAPA293,3510.8%–

41McKean County, PAPA38,9840.8%–

42Union County, PAPA42,3130.8%–

43Somerset County, PAPA72,0040.7%–

44Montgomery County, PAPA877,6430.7%–

45Elk County, PAPA29,9260.6%–

46Delaware County, PAPA580,9370.6%–

47Bedford County, PAPA47,4800.6%–

48Susquehanna County, PAPA38,2370.5%–

49Wayne County, PAPA51,7030.5%–

50Pike County, PAPA62,8080.5%–

51Northampton County, PAPA324,4110.5%–

52Berks County, PAPA440,0720.5%–

53Carbon County, PAPA65,8680.5%–

54Snyder County, PAPA39,6550.5%–

55Northumberland County, PAPA89,9200.5%–

56Lebanon County, PAPA146,3800.4%–

57Wyoming County, PAPA25,7900.4%–

58Sullivan County, PAPA5,8560.4%–

59Columbia County, PAPA66,1930.4%–

60Luzerne County, PAPA332,1260.4%–

61Lehigh County, PAPA384,3830.3%–

62Clinton County, PAPA37,8700.3%–

63Monroe County, PAPA167,1790.3%–

64Schuylkill County, PAPA145,0850.3%–

65Philadelphia County, PAPA1,574,2810.3%–

66Cameron County, PAPA4,2110.2%–

67Lackawanna County, PAPA216,5020.2%–

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