RANKING · 2020 CENSUS · 67 SHOWN OF 67

Highest Scotch-Irish population share, Pennsylvania counties · 2020

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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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 SHAREVS 2000

01Washington County, PAPA210,8023.6%–

02Lawrence County, PAPA83,9113.4%–

03Butler County, PAPA200,1693.0%–

04Greene County, PAPA33,8852.8%–

05Mercer County, PAPA107,8602.8%–

06Armstrong County, PAPA63,6982.7%–

07Perry County, PAPA46,8062.7%–

08Venango County, PAPA49,3462.6%–

09Cameron County, PAPA4,2112.5%–

10Beaver County, PAPA166,0322.4%–

11Huntingdon County, PAPA43,0012.1%–

12Indiana County, PAPA82,8782.1%–

13Clarion County, PAPA36,6802.0%–

14Westmoreland County, PAPA349,3242.0%–

15Mifflin County, PAPA46,1272.0%–

16Franklin County, PAPA160,6521.9%–

17Crawford County, PAPA81,7921.9%–

18Warren County, PAPA37,0381.8%–

19Jefferson County, PAPA43,2551.8%–

20Tioga County, PAPA40,5021.6%–

21McKean County, PAPA38,9841.6%–

22Clearfield County, PAPA78,1001.5%–

23Cumberland County, PAPA277,2701.5%–

24Allegheny County, PAPA1,225,0351.5%–

25Forest County, PAPA6,6141.5%–

26Fayette County, PAPA123,0211.5%–

27Centre County, PAPA157,3931.4%–

28Erie County, PAPA265,8321.4%–

29Juniata County, PAPA23,4031.3%–

30Adams County, PAPA107,5941.3%–

31Blair County, PAPA119,5411.3%–

32Montour County, PAPA17,8681.3%–

33Potter County, PAPA15,8971.2%–

34York County, PAPA473,1971.2%–

35Chester County, PAPA557,1161.1%–

36Fulton County, PAPA14,4831.1%–

37Cambria County, PAPA128,9681.1%–

38Elk County, PAPA29,9261.1%–

39Lancaster County, PAPA563,1591.1%–

40Clinton County, PAPA37,8701.0%–

41Union County, PAPA42,3131.0%–

42Dauphin County, PAPA293,3511.0%–

43Bucks County, PAPA647,8281.0%–

44Lebanon County, PAPA146,3800.9%–

45Bedford County, PAPA47,4800.9%–

46Somerset County, PAPA72,0040.9%–

47Lycoming County, PAPA112,5870.9%–

48Bradford County, PAPA59,6000.9%–

49Susquehanna County, PAPA38,2370.8%–

50Delaware County, PAPA580,9370.8%–

51Pike County, PAPA62,8080.8%–

52Montgomery County, PAPA877,6430.8%–

53Monroe County, PAPA167,1790.7%–

54Wyoming County, PAPA25,7900.7%–

55Sullivan County, PAPA5,8560.7%–

56Carbon County, PAPA65,8680.7%–

57Columbia County, PAPA66,1930.6%–

58Wayne County, PAPA51,7030.6%–

59Northumberland County, PAPA89,9200.6%–

60Northampton County, PAPA324,4110.6%–

61Berks County, PAPA440,0720.5%–

62Snyder County, PAPA39,6550.5%–

63Lehigh County, PAPA384,3830.4%–

64Schuylkill County, PAPA145,0850.4%–

65Lackawanna County, PAPA216,5020.3%–

66Luzerne County, PAPA332,1260.3%–

67Philadelphia County, PAPA1,574,2810.3%–

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