RANKING · 2020 CENSUS · 67 SHOWN OF 67

Largest Irish population, Pennsylvania counties · 2020

Pennsylvania counties ranked by the number of residents who are 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. The median across all 67 is 12,550.

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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

RANKPLACESTATEPOPIRISH POPULATIONVS 2010

01Allegheny County, PAPA1,225,035208,482−16%

02Montgomery County, PAPA877,643167,521−6%

03Philadelphia County, PAPA1,574,281160,283−18%

04Bucks County, PAPA647,828149,819−10%

05Delaware County, PAPA580,937135,420−15%

06Chester County, PAPA557,116111,461−6%

07Westmoreland County, PAPA349,32460,387−9%

08Lancaster County, PAPA563,15955,642−5%

09Luzerne County, PAPA332,12655,627−13%

10York County, PAPA473,19755,193−1%

11Lackawanna County, PAPA216,50252,887−10%

12Berks County, PAPA440,07243,396−17%

13Erie County, PAPA265,83242,360−16%

14Northampton County, PAPA324,41140,531−6%

15Lehigh County, PAPA384,38338,967−9%

16Butler County, PAPA200,16937,056−6%

17Washington County, PAPA210,80234,305−13%

18Cumberland County, PAPA277,27033,805−7%

19Dauphin County, PAPA293,35127,275−16%

20Beaver County, PAPA166,03226,919−18%

21Schuylkill County, PAPA145,08525,283−13%

22Monroe County, PAPA167,17923,363−18%

23Cambria County, PAPA128,96822,496−16%

24Fayette County, PAPA123,02121,341−10%

25Blair County, PAPA119,54120,531−20%

26Centre County, PAPA157,39320,2210%

27Mercer County, PAPA107,86017,813−10%

28Franklin County, PAPA160,65216,666−11%

29Lycoming County, PAPA112,58715,707−9%

30Lawrence County, PAPA83,91114,968−6%

31Lebanon County, PAPA146,38013,713−10%

32Crawford County, PAPA81,79213,498−16%

33Pike County, PAPA62,80813,248+4%

34Indiana County, PAPA82,87812,550−30%

35Adams County, PAPA107,59412,376−15%

36Armstrong County, PAPA63,69811,257−16%

37Carbon County, PAPA65,8689,893−7%

38Wayne County, PAPA51,7039,674−24%

39Northumberland County, PAPA89,9209,502−12%

40Clearfield County, PAPA78,1009,063−13%

41Bradford County, PAPA59,6009,042−12%

42Venango County, PAPA49,3468,257−17%

43Susquehanna County, PAPA38,2378,219−11%

44Somerset County, PAPA72,0048,213−13%

45Columbia County, PAPA66,1937,058−21%

46McKean County, PAPA38,9846,680−12%

47Huntingdon County, PAPA43,0016,165−20%

48Mifflin County, PAPA46,1276,0460%

49Clarion County, PAPA36,6805,950−9%

50Warren County, PAPA37,0385,566−7%

51Greene County, PAPA33,8855,323−29%

52Jefferson County, PAPA43,2555,277−20%

53Tioga County, PAPA40,5025,170−9%

54Bedford County, PAPA47,4804,977−16%

55Perry County, PAPA46,8064,929−27%

56Clinton County, PAPA37,8704,702−19%

57Wyoming County, PAPA25,7904,547−19%

58Elk County, PAPA29,9263,893−23%

59Union County, PAPA42,3133,883−20%

60Snyder County, PAPA39,6553,571−2%

61Juniata County, PAPA23,4032,269−26%

62Potter County, PAPA15,8972,079−21%

63Montour County, PAPA17,8681,841−11%

64Fulton County, PAPA14,4831,513−27%

65Sullivan County, PAPA5,8561,199−10%

66Forest County, PAPA6,614748−25%

67Cameron County, PAPA4,211427−43%

SHOWING 1–67 OF 67

Download CSV (full list, 67 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS