RANKING · 2025 ESTIMATES · 67 SHOWN OF 67

Fastest shrinking, Pennsylvania counties

Pennsylvania counties with the steepest population decline from the 2020 census to 2025. 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 by population Fastest growing Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Cameron County, PAPA4,211-7.4%−8.4 pts

02Greene County, PAPA33,885-5.8%−8.6 pts

03Forest County, PAPA6,614-5.1%−8.1 pts

04Fayette County, PAPA123,021-4.5%−6.8 pts

05Warren County, PAPA37,038-4.0%−1.4 pts

06McKean County, PAPA38,984-3.6%−1.0 pts

07Elk County, PAPA29,926-3.4%−4.1 pts

08Cambria County, PAPA128,968-3.4%+3.0 pts

09Clearfield County, PAPA78,100-3.1%−9.8 pts

10Potter County, PAPA15,897-3.0%−11.2 pts

11Somerset County, PAPA72,004-2.9%−5.2 pts

12Armstrong County, PAPA63,698-2.8%−1.4 pts

13Jefferson County, PAPA43,255-2.8%−2.5 pts

14Blair County, PAPA119,541-2.7%−1.6 pts

15Crawford County, PAPA81,792-2.6%−7.4 pts

16Mercer County, PAPA107,860-2.5%−1.9 pts

17Lawrence County, PAPA83,911-2.5%−0.8 pts

18Huntingdon County, PAPA43,001-2.5%−5.7 pts

19Venango County, PAPA49,346-2.2%+0.9 pts

20Allegheny County, PAPA1,225,035-2.0%+2.1 pts

21Northumberland County, PAPA89,920-1.9%+0.4 pts

22Erie County, PAPA265,832-1.9%−3.8 pts

23Philadelphia County, PAPA1,574,281-1.8%+2.4 pts

24Clarion County, PAPA36,680-1.5%−1.7 pts

25Westmoreland County, PAPA349,324-1.5%−1.4 pts

26Montour County, PAPA17,868-1.5%−4.3 pts

27Lycoming County, PAPA112,587-1.4%−2.5 pts

28Tioga County, PAPA40,502-1.3%−1.9 pts

29Beaver County, PAPA166,032-1.3%+1.2 pts

30Wyoming County, PAPA25,790-1.1%−1.1 pts

31Union County, PAPA42,313-0.9%−15.9 pts

32Monroe County, PAPA167,179-0.7%−45.6 pts

33Bradford County, PAPA59,600-0.6%−3.6 pts

34Susquehanna County, PAPA38,237-0.5%−5.1 pts

35Fulton County, PAPA14,483-0.5%−3.6 pts

36Centre County, PAPA157,393-0.5%−10.2 pts

37Juniata County, PAPA23,403-0.5%−11.1 pts

38Indiana County, PAPA82,878-0.4%−0.0 pts

39Bedford County, PAPA47,480-0.2%−4.5 pts

40Snyder County, PAPA39,655-0.2%−2.6 pts

41Mifflin County, PAPA46,127-0.0%−0.7 pts

42Bucks County, PAPA647,828+0.2%−10.2 pts

43Sullivan County, PAPA5,856+0.3%−7.1 pts

44Lackawanna County, PAPA216,502+0.3%+2.9 pts

45Washington County, PAPA210,802+0.7%+1.5 pts

46Delaware County, PAPA580,937+0.7%+0.1 pts

47Wayne County, PAPA51,703+1.1%−18.4 pts

48Clinton County, PAPA37,870+1.1%−0.8 pts

49Schuylkill County, PAPA145,085+1.4%+2.9 pts

50Carbon County, PAPA65,868+1.7%−1.7 pts

51Lancaster County, PAPA563,159+1.8%−9.5 pts

52Luzerne County, PAPA332,126+2.0%+4.7 pts

53Perry County, PAPA46,806+2.1%−3.8 pts

54Lebanon County, PAPA146,380+2.2%−3.6 pts

55Columbia County, PAPA66,193+2.3%+0.8 pts

56Dauphin County, PAPA293,351+2.4%−3.5 pts

57Montgomery County, PAPA877,643+2.5%−8.2 pts

58Berks County, PAPA440,072+2.6%−8.4 pts

59Lehigh County, PAPA384,383+2.6%−4.6 pts

60Franklin County, PAPA160,652+3.0%−3.8 pts

61Butler County, PAPA200,169+3.3%−11.2 pts

62Adams County, PAPA107,594+3.6%−13.0 pts

63Northampton County, PAPA324,411+3.7%−4.4 pts

64York County, PAPA473,197+3.7%−8.7 pts

65Chester County, PAPA557,116+4.2%−10.9 pts

66Cumberland County, PAPA277,270+6.9%−2.6 pts

67Pike County, PAPA62,808+7.3%−58.3 pts

SHOWING 1–67 OF 67

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES