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%−816%

02Greene County, PAPA33,885-5.8%−303%

03Forest County, PAPA6,614-5.1%−272%

04Fayette County, PAPA123,021-4.5%−298%

05Warren County, PAPA37,038-4.0%+52%

06McKean County, PAPA38,984-3.6%+41%

07Elk County, PAPA29,926-3.4%−612%

08Cambria County, PAPA128,968-3.4%−47%

09Clearfield County, PAPA78,100-3.1%−145%

10Potter County, PAPA15,897-3.0%−137%

11Somerset County, PAPA72,004-2.9%−224%

12Armstrong County, PAPA63,698-2.8%+92%

13Jefferson County, PAPA43,255-2.8%+748%

14Blair County, PAPA119,541-2.7%+149%

15Crawford County, PAPA81,792-2.6%−152%

16Mercer County, PAPA107,860-2.5%+330%

17Lawrence County, PAPA83,911-2.5%+51%

18Huntingdon County, PAPA43,001-2.5%−177%

19Venango County, PAPA49,346-2.2%−28%

20Allegheny County, PAPA1,225,035-2.0%−50%

21Northumberland County, PAPA89,920-1.9%−18%

22Erie County, PAPA265,832-1.9%−197%

23Philadelphia County, PAPA1,574,281-1.8%−57%

24Clarion County, PAPA36,680-1.5%−1052%

25Westmoreland County, PAPA349,324-1.5%+1600%

26Montour County, PAPA17,868-1.5%−152%

27Lycoming County, PAPA112,587-1.4%−225%

28Tioga County, PAPA40,502-1.3%−320%

29Beaver County, PAPA166,032-1.3%−48%

30Wyoming County, PAPA25,790-1.1%−7612%

31Union County, PAPA42,313-0.9%−106%

32Monroe County, PAPA167,179-0.7%−102%

33Bradford County, PAPA59,600-0.6%−121%

34Susquehanna County, PAPA38,237-0.5%−111%

35Fulton County, PAPA14,483-0.5%−116%

36Centre County, PAPA157,393-0.5%−105%

37Juniata County, PAPA23,403-0.5%−104%

38Indiana County, PAPA82,878-0.4%+2%

39Bedford County, PAPA47,480-0.2%−105%

40Snyder County, PAPA39,655-0.2%−109%

41Mifflin County, PAPA46,127-0.0%−106%

42Bucks County, PAPA647,828+0.2%−98%

43Sullivan County, PAPA5,856+0.3%−96%

44Lackawanna County, PAPA216,502+0.3%−111%

45Washington County, PAPA210,802+0.7%−184%

46Delaware County, PAPA580,937+0.7%+21%

47Wayne County, PAPA51,703+1.1%−94%

48Clinton County, PAPA37,870+1.1%−43%

49Schuylkill County, PAPA145,085+1.4%−197%

50Carbon County, PAPA65,868+1.7%−50%

51Lancaster County, PAPA563,159+1.8%−84%

52Luzerne County, PAPA332,126+2.0%−174%

53Perry County, PAPA46,806+2.1%−64%

54Lebanon County, PAPA146,380+2.2%−62%

55Columbia County, PAPA66,193+2.3%+51%

56Dauphin County, PAPA293,351+2.4%−59%

57Montgomery County, PAPA877,643+2.5%−77%

58Berks County, PAPA440,072+2.6%−76%

59Lehigh County, PAPA384,383+2.6%−64%

60Franklin County, PAPA160,652+3.0%−55%

61Butler County, PAPA200,169+3.3%−77%

62Adams County, PAPA107,594+3.6%−78%

63Northampton County, PAPA324,411+3.7%−55%

64York County, PAPA473,197+3.7%−70%

65Chester County, PAPA557,116+4.2%−72%

66Cumberland County, PAPA277,270+6.9%−27%

67Pike County, PAPA62,808+7.3%−89%

SHOWING 1–67 OF 67

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES