RANKING · 2025 ESTIMATES · 67 SHOWN OF 67

Most population lost, Pennsylvania counties

Pennsylvania counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide. The median across all 67 is -279. Biggest climber in the top 100 since 2020: Philadelphia County, PA, up 66 places to #1.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲66Philadelphia County, PAPA1,574,281-29,516−57%

02▲61Allegheny County, PAPA1,225,035-25,543−53%

03▲1Fayette County, PAPA123,021-5,783−276%

04▼3Westmoreland County, PAPA349,324-5,339+1528%

05▼2Erie County, PAPA265,832-5,044−196%

06▼4Cambria County, PAPA128,968-4,504−57%

07▲5Blair County, PAPA119,541-3,281+135%

08▼3Mercer County, PAPA107,860-2,792+293%

09▲23Clearfield County, PAPA78,100-2,462−147%

10▲12Beaver County, PAPA166,032-2,183−53%

11▼3Lawrence County, PAPA83,911-2,159+35%

12▼2Crawford County, PAPA81,792-2,146−151%

13Somerset County, PAPA72,004-2,125−218%

14▲5Greene County, PAPA33,885-2,069−284%

15▼1Armstrong County, PAPA63,698-1,860+71%

16▲1Northumberland County, PAPA89,920-1,727−22%

17▲9Lycoming County, PAPA112,587-1,601−220%

18▼3Warren County, PAPA37,038-1,549+30%

19▼3McKean County, PAPA38,984-1,448+21%

20▲17Jefferson County, PAPA43,255-1,237+719%

21▲9Monroe County, PAPA167,179-1,148−103%

22▼11Venango County, PAPA49,346-1,108−39%

23▲4Huntingdon County, PAPA43,001-1,091−177%

24▲10Elk County, PAPA29,926-1,064−555%

25▲25Centre County, PAPA157,393-779−107%

26▼8Clarion County, PAPA36,680-561−950%

27▲8Tioga County, PAPA40,502-543−320%

28▲5Potter County, PAPA15,897-499−137%

29▼23Indiana County, PAPA82,878-368−5%

30▼7Union County, PAPA42,313-368−107%

31▼11Bradford County, PAPA59,600-367−120%

32▲4Forest County, PAPA6,614-359−349%

33▲7Cameron County, PAPA4,211-336−651%

34▼10Wyoming County, PAPA25,790-279−7075%

35▲8Montour County, PAPA17,868-268−153%

36▼27Susquehanna County, PAPA38,237-197−111%

37▼6Juniata County, PAPA23,403-106−105%

38▼13Bedford County, PAPA47,480-97−105%

39▲6Snyder County, PAPA39,655-81−109%

40▲2Fulton County, PAPA14,483-73−117%

41▼2Mifflin County, PAPA46,127-16−106%

42▼4Sullivan County, PAPA5,856+16−96%

43▼15Clinton County, PAPA37,870+420−43%

44▼15Wayne County, PAPA51,703+548−93%

45▲2Lackawanna County, PAPA216,502+606−111%

46▼2Perry County, PAPA46,806+964−60%

47▼6Carbon County, PAPA65,868+1,119−43%

48▲11Bucks County, PAPA647,828+1,290−98%

49▼1Washington County, PAPA210,802+1,453−186%

50▼29Columbia County, PAPA66,193+1,466+54%

51▼44Schuylkill County, PAPA145,085+2,036−191%

52▲1Lebanon County, PAPA146,380+3,123−53%

53▼4Adams County, PAPA107,594+3,742−71%

54▲3Delaware County, PAPA580,937+4,107+28%

55▼9Pike County, PAPA62,808+4,273−77%

56▼4Franklin County, PAPA160,652+4,720−43%

57▼3Butler County, PAPA200,169+6,406−71%

58▼7Luzerne County, PAPA332,126+6,532−173%

59▼1Dauphin County, PAPA293,351+6,950−50%

60▲2Lehigh County, PAPA384,383+9,826−53%

61▲3Lancaster County, PAPA563,159+10,175−79%

62▼6Berks County, PAPA440,072+11,223−70%

63▼8Northampton County, PAPA324,411+11,460−43%

64▼4York County, PAPA473,197+16,759−60%

65▼4Cumberland County, PAPA277,270+17,801−3%

66Montgomery County, PAPA877,643+21,090−71%

67▼2Chester County, PAPA557,116+22,703−60%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES