RANKING · 2025 ESTIMATES · 67 SHOWN OF 67

Most population gained, Pennsylvania counties

Pennsylvania counties that added 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: Schuylkill County, PA, up 44 places to #17.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲2Chester County, PAPA557,116+22,703−60%

02Montgomery County, PAPA877,643+21,090−71%

03▲4Cumberland County, PAPA277,270+17,801−3%

04▲4York County, PAPA473,197+16,759−60%

05▲8Northampton County, PAPA324,411+11,460−43%

06▲6Berks County, PAPA440,072+11,223−70%

07▼3Lancaster County, PAPA563,159+10,175−79%

08▼2Lehigh County, PAPA384,383+9,826−53%

09▲1Dauphin County, PAPA293,351+6,950−50%

10▲7Luzerne County, PAPA332,126+6,532−173%

11▲3Butler County, PAPA200,169+6,406−71%

12▲4Franklin County, PAPA160,652+4,720−43%

13▲9Pike County, PAPA62,808+4,273−77%

14▼3Delaware County, PAPA580,937+4,107+28%

15▲4Adams County, PAPA107,594+3,742−71%

16▼1Lebanon County, PAPA146,380+3,123−53%

17▲44Schuylkill County, PAPA145,085+2,036−191%

18▲29Columbia County, PAPA66,193+1,466+54%

19▲1Washington County, PAPA210,802+1,453−186%

20▼11Bucks County, PAPA647,828+1,290−98%

21▲6Carbon County, PAPA65,868+1,119−43%

22▲2Perry County, PAPA46,806+964−60%

23▼2Lackawanna County, PAPA216,502+606−111%

24▲15Wayne County, PAPA51,703+548−93%

25▲15Clinton County, PAPA37,870+420−43%

26▲4Sullivan County, PAPA5,856+16−96%

27▲2Mifflin County, PAPA46,127-16−106%

28▼2Fulton County, PAPA14,483-73−117%

29▼6Snyder County, PAPA39,655-81−109%

30▲13Bedford County, PAPA47,480-97−105%

31▲6Juniata County, PAPA23,403-106−105%

32▲27Susquehanna County, PAPA38,237-197−111%

33▼8Montour County, PAPA17,868-268−153%

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

35▼7Cameron County, PAPA4,211-336−651%

36▼4Forest County, PAPA6,614-359−349%

37▲11Bradford County, PAPA59,600-367−120%

38▲24Indiana County, PAPA82,878-368−5%

39▲6Union County, PAPA42,313-368−107%

40▼5Potter County, PAPA15,897-499−137%

41▼8Tioga County, PAPA40,502-543−320%

42▲8Clarion County, PAPA36,680-561−950%

43▼25Centre County, PAPA157,393-779−107%

44▼10Elk County, PAPA29,926-1,064−555%

45▼4Huntingdon County, PAPA43,001-1,091−177%

46▲11Venango County, PAPA49,346-1,108−39%

47▼9Monroe County, PAPA167,179-1,148−103%

48▼17Jefferson County, PAPA43,255-1,237+719%

49▲3McKean County, PAPA38,984-1,448+21%

50▲3Warren County, PAPA37,038-1,549+30%

51▼9Lycoming County, PAPA112,587-1,601−220%

52▼1Northumberland County, PAPA89,920-1,727−22%

53▲1Armstrong County, PAPA63,698-1,860+71%

54▼5Greene County, PAPA33,885-2,069−284%

55Somerset County, PAPA72,004-2,125−218%

56▲2Crawford County, PAPA81,792-2,146−151%

57▲3Lawrence County, PAPA83,911-2,159+35%

58▼12Beaver County, PAPA166,032-2,183−53%

59▼23Clearfield County, PAPA78,100-2,462−147%

60▲3Mercer County, PAPA107,860-2,792+293%

61▼5Blair County, PAPA119,541-3,281+135%

62▲4Cambria County, PAPA128,968-4,504−57%

63▲2Erie County, PAPA265,832-5,044−196%

64▲3Westmoreland County, PAPA349,324-5,339+1528%

65▼1Fayette County, PAPA123,021-5,783−276%

66▼61Allegheny County, PAPA1,225,035-25,543−53%

67▼66Philadelphia County, PAPA1,574,281-29,516−57%

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