RANKING · 2000 CENSUS · 67 SHOWN OF 67

Most population lost, Pennsylvania counties · 2000

Pennsylvania counties that lost the most residents from the 1990 census to 2000, 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 +1,334.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01Philadelphia County, PAPA1,574,281-68,027–

02Allegheny County, PAPA1,225,035-54,783–

03Cambria County, PAPA128,968-10,431–

04Luzerne County, PAPA332,126-8,899–

05Lackawanna County, PAPA216,502-5,744–

06Beaver County, PAPA166,032-4,681–

07Schuylkill County, PAPA145,085-2,249–

08Northumberland County, PAPA89,920-2,215–

09Venango County, PAPA49,346-1,816–

10Washington County, PAPA210,802-1,687–

11Lawrence County, PAPA83,911-1,603–

12Blair County, PAPA119,541-1,398–

13McKean County, PAPA38,984-1,195–

14Warren County, PAPA37,038-1,187–

15Armstrong County, PAPA63,698-1,086–

16Mercer County, PAPA107,860-710–

17Indiana County, PAPA82,878-389–

18Westmoreland County, PAPA349,324-328–

19Jefferson County, PAPA43,255-151–

20Wyoming County, PAPA25,790+4–

21Cameron County, PAPA4,211+61–

22Clarion County, PAPA36,680+66–

23Forest County, PAPA6,614+144–

24Elk County, PAPA29,926+234–

25Tioga County, PAPA40,502+247–

26Mifflin County, PAPA46,127+289–

27Fulton County, PAPA14,483+424–

28Sullivan County, PAPA5,856+452–

29Montour County, PAPA17,868+501–

30Clinton County, PAPA37,870+732–

31Snyder County, PAPA39,655+866–

32Columbia County, PAPA66,193+949–

33Greene County, PAPA33,885+1,122–

34Lycoming County, PAPA112,587+1,334–

35Potter County, PAPA15,897+1,363–

36Huntingdon County, PAPA43,001+1,422–

37Bradford County, PAPA59,600+1,794–

38Somerset County, PAPA72,004+1,805–

39Susquehanna County, PAPA38,237+1,858–

40Carbon County, PAPA65,868+1,956–

41Bedford County, PAPA47,480+2,065–

42Juniata County, PAPA23,403+2,196–

43Perry County, PAPA46,806+2,430–

44Delaware County, PAPA580,937+3,213–

45Fayette County, PAPA123,021+3,293–

46Crawford County, PAPA81,792+4,197–

47Erie County, PAPA265,832+5,271–

48Clearfield County, PAPA78,100+5,285–

49Union County, PAPA42,313+5,448–

50Lebanon County, PAPA146,380+6,583–

51Wayne County, PAPA51,703+7,778–

52Franklin County, PAPA160,652+8,231–

53Centre County, PAPA157,393+11,972–

54Adams County, PAPA107,594+13,018–

55Dauphin County, PAPA293,351+13,985–

56Pike County, PAPA62,808+18,336–

57Cumberland County, PAPA277,270+18,417–

58Northampton County, PAPA324,411+19,961–

59Lehigh County, PAPA384,383+20,960–

60Butler County, PAPA200,169+22,070–

61Berks County, PAPA440,072+37,115–

62York County, PAPA473,197+42,177–

63Monroe County, PAPA167,179+42,978–

64Lancaster County, PAPA563,159+47,836–

65Bucks County, PAPA647,828+56,461–

66Chester County, PAPA557,116+57,105–

67Montgomery County, PAPA877,643+71,986–

SHOWING 1–67 OF 67

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