RANKING · 2000 CENSUS · 67 SHOWN OF 67

Most population gained, Pennsylvania counties · 2000

Pennsylvania counties that added 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.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01Montgomery County, PAPA877,643+71,986–

02Chester County, PAPA557,116+57,105–

03Bucks County, PAPA647,828+56,461–

04Lancaster County, PAPA563,159+47,836–

05Monroe County, PAPA167,179+42,978–

06York County, PAPA473,197+42,177–

07Berks County, PAPA440,072+37,115–

08Butler County, PAPA200,169+22,070–

09Lehigh County, PAPA384,383+20,960–

10Northampton County, PAPA324,411+19,961–

11Cumberland County, PAPA277,270+18,417–

12Pike County, PAPA62,808+18,336–

13Dauphin County, PAPA293,351+13,985–

14Adams County, PAPA107,594+13,018–

15Centre County, PAPA157,393+11,972–

16Franklin County, PAPA160,652+8,231–

17Wayne County, PAPA51,703+7,778–

18Lebanon County, PAPA146,380+6,583–

19Union County, PAPA42,313+5,448–

20Clearfield County, PAPA78,100+5,285–

21Erie County, PAPA265,832+5,271–

22Crawford County, PAPA81,792+4,197–

23Fayette County, PAPA123,021+3,293–

24Delaware County, PAPA580,937+3,213–

25Perry County, PAPA46,806+2,430–

26Juniata County, PAPA23,403+2,196–

27Bedford County, PAPA47,480+2,065–

28Carbon County, PAPA65,868+1,956–

29Susquehanna County, PAPA38,237+1,858–

30Somerset County, PAPA72,004+1,805–

31Bradford County, PAPA59,600+1,794–

32Huntingdon County, PAPA43,001+1,422–

33Potter County, PAPA15,897+1,363–

34Lycoming County, PAPA112,587+1,334–

35Greene County, PAPA33,885+1,122–

36Columbia County, PAPA66,193+949–

37Snyder County, PAPA39,655+866–

38Clinton County, PAPA37,870+732–

39Montour County, PAPA17,868+501–

40Sullivan County, PAPA5,856+452–

41Fulton County, PAPA14,483+424–

42Mifflin County, PAPA46,127+289–

43Tioga County, PAPA40,502+247–

44Elk County, PAPA29,926+234–

45Forest County, PAPA6,614+144–

46Clarion County, PAPA36,680+66–

47Cameron County, PAPA4,211+61–

48Wyoming County, PAPA25,790+4–

49Jefferson County, PAPA43,255-151–

50Westmoreland County, PAPA349,324-328–

51Indiana County, PAPA82,878-389–

52Mercer County, PAPA107,860-710–

53Armstrong County, PAPA63,698-1,086–

54Warren County, PAPA37,038-1,187–

55McKean County, PAPA38,984-1,195–

56Blair County, PAPA119,541-1,398–

57Lawrence County, PAPA83,911-1,603–

58Washington County, PAPA210,802-1,687–

59Venango County, PAPA49,346-1,816–

60Northumberland County, PAPA89,920-2,215–

61Schuylkill County, PAPA145,085-2,249–

62Beaver County, PAPA166,032-4,681–

63Lackawanna County, PAPA216,502-5,744–

64Luzerne County, PAPA332,126-8,899–

65Cambria County, PAPA128,968-10,431–

66Allegheny County, PAPA1,225,035-54,783–

67Philadelphia County, PAPA1,574,281-68,027–

SHOWING 1–67 OF 67

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS