RANKING · 2010 CENSUS · 67 SHOWN OF 67

Fastest shrinking, Pennsylvania counties · 2010

Pennsylvania counties with the steepest population decline from the 2000 census to 2010. 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, PAPA4,211-14.9%−15.9 pts

02Elk County, PAPA29,926-9.0%−9.7 pts

03Fayette County, PAPA123,021-8.1%−10.4 pts

04Beaver County, PAPA166,032-6.0%−3.5 pts

05Cambria County, PAPA128,968-5.8%+0.6 pts

06McKean County, PAPA38,984-5.4%−2.9 pts

07Greene County, PAPA33,885-4.9%−7.7 pts

08Armstrong County, PAPA63,698-4.8%−3.3 pts

09Warren County, PAPA37,038-4.7%−2.0 pts

10Allegheny County, PAPA1,225,035-4.6%−0.5 pts

11Venango County, PAPA49,346-4.5%−1.4 pts

12Clarion County, PAPA36,680-4.3%−4.4 pts

13Lawrence County, PAPA83,911-3.7%−2.1 pts

14Potter County, PAPA15,897-3.4%−11.6 pts

15Lycoming County, PAPA112,587-3.3%−4.4 pts

16Mercer County, PAPA107,860-3.0%−2.5 pts

17Somerset County, PAPA72,004-2.9%−5.2 pts

18Clearfield County, PAPA78,100-2.1%−8.9 pts

19Sullivan County, PAPA5,856-2.0%−9.4 pts

20Crawford County, PAPA81,792-1.8%−6.6 pts

21Jefferson County, PAPA43,255-1.6%−1.3 pts

22Blair County, PAPA119,541-1.6%−0.5 pts

23Schuylkill County, PAPA145,085-1.4%+0.1 pts

24Westmoreland County, PAPA349,324-1.3%−1.2 pts

25Indiana County, PAPA82,878-0.8%−0.4 pts

26Bedford County, PAPA47,480-0.4%−4.8 pts

27Bradford County, PAPA59,600-0.2%−3.2 pts

28Erie County, PAPA265,832-0.1%−2.0 pts

29Northumberland County, PAPA89,920-0.0%+2.3 pts

30Montour County, PAPA17,868+0.2%−2.7 pts

31Mifflin County, PAPA46,127+0.4%−0.2 pts

32Luzerne County, PAPA332,126+0.5%+3.2 pts

33Lackawanna County, PAPA216,502+0.5%+3.2 pts

34Philadelphia County, PAPA1,574,281+0.6%+4.8 pts

35Wyoming County, PAPA25,790+0.7%+0.7 pts

36Huntingdon County, PAPA43,001+0.7%−2.5 pts

37Tioga County, PAPA40,502+1.5%+0.9 pts

38Delaware County, PAPA580,937+1.5%+0.9 pts

39Washington County, PAPA210,802+2.4%+3.3 pts

40Susquehanna County, PAPA38,237+2.6%−2.0 pts

41Clinton County, PAPA37,870+3.5%+1.5 pts

42Fulton County, PAPA14,483+4.1%+1.0 pts

43Bucks County, PAPA647,828+4.6%−5.8 pts

44Columbia County, PAPA66,193+4.9%+3.4 pts

45Perry County, PAPA46,806+5.4%−0.5 pts

46Butler County, PAPA200,169+5.6%−8.9 pts

47Snyder County, PAPA39,655+5.7%+3.4 pts

48Dauphin County, PAPA293,351+6.5%+0.6 pts

49Montgomery County, PAPA877,643+6.6%−4.0 pts

50Juniata County, PAPA23,403+8.0%−2.7 pts

51Union County, PAPA42,313+8.0%−7.1 pts

52Berks County, PAPA440,072+10.1%−0.9 pts

53Cumberland County, PAPA277,270+10.2%+0.7 pts

54Lancaster County, PAPA563,159+10.4%−0.9 pts

55Wayne County, PAPA51,703+10.7%−8.8 pts

56Carbon County, PAPA65,868+11.0%+7.5 pts

57Lebanon County, PAPA146,380+11.0%+5.2 pts

58Adams County, PAPA107,594+11.1%−5.6 pts

59Northampton County, PAPA324,411+11.5%+3.4 pts

60Lehigh County, PAPA384,383+12.0%+4.8 pts

61Centre County, PAPA157,393+13.4%+3.8 pts

62York County, PAPA473,197+13.9%+1.5 pts

63Chester County, PAPA557,116+15.1%−0.1 pts

64Franklin County, PAPA160,652+15.7%+8.9 pts

65Monroe County, PAPA167,179+22.5%−22.4 pts

66Pike County, PAPA62,808+23.9%−41.7 pts

67Forest County, PAPA6,614+56.0%+53.0 pts

SHOWING 1–67 OF 67

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS