RANKING · 2010 CENSUS · 67 SHOWN OF 67

Fastest shrinking, Pennsylvania counties · 2010

Pennsylvania counties with the steepest population decline since the prior decennial census. 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

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Cameron County, PAPA4,211-14.9%−1542%

02Elk County, PAPA29,926-9.0%−1444%

03Fayette County, PAPA123,021-8.1%−457%

04Beaver County, PAPA166,032-6.0%+138%

05Cambria County, PAPA128,968-5.8%−9%

06McKean County, PAPA38,984-5.4%+113%

07Greene County, PAPA33,885-4.9%−272%

08Armstrong County, PAPA63,698-4.8%+223%

09Warren County, PAPA37,038-4.7%+77%

10Allegheny County, PAPA1,225,035-4.6%+11%

11Venango County, PAPA49,346-4.5%+47%

12Clarion County, PAPA36,680-4.3%−2788%

13Lawrence County, PAPA83,911-3.7%+124%

14Potter County, PAPA15,897-3.4%−142%

15Lycoming County, PAPA112,587-3.3%−392%

16Mercer County, PAPA107,860-3.0%+418%

17Somerset County, PAPA72,004-2.9%−224%

18Clearfield County, PAPA78,100-2.1%−131%

19Sullivan County, PAPA5,856-2.0%−126%

20Crawford County, PAPA81,792-1.8%−136%

21Jefferson County, PAPA43,255-1.6%+386%

22Blair County, PAPA119,541-1.6%+49%

23Schuylkill County, PAPA145,085-1.4%−8%

24Westmoreland County, PAPA349,324-1.3%+1372%

25Indiana County, PAPA82,878-0.8%+87%

26Bedford County, PAPA47,480-0.4%−110%

27Bradford County, PAPA59,600-0.2%−108%

28Erie County, PAPA265,832-0.1%−105%

29Northumberland County, PAPA89,920-0.0%−99%

30Montour County, PAPA17,868+0.2%−94%

31Mifflin County, PAPA46,127+0.4%−33%

32Luzerne County, PAPA332,126+0.5%−119%

33Lackawanna County, PAPA216,502+0.5%−120%

34Philadelphia County, PAPA1,574,281+0.6%−113%

35Wyoming County, PAPA25,790+0.7%+4799%

36Huntingdon County, PAPA43,001+0.7%−78%

37Tioga County, PAPA40,502+1.5%+145%

38Delaware County, PAPA580,937+1.5%+151%

39Washington County, PAPA210,802+2.4%−394%

40Susquehanna County, PAPA38,237+2.6%−42%

41Clinton County, PAPA37,870+3.5%+77%

42Fulton County, PAPA14,483+4.1%+34%

43Bucks County, PAPA647,828+4.6%−56%

44Columbia County, PAPA66,193+4.9%+226%

45Perry County, PAPA46,806+5.4%−8%

46Butler County, PAPA200,169+5.6%−61%

47Snyder County, PAPA39,655+5.7%+143%

48Dauphin County, PAPA293,351+6.5%+10%

49Montgomery County, PAPA877,643+6.6%−37%

50Juniata County, PAPA23,403+8.0%−25%

51Union County, PAPA42,313+8.0%−47%

52Berks County, PAPA440,072+10.1%−8%

53Cumberland County, PAPA277,270+10.2%+8%

54Lancaster County, PAPA563,159+10.4%−8%

55Wayne County, PAPA51,703+10.7%−45%

56Carbon County, PAPA65,868+11.0%+219%

57Lebanon County, PAPA146,380+11.0%+90%

58Adams County, PAPA107,594+11.1%−33%

59Northampton County, PAPA324,411+11.5%+42%

60Lehigh County, PAPA384,383+12.0%+66%

61Centre County, PAPA157,393+13.4%+39%

62York County, PAPA473,197+13.9%+12%

63Chester County, PAPA557,116+15.1%−1%

64Franklin County, PAPA160,652+15.7%+131%

65Monroe County, PAPA167,179+22.5%−50%

66Pike County, PAPA62,808+23.9%−64%

67Forest County, PAPA6,614+56.0%+1768%

SHOWING 1–67 OF 67

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES