RANKING · 2020 CENSUS · 67 SHOWN OF 67

Fastest shrinking, Pennsylvania counties

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

RELATEDLargest by population Fastest growing Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Susquehanna County, PAPA38,237-11.4%−347%

02Cameron County, PAPA4,211-10.6%−1126%

03Forest County, PAPA6,614-9.6%−421%

04Sullivan County, PAPA5,856-9.1%−224%

05Venango County, PAPA49,346-8.2%+169%

06Wyoming County, PAPA25,790-7.8%−54885%

07Warren County, PAPA37,038-7.7%+193%

08Cambria County, PAPA128,968-7.1%+11%

09Greene County, PAPA33,885-7.1%−349%

10McKean County, PAPA38,984-6.9%+174%

11Clarion County, PAPA36,680-6.9%−4440%

12Indiana County, PAPA82,878-6.3%+1366%

13Potter County, PAPA15,897-6.1%−175%

14Fayette County, PAPA123,021-5.7%−352%

15Lawrence County, PAPA83,911-5.5%+232%

16Crawford County, PAPA81,792-5.4%−212%

17Mercer County, PAPA107,860-5.1%+775%

18Union County, PAPA42,313-5.0%−133%

19Armstrong County, PAPA63,698-4.9%+232%

20Somerset County, PAPA72,004-4.6%−301%

21Juniata County, PAPA23,403-4.6%−143%

22Clinton County, PAPA37,870-4.6%−331%

23Bedford County, PAPA47,480-4.4%−202%

24Bradford County, PAPA59,600-4.2%−244%

25Huntingdon County, PAPA43,001-4.0%−223%

26Columbia County, PAPA66,193-3.8%−354%

27Schuylkill County, PAPA145,085-3.5%+140%

28Erie County, PAPA265,832-3.5%−281%

29Blair County, PAPA119,541-3.4%+214%

30Wayne County, PAPA51,703-3.2%−116%

31Northumberland County, PAPA89,920-3.0%+33%

32Elk County, PAPA29,926-3.0%−546%

33Westmoreland County, PAPA349,324-2.9%+3148%

34Tioga County, PAPA40,502-2.2%−471%

35Fulton County, PAPA14,483-1.9%−164%

36Lycoming County, PAPA112,587-1.7%−247%

37Jefferson County, PAPA43,255-1.6%+378%

38Beaver County, PAPA166,032-1.4%−46%

39Clearfield County, PAPA78,100-1.3%−120%

40Mifflin County, PAPA46,127-1.2%−285%

41Monroe County, PAPA167,179-0.9%−102%

42Carbon County, PAPA65,868-0.8%−122%

43Montour County, PAPA17,868-0.7%−125%

44Perry County, PAPA46,806-0.3%−105%

45Snyder County, PAPA39,655+0.1%−96%

46Lackawanna County, PAPA216,502+0.7%−126%

47Washington County, PAPA210,802+0.7%−189%

48Luzerne County, PAPA332,126+1.5%−154%

49Pike County, PAPA62,808+2.0%−97%

50Allegheny County, PAPA1,225,035+2.2%−154%

51Adams County, PAPA107,594+2.4%−86%

52Centre County, PAPA157,393+2.7%−72%

53Delaware County, PAPA580,937+3.2%+444%

54Bucks County, PAPA647,828+3.4%−67%

55Franklin County, PAPA160,652+4.2%−38%

56Berks County, PAPA440,072+4.2%−62%

57York County, PAPA473,197+4.9%−60%

58Philadelphia County, PAPA1,574,281+5.1%−219%

59Northampton County, PAPA324,411+5.1%−37%

60Butler County, PAPA200,169+5.4%−63%

61Lancaster County, PAPA563,159+6.5%−43%

62Dauphin County, PAPA293,351+6.8%+16%

63Montgomery County, PAPA877,643+7.1%−33%

64Chester County, PAPA557,116+7.1%−53%

65Lehigh County, PAPA384,383+7.2%−0%

66Lebanon County, PAPA146,380+7.3%+25%

67Cumberland County, PAPA277,270+10.2%+8%

SHOWING 1–67 OF 67

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