RANKING · 2020 CENSUS · 67 SHOWN OF 67

Fastest growing, Pennsylvania counties · 2020

Pennsylvania counties ranked by population growth from the 2010 census to 2020. 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Cumberland County, PAPA277,270+10.2%+8%

02Lebanon County, PAPA146,380+7.3%+25%

03Lehigh County, PAPA384,383+7.2%−0%

04Chester County, PAPA557,116+7.1%−53%

05Montgomery County, PAPA877,643+7.1%−33%

06Dauphin County, PAPA293,351+6.8%+16%

07Lancaster County, PAPA563,159+6.5%−43%

08Butler County, PAPA200,169+5.4%−63%

09Northampton County, PAPA324,411+5.1%−37%

10Philadelphia County, PAPA1,574,281+5.1%−219%

11York County, PAPA473,197+4.9%−60%

12Berks County, PAPA440,072+4.2%−62%

13Franklin County, PAPA160,652+4.2%−38%

14Bucks County, PAPA647,828+3.4%−67%

15Delaware County, PAPA580,937+3.2%+444%

16Centre County, PAPA157,393+2.7%−72%

17Adams County, PAPA107,594+2.4%−86%

18Allegheny County, PAPA1,225,035+2.2%−154%

19Pike County, PAPA62,808+2.0%−97%

20Luzerne County, PAPA332,126+1.5%−154%

21Washington County, PAPA210,802+0.7%−189%

22Lackawanna County, PAPA216,502+0.7%−126%

23Snyder County, PAPA39,655+0.1%−96%

24Perry County, PAPA46,806-0.3%−105%

25Montour County, PAPA17,868-0.7%−125%

26Carbon County, PAPA65,868-0.8%−122%

27Monroe County, PAPA167,179-0.9%−102%

28Mifflin County, PAPA46,127-1.2%−285%

29Clearfield County, PAPA78,100-1.3%−120%

30Beaver County, PAPA166,032-1.4%−46%

31Jefferson County, PAPA43,255-1.6%+378%

32Lycoming County, PAPA112,587-1.7%−247%

33Fulton County, PAPA14,483-1.9%−164%

34Tioga County, PAPA40,502-2.2%−471%

35Westmoreland County, PAPA349,324-2.9%+3148%

36Elk County, PAPA29,926-3.0%−546%

37Northumberland County, PAPA89,920-3.0%+33%

38Wayne County, PAPA51,703-3.2%−116%

39Blair County, PAPA119,541-3.4%+214%

40Erie County, PAPA265,832-3.5%−281%

41Schuylkill County, PAPA145,085-3.5%+140%

42Columbia County, PAPA66,193-3.8%−354%

43Huntingdon County, PAPA43,001-4.0%−223%

44Bradford County, PAPA59,600-4.2%−244%

45Bedford County, PAPA47,480-4.4%−202%

46Clinton County, PAPA37,870-4.6%−331%

47Juniata County, PAPA23,403-4.6%−143%

48Somerset County, PAPA72,004-4.6%−301%

49Armstrong County, PAPA63,698-4.9%+232%

50Union County, PAPA42,313-5.0%−133%

51Mercer County, PAPA107,860-5.1%+775%

52Crawford County, PAPA81,792-5.4%−212%

53Lawrence County, PAPA83,911-5.5%+232%

54Fayette County, PAPA123,021-5.7%−352%

55Potter County, PAPA15,897-6.1%−175%

56Indiana County, PAPA82,878-6.3%+1366%

57Clarion County, PAPA36,680-6.9%−4440%

58McKean County, PAPA38,984-6.9%+174%

59Greene County, PAPA33,885-7.1%−349%

60Cambria County, PAPA128,968-7.1%+11%

61Warren County, PAPA37,038-7.7%+193%

62Wyoming County, PAPA25,790-7.8%−54885%

63Venango County, PAPA49,346-8.2%+169%

64Sullivan County, PAPA5,856-9.1%−224%

65Forest County, PAPA6,614-9.6%−421%

66Cameron County, PAPA4,211-10.6%−1126%

67Susquehanna County, PAPA38,237-11.4%−347%

SHOWING 1–67 OF 67

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