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%+0.8 pts

02Lebanon County, PAPA146,380+7.3%+1.5 pts

03Lehigh County, PAPA384,383+7.2%−0.0 pts

04Chester County, PAPA557,116+7.1%−8.1 pts

05Montgomery County, PAPA877,643+7.1%−3.5 pts

06Dauphin County, PAPA293,351+6.8%+0.9 pts

07Lancaster County, PAPA563,159+6.5%−4.9 pts

08Butler County, PAPA200,169+5.4%−9.1 pts

09Northampton County, PAPA324,411+5.1%−3.0 pts

10Philadelphia County, PAPA1,574,281+5.1%+9.4 pts

11York County, PAPA473,197+4.9%−7.5 pts

12Berks County, PAPA440,072+4.2%−6.8 pts

13Franklin County, PAPA160,652+4.2%−2.6 pts

14Bucks County, PAPA647,828+3.4%−7.0 pts

15Delaware County, PAPA580,937+3.2%+2.6 pts

16Centre County, PAPA157,393+2.7%−7.0 pts

17Adams County, PAPA107,594+2.4%−14.2 pts

18Allegheny County, PAPA1,225,035+2.2%+6.3 pts

19Pike County, PAPA62,808+2.0%−63.5 pts

20Luzerne County, PAPA332,126+1.5%+4.2 pts

21Washington County, PAPA210,802+0.7%+1.6 pts

22Lackawanna County, PAPA216,502+0.7%+3.3 pts

23Snyder County, PAPA39,655+0.1%−2.3 pts

24Perry County, PAPA46,806-0.3%−6.2 pts

25Montour County, PAPA17,868-0.7%−3.5 pts

26Carbon County, PAPA65,868-0.8%−4.2 pts

27Monroe County, PAPA167,179-0.9%−45.8 pts

28Mifflin County, PAPA46,127-1.2%−1.8 pts

29Clearfield County, PAPA78,100-1.3%−8.1 pts

30Beaver County, PAPA166,032-1.4%+1.2 pts

31Jefferson County, PAPA43,255-1.6%−1.2 pts

32Lycoming County, PAPA112,587-1.7%−2.8 pts

33Fulton County, PAPA14,483-1.9%−5.0 pts

34Tioga County, PAPA40,502-2.2%−2.8 pts

35Westmoreland County, PAPA349,324-2.9%−2.8 pts

36Elk County, PAPA29,926-3.0%−3.7 pts

37Northumberland County, PAPA89,920-3.0%−0.8 pts

38Wayne County, PAPA51,703-3.2%−22.6 pts

39Blair County, PAPA119,541-3.4%−2.3 pts

40Erie County, PAPA265,832-3.5%−5.4 pts

41Schuylkill County, PAPA145,085-3.5%−2.1 pts

42Columbia County, PAPA66,193-3.8%−5.3 pts

43Huntingdon County, PAPA43,001-4.0%−7.2 pts

44Bradford County, PAPA59,600-4.2%−7.2 pts

45Bedford County, PAPA47,480-4.4%−8.7 pts

46Clinton County, PAPA37,870-4.6%−6.5 pts

47Juniata County, PAPA23,403-4.6%−15.2 pts

48Somerset County, PAPA72,004-4.6%−7.0 pts

49Armstrong County, PAPA63,698-4.9%−3.4 pts

50Union County, PAPA42,313-5.0%−20.1 pts

51Mercer County, PAPA107,860-5.1%−4.5 pts

52Crawford County, PAPA81,792-5.4%−10.3 pts

53Lawrence County, PAPA83,911-5.5%−3.9 pts

54Fayette County, PAPA123,021-5.7%−8.0 pts

55Potter County, PAPA15,897-6.1%−14.2 pts

56Indiana County, PAPA82,878-6.3%−5.9 pts

57Clarion County, PAPA36,680-6.9%−7.0 pts

58McKean County, PAPA38,984-6.9%−4.4 pts

59Greene County, PAPA33,885-7.1%−9.9 pts

60Cambria County, PAPA128,968-7.1%−0.7 pts

61Warren County, PAPA37,038-7.7%−5.1 pts

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

63Venango County, PAPA49,346-8.2%−5.2 pts

64Sullivan County, PAPA5,856-9.1%−16.6 pts

65Forest County, PAPA6,614-9.6%−12.6 pts

66Cameron County, PAPA4,211-10.6%−11.6 pts

67Susquehanna County, PAPA38,237-11.4%−16.0 pts

SHOWING 1–67 OF 67

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