RANKING · 2010 CENSUS · 67 SHOWN OF 67

Fastest growing, Pennsylvania counties · 2010

Pennsylvania counties ranked by population growth 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Forest County, PAPA6,614+56.0%+53.0 pts

02Pike County, PAPA62,808+23.9%−41.7 pts

03Monroe County, PAPA167,179+22.5%−22.4 pts

04Franklin County, PAPA160,652+15.7%+8.9 pts

05Chester County, PAPA557,116+15.1%−0.1 pts

06York County, PAPA473,197+13.9%+1.5 pts

07Centre County, PAPA157,393+13.4%+3.8 pts

08Lehigh County, PAPA384,383+12.0%+4.8 pts

09Northampton County, PAPA324,411+11.5%+3.4 pts

10Adams County, PAPA107,594+11.1%−5.6 pts

11Lebanon County, PAPA146,380+11.0%+5.2 pts

12Carbon County, PAPA65,868+11.0%+7.5 pts

13Wayne County, PAPA51,703+10.7%−8.8 pts

14Lancaster County, PAPA563,159+10.4%−0.9 pts

15Cumberland County, PAPA277,270+10.2%+0.7 pts

16Berks County, PAPA440,072+10.1%−0.9 pts

17Union County, PAPA42,313+8.0%−7.1 pts

18Juniata County, PAPA23,403+8.0%−2.7 pts

19Montgomery County, PAPA877,643+6.6%−4.0 pts

20Dauphin County, PAPA293,351+6.5%+0.6 pts

21Snyder County, PAPA39,655+5.7%+3.4 pts

22Butler County, PAPA200,169+5.6%−8.9 pts

23Perry County, PAPA46,806+5.4%−0.5 pts

24Columbia County, PAPA66,193+4.9%+3.4 pts

25Bucks County, PAPA647,828+4.6%−5.8 pts

26Fulton County, PAPA14,483+4.1%+1.0 pts

27Clinton County, PAPA37,870+3.5%+1.5 pts

28Susquehanna County, PAPA38,237+2.6%−2.0 pts

29Washington County, PAPA210,802+2.4%+3.3 pts

30Delaware County, PAPA580,937+1.5%+0.9 pts

31Tioga County, PAPA40,502+1.5%+0.9 pts

32Huntingdon County, PAPA43,001+0.7%−2.5 pts

33Wyoming County, PAPA25,790+0.7%+0.7 pts

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

35Lackawanna County, PAPA216,502+0.5%+3.2 pts

36Luzerne County, PAPA332,126+0.5%+3.2 pts

37Mifflin County, PAPA46,127+0.4%−0.2 pts

38Montour County, PAPA17,868+0.2%−2.7 pts

39Northumberland County, PAPA89,920-0.0%+2.3 pts

40Erie County, PAPA265,832-0.1%−2.0 pts

41Bradford County, PAPA59,600-0.2%−3.2 pts

42Bedford County, PAPA47,480-0.4%−4.8 pts

43Indiana County, PAPA82,878-0.8%−0.4 pts

44Westmoreland County, PAPA349,324-1.3%−1.2 pts

45Schuylkill County, PAPA145,085-1.4%+0.1 pts

46Blair County, PAPA119,541-1.6%−0.5 pts

47Jefferson County, PAPA43,255-1.6%−1.3 pts

48Crawford County, PAPA81,792-1.8%−6.6 pts

49Sullivan County, PAPA5,856-2.0%−9.4 pts

50Clearfield County, PAPA78,100-2.1%−8.9 pts

51Somerset County, PAPA72,004-2.9%−5.2 pts

52Mercer County, PAPA107,860-3.0%−2.5 pts

53Lycoming County, PAPA112,587-3.3%−4.4 pts

54Potter County, PAPA15,897-3.4%−11.6 pts

55Lawrence County, PAPA83,911-3.7%−2.1 pts

56Clarion County, PAPA36,680-4.3%−4.4 pts

57Venango County, PAPA49,346-4.5%−1.4 pts

58Allegheny County, PAPA1,225,035-4.6%−0.5 pts

59Warren County, PAPA37,038-4.7%−2.0 pts

60Armstrong County, PAPA63,698-4.8%−3.3 pts

61Greene County, PAPA33,885-4.9%−7.7 pts

62McKean County, PAPA38,984-5.4%−2.9 pts

63Cambria County, PAPA128,968-5.8%+0.6 pts

64Beaver County, PAPA166,032-6.0%−3.5 pts

65Fayette County, PAPA123,021-8.1%−10.4 pts

66Elk County, PAPA29,926-9.0%−9.7 pts

67Cameron County, PAPA4,211-14.9%−15.9 pts

SHOWING 1–67 OF 67

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