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%+1768%

02Pike County, PAPA62,808+23.9%−64%

03Monroe County, PAPA167,179+22.5%−50%

04Franklin County, PAPA160,652+15.7%+131%

05Chester County, PAPA557,116+15.1%−1%

06York County, PAPA473,197+13.9%+12%

07Centre County, PAPA157,393+13.4%+39%

08Lehigh County, PAPA384,383+12.0%+66%

09Northampton County, PAPA324,411+11.5%+42%

10Adams County, PAPA107,594+11.1%−33%

11Lebanon County, PAPA146,380+11.0%+90%

12Carbon County, PAPA65,868+11.0%+219%

13Wayne County, PAPA51,703+10.7%−45%

14Lancaster County, PAPA563,159+10.4%−8%

15Cumberland County, PAPA277,270+10.2%+8%

16Berks County, PAPA440,072+10.1%−8%

17Union County, PAPA42,313+8.0%−47%

18Juniata County, PAPA23,403+8.0%−25%

19Montgomery County, PAPA877,643+6.6%−37%

20Dauphin County, PAPA293,351+6.5%+10%

21Snyder County, PAPA39,655+5.7%+143%

22Butler County, PAPA200,169+5.6%−61%

23Perry County, PAPA46,806+5.4%−8%

24Columbia County, PAPA66,193+4.9%+226%

25Bucks County, PAPA647,828+4.6%−56%

26Fulton County, PAPA14,483+4.1%+34%

27Clinton County, PAPA37,870+3.5%+77%

28Susquehanna County, PAPA38,237+2.6%−42%

29Washington County, PAPA210,802+2.4%−394%

30Delaware County, PAPA580,937+1.5%+151%

31Tioga County, PAPA40,502+1.5%+145%

32Huntingdon County, PAPA43,001+0.7%−78%

33Wyoming County, PAPA25,790+0.7%+4799%

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

35Lackawanna County, PAPA216,502+0.5%−120%

36Luzerne County, PAPA332,126+0.5%−119%

37Mifflin County, PAPA46,127+0.4%−33%

38Montour County, PAPA17,868+0.2%−94%

39Northumberland County, PAPA89,920-0.0%−99%

40Erie County, PAPA265,832-0.1%−105%

41Bradford County, PAPA59,600-0.2%−108%

42Bedford County, PAPA47,480-0.4%−110%

43Indiana County, PAPA82,878-0.8%+87%

44Westmoreland County, PAPA349,324-1.3%+1372%

45Schuylkill County, PAPA145,085-1.4%−8%

46Blair County, PAPA119,541-1.6%+49%

47Jefferson County, PAPA43,255-1.6%+386%

48Crawford County, PAPA81,792-1.8%−136%

49Sullivan County, PAPA5,856-2.0%−126%

50Clearfield County, PAPA78,100-2.1%−131%

51Somerset County, PAPA72,004-2.9%−224%

52Mercer County, PAPA107,860-3.0%+418%

53Lycoming County, PAPA112,587-3.3%−392%

54Potter County, PAPA15,897-3.4%−142%

55Lawrence County, PAPA83,911-3.7%+124%

56Clarion County, PAPA36,680-4.3%−2788%

57Venango County, PAPA49,346-4.5%+47%

58Allegheny County, PAPA1,225,035-4.6%+11%

59Warren County, PAPA37,038-4.7%+77%

60Armstrong County, PAPA63,698-4.8%+223%

61Greene County, PAPA33,885-4.9%−272%

62McKean County, PAPA38,984-5.4%+113%

63Cambria County, PAPA128,968-5.8%−9%

64Beaver County, PAPA166,032-6.0%+138%

65Fayette County, PAPA123,021-8.1%−457%

66Elk County, PAPA29,926-9.0%−1444%

67Cameron County, PAPA4,211-14.9%−1542%

SHOWING 1–67 OF 67

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