RANKING · 2025 ESTIMATES · 67 SHOWN OF 67

Fastest growing, Pennsylvania counties

Pennsylvania counties ranked by population growth from the 2020 census to 2025. 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

01Pike County, PAPA62,808+7.3%−89%

02Cumberland County, PAPA277,270+6.9%−27%

03Chester County, PAPA557,116+4.2%−72%

04York County, PAPA473,197+3.7%−70%

05Northampton County, PAPA324,411+3.7%−55%

06Adams County, PAPA107,594+3.6%−78%

07Butler County, PAPA200,169+3.3%−77%

08Franklin County, PAPA160,652+3.0%−55%

09Lehigh County, PAPA384,383+2.6%−64%

10Berks County, PAPA440,072+2.6%−76%

11Montgomery County, PAPA877,643+2.5%−77%

12Dauphin County, PAPA293,351+2.4%−59%

13Columbia County, PAPA66,193+2.3%+51%

14Lebanon County, PAPA146,380+2.2%−62%

15Perry County, PAPA46,806+2.1%−64%

16Luzerne County, PAPA332,126+2.0%−174%

17Lancaster County, PAPA563,159+1.8%−84%

18Carbon County, PAPA65,868+1.7%−50%

19Schuylkill County, PAPA145,085+1.4%−197%

20Clinton County, PAPA37,870+1.1%−43%

21Wayne County, PAPA51,703+1.1%−94%

22Delaware County, PAPA580,937+0.7%+21%

23Washington County, PAPA210,802+0.7%−184%

24Lackawanna County, PAPA216,502+0.3%−111%

25Sullivan County, PAPA5,856+0.3%−96%

26Bucks County, PAPA647,828+0.2%−98%

27Mifflin County, PAPA46,127-0.0%−106%

28Snyder County, PAPA39,655-0.2%−109%

29Bedford County, PAPA47,480-0.2%−105%

30Indiana County, PAPA82,878-0.4%+2%

31Juniata County, PAPA23,403-0.5%−104%

32Centre County, PAPA157,393-0.5%−105%

33Fulton County, PAPA14,483-0.5%−116%

34Susquehanna County, PAPA38,237-0.5%−111%

35Bradford County, PAPA59,600-0.6%−121%

36Monroe County, PAPA167,179-0.7%−102%

37Union County, PAPA42,313-0.9%−106%

38Wyoming County, PAPA25,790-1.1%−7612%

39Beaver County, PAPA166,032-1.3%−48%

40Tioga County, PAPA40,502-1.3%−320%

41Lycoming County, PAPA112,587-1.4%−225%

42Montour County, PAPA17,868-1.5%−152%

43Westmoreland County, PAPA349,324-1.5%+1600%

44Clarion County, PAPA36,680-1.5%−1052%

45Philadelphia County, PAPA1,574,281-1.8%−57%

46Erie County, PAPA265,832-1.9%−197%

47Northumberland County, PAPA89,920-1.9%−18%

48Allegheny County, PAPA1,225,035-2.0%−50%

49Venango County, PAPA49,346-2.2%−28%

50Huntingdon County, PAPA43,001-2.5%−177%

51Lawrence County, PAPA83,911-2.5%+51%

52Mercer County, PAPA107,860-2.5%+330%

53Crawford County, PAPA81,792-2.6%−152%

54Blair County, PAPA119,541-2.7%+149%

55Jefferson County, PAPA43,255-2.8%+748%

56Armstrong County, PAPA63,698-2.8%+92%

57Somerset County, PAPA72,004-2.9%−224%

58Potter County, PAPA15,897-3.0%−137%

59Clearfield County, PAPA78,100-3.1%−145%

60Cambria County, PAPA128,968-3.4%−47%

61Elk County, PAPA29,926-3.4%−612%

62McKean County, PAPA38,984-3.6%+41%

63Warren County, PAPA37,038-4.0%+52%

64Fayette County, PAPA123,021-4.5%−298%

65Forest County, PAPA6,614-5.1%−272%

66Greene County, PAPA33,885-5.8%−303%

67Cameron County, PAPA4,211-7.4%−816%

SHOWING 1–67 OF 67

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES