RANKING · 2000 CENSUS · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties · 2000

Pennsylvania counties ranked by residents per square mile (2000). This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide. The median across all 67 is 133.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 1990

01Philadelphia County, PAPA1,574,28111,295−4%

02Delaware County, PAPA580,9372,997+1%

03Allegheny County, PAPA1,225,0351,756−4%

04Montgomery County, PAPA877,6431,553+11%

05Bucks County, PAPA647,828989+10%

06Lehigh County, PAPA384,383904+7%

07Northampton County, PAPA324,411722+8%

08Chester County, PAPA557,116578+15%

09Lancaster County, PAPA563,159499+11%

10Dauphin County, PAPA293,351480+6%

11Lackawanna County, PAPA216,502465−3%

12Berks County, PAPA440,072436+11%

13York County, PAPA473,197422+12%

14Beaver County, PAPA166,032417−3%

15Cumberland County, PAPA277,270392+9%

16Westmoreland County, PAPA349,3243600%

17Luzerne County, PAPA332,126359−3%

18Erie County, PAPA265,832352+2%

19Lebanon County, PAPA146,380333+6%

20Lawrence County, PAPA83,911265−2%

21Blair County, PAPA119,541246−1%

22Washington County, PAPA210,802237−1%

23Monroe County, PAPA167,179228+45%

24Cambria County, PAPA128,968222−6%

25Butler County, PAPA200,169221+15%

26Northumberland County, PAPA89,920207−2%

27Schuylkill County, PAPA145,085193−1%

28Fayette County, PAPA123,021188+2%

29Mercer County, PAPA107,860179−1%

30Adams County, PAPA107,594176+17%

31Franklin County, PAPA160,652167+7%

32Carbon County, PAPA65,868154+3%

33Montour County, PAPA17,868140+3%

34Columbia County, PAPA66,193133+2%

35Union County, PAPA42,313132+15%

36Centre County, PAPA157,393123+10%

37Snyder County, PAPA39,655114+2%

38Mifflin County, PAPA46,127113+1%

39Armstrong County, PAPA63,698111−1%

40Indiana County, PAPA82,8781080%

41Lycoming County, PAPA112,58798+1%

42Crawford County, PAPA81,79289+5%

43Venango County, PAPA49,34685−3%

44Pike County, PAPA62,80885+66%

45Perry County, PAPA46,80679+6%

46Somerset County, PAPA72,00474+2%

47Clearfield County, PAPA78,10073+7%

48Wyoming County, PAPA25,790710%

49Greene County, PAPA33,88571+3%

50Jefferson County, PAPA43,255700%

51Clarion County, PAPA36,680700%

52Wayne County, PAPA51,70366+19%

53Juniata County, PAPA23,40358+11%

54Bradford County, PAPA59,60055+3%

55Huntingdon County, PAPA43,00152+3%

56Susquehanna County, PAPA38,23751+5%

57Warren County, PAPA37,03850−3%

58Bedford County, PAPA47,48049+4%

59McKean County, PAPA38,98447−3%

60Clinton County, PAPA37,87043+2%

61Elk County, PAPA29,92642+1%

62Tioga County, PAPA40,50236+1%

63Fulton County, PAPA14,48333+3%

64Potter County, PAPA15,89717+8%

65Cameron County, PAPA4,21115+1%

66Sullivan County, PAPA5,85615+7%

67Forest County, PAPA6,61412+3%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS