RANKING · 2000 CENSUS · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties · 2000

Pennsylvania counties ranked by residents per square mile (2023). This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide.

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YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Philadelphia County, PAPA1,574,28111,295+0%

02Delaware County, PAPA580,9372,997+0%

03Allegheny County, PAPA1,225,0351,756+0%

04Montgomery County, PAPA877,6431,553+0%

05Bucks County, PAPA647,828989+0%

06Lehigh County, PAPA384,383904+0%

07Northampton County, PAPA324,411722+0%

08Chester County, PAPA557,116578+0%

09Lancaster County, PAPA563,159499+0%

10Dauphin County, PAPA293,351480+0%

11Lackawanna County, PAPA216,502465+0%

12Berks County, PAPA440,072436+0%

13York County, PAPA473,197422+0%

14Beaver County, PAPA166,032417+0%

15Cumberland County, PAPA277,270392+0%

16Westmoreland County, PAPA349,324360+0%

17Luzerne County, PAPA332,126359+0%

18Erie County, PAPA265,832352+0%

19Lebanon County, PAPA146,380333+0%

20Lawrence County, PAPA83,911265+0%

21Blair County, PAPA119,541246+0%

22Washington County, PAPA210,802237+0%

23Monroe County, PAPA167,179228+0%

24Cambria County, PAPA128,968222+0%

25Butler County, PAPA200,169221+0%

26Northumberland County, PAPA89,920207+0%

27Schuylkill County, PAPA145,085193+0%

28Fayette County, PAPA123,021188+0%

29Mercer County, PAPA107,860179+0%

30Adams County, PAPA107,594176+0%

31Franklin County, PAPA160,652167+0%

32Carbon County, PAPA65,868154+0%

33Montour County, PAPA17,868140+0%

34Columbia County, PAPA66,193133+0%

35Union County, PAPA42,313132+0%

36Centre County, PAPA157,393123+0%

37Snyder County, PAPA39,655114+0%

38Mifflin County, PAPA46,127113+0%

39Armstrong County, PAPA63,698111+0%

40Indiana County, PAPA82,878108+0%

41Lycoming County, PAPA112,58798+0%

42Crawford County, PAPA81,79289+0%

43Venango County, PAPA49,34685+0%

44Pike County, PAPA62,80885+0%

45Perry County, PAPA46,80679+0%

46Somerset County, PAPA72,00474+0%

47Clearfield County, PAPA78,10073+0%

48Wyoming County, PAPA25,79071+0%

49Greene County, PAPA33,88571+0%

50Jefferson County, PAPA43,25570+0%

51Clarion County, PAPA36,68070+0%

52Wayne County, PAPA51,70366+0%

53Juniata County, PAPA23,40358+0%

54Bradford County, PAPA59,60055+0%

55Huntingdon County, PAPA43,00152+0%

56Susquehanna County, PAPA38,23751+0%

57Warren County, PAPA37,03850+0%

58Bedford County, PAPA47,48049+0%

59McKean County, PAPA38,98447+0%

60Clinton County, PAPA37,87043+0%

61Elk County, PAPA29,92642+0%

62Tioga County, PAPA40,50236+0%

63Fulton County, PAPA14,48333+0%

64Potter County, PAPA15,89717+0%

65Cameron County, PAPA4,21115+0%

66Sullivan County, PAPA5,85615+0%

67Forest County, PAPA6,61412+0%

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES