RANKING · 1990 CENSUS · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties · 1990

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, PAPA1,574,28111,801+4%

02Delaware County, PAPA580,9372,979−1%

03Allegheny County, PAPA1,225,0351,831+4%

04Montgomery County, PAPA877,6431,404−10%

05Bucks County, PAPA647,828895−9%

06Lehigh County, PAPA384,383843−7%

07Northampton County, PAPA324,411668−7%

08Chester County, PAPA557,116501−13%

09Lackawanna County, PAPA216,502477+3%

10Dauphin County, PAPA293,351453−6%

11Lancaster County, PAPA563,159448−10%

12Beaver County, PAPA166,032428+3%

13Berks County, PAPA440,072393−10%

14York County, PAPA473,197375−11%

15Luzerne County, PAPA332,126369+3%

16Westmoreland County, PAPA349,324360+0%

17Cumberland County, PAPA277,270358−9%

18Erie County, PAPA265,832345−2%

19Lebanon County, PAPA146,380314−5%

20Lawrence County, PAPA83,911269+2%

21Blair County, PAPA119,541249+1%

22Washington County, PAPA210,802239+1%

23Cambria County, PAPA128,968237+7%

24Northumberland County, PAPA89,920211+2%

25Schuylkill County, PAPA145,085196+1%

26Butler County, PAPA200,169193−13%

27Fayette County, PAPA123,021184−2%

28Mercer County, PAPA107,860180+1%

29Monroe County, PAPA167,179157−31%

30Franklin County, PAPA160,652157−6%

31Adams County, PAPA107,594151−14%

32Carbon County, PAPA65,868149−3%

33Montour County, PAPA17,868136−3%

34Columbia County, PAPA66,193131−1%

35Union County, PAPA42,313114−13%

36Armstrong County, PAPA63,698112+2%

37Mifflin County, PAPA46,127112−1%

38Centre County, PAPA157,393112−9%

39Snyder County, PAPA39,655112−2%

40Indiana County, PAPA82,878109+0%

41Lycoming County, PAPA112,58797−1%

42Venango County, PAPA49,34688+3%

43Crawford County, PAPA81,79285−5%

44Perry County, PAPA46,80675−6%

45Somerset County, PAPA72,00473−2%

46Wyoming County, PAPA25,79071−0%

47Jefferson County, PAPA43,25571+0%

48Clarion County, PAPA36,68069−0%

49Greene County, PAPA33,88569−3%

50Clearfield County, PAPA78,10068−6%

51Wayne County, PAPA51,70355−16%

52Bradford County, PAPA59,60053−3%

53Juniata County, PAPA23,40353−10%

54Pike County, PAPA62,80851−40%

55Warren County, PAPA37,03851+3%

56Huntingdon County, PAPA43,00150−3%

57Susquehanna County, PAPA38,23749−4%

58McKean County, PAPA38,98448+3%

59Bedford County, PAPA47,48047−4%

60Elk County, PAPA29,92642−1%

61Clinton County, PAPA37,87042−2%

62Tioga County, PAPA40,50236−1%

63Fulton County, PAPA14,48332−3%

64Potter County, PAPA15,89715−8%

65Cameron County, PAPA4,21115−1%

66Sullivan County, PAPA5,85614−7%

67Forest County, PAPA6,61411−3%

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