RANKING · 1990 CENSUS · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties · 1990

Pennsylvania counties ranked by residents per square mile (1990). This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide. The median across all 67 is 131.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Philadelphia County, PAPA1,574,28111,801–

02Delaware County, PAPA580,9372,979–

03Allegheny County, PAPA1,225,0351,831–

04Montgomery County, PAPA877,6431,404–

05Bucks County, PAPA647,828895–

06Lehigh County, PAPA384,383843–

07Northampton County, PAPA324,411668–

08Chester County, PAPA557,116501–

09Lackawanna County, PAPA216,502477–

10Dauphin County, PAPA293,351453–

11Lancaster County, PAPA563,159448–

12Beaver County, PAPA166,032428–

13Berks County, PAPA440,072393–

14York County, PAPA473,197375–

15Luzerne County, PAPA332,126369–

16Westmoreland County, PAPA349,324360–

17Cumberland County, PAPA277,270358–

18Erie County, PAPA265,832345–

19Lebanon County, PAPA146,380314–

20Lawrence County, PAPA83,911269–

21Blair County, PAPA119,541249–

22Washington County, PAPA210,802239–

23Cambria County, PAPA128,968237–

24Northumberland County, PAPA89,920211–

25Schuylkill County, PAPA145,085196–

26Butler County, PAPA200,169193–

27Fayette County, PAPA123,021184–

28Mercer County, PAPA107,860180–

29Monroe County, PAPA167,179157–

30Franklin County, PAPA160,652157–

31Adams County, PAPA107,594151–

32Carbon County, PAPA65,868149–

33Montour County, PAPA17,868136–

34Columbia County, PAPA66,193131–

35Union County, PAPA42,313114–

36Armstrong County, PAPA63,698112–

37Mifflin County, PAPA46,127112–

38Centre County, PAPA157,393112–

39Snyder County, PAPA39,655112–

40Indiana County, PAPA82,878109–

41Lycoming County, PAPA112,58797–

42Venango County, PAPA49,34688–

43Crawford County, PAPA81,79285–

44Perry County, PAPA46,80675–

45Somerset County, PAPA72,00473–

46Wyoming County, PAPA25,79071–

47Jefferson County, PAPA43,25571–

48Clarion County, PAPA36,68069–

49Greene County, PAPA33,88569–

50Clearfield County, PAPA78,10068–

51Wayne County, PAPA51,70355–

52Bradford County, PAPA59,60053–

53Juniata County, PAPA23,40353–

54Pike County, PAPA62,80851–

55Warren County, PAPA37,03851–

56Huntingdon County, PAPA43,00150–

57Susquehanna County, PAPA38,23749–

58McKean County, PAPA38,98448–

59Bedford County, PAPA47,48047–

60Elk County, PAPA29,92642–

61Clinton County, PAPA37,87042–

62Tioga County, PAPA40,50236–

63Fulton County, PAPA14,48332–

64Potter County, PAPA15,89715–

65Cameron County, PAPA4,21115–

66Sullivan County, PAPA5,85614–

67Forest County, PAPA6,61411–

SHOWING 1–67 OF 67

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