RANKING · 2010 CENSUS · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties · 2010

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, PAPA1,574,28111,358+1%

02Delaware County, PAPA580,9373,041+1%

03Allegheny County, PAPA1,225,0351,676−5%

04Montgomery County, PAPA877,6431,656+7%

05Bucks County, PAPA647,8281,035+5%

06Lehigh County, PAPA384,3831,012+12%

07Northampton County, PAPA324,411805+11%

08Chester County, PAPA557,116665+15%

09Lancaster County, PAPA563,159550+10%

10Dauphin County, PAPA293,351511+6%

11York County, PAPA473,197481+14%

12Berks County, PAPA440,072480+10%

13Lackawanna County, PAPA216,502467+1%

14Cumberland County, PAPA277,270432+10%

15Beaver County, PAPA166,032392−6%

16Lebanon County, PAPA146,380369+11%

17Luzerne County, PAPA332,126361+1%

18Westmoreland County, PAPA349,324355−1%

19Erie County, PAPA265,832351−0%

20Monroe County, PAPA167,179279+22%

21Lawrence County, PAPA83,911255−4%

22Washington County, PAPA210,802242+2%

23Blair County, PAPA119,541242−2%

24Butler County, PAPA200,169233+6%

25Cambria County, PAPA128,968209−6%

26Northumberland County, PAPA89,920207−0%

27Adams County, PAPA107,594196+11%

28Franklin County, PAPA160,652194+16%

29Schuylkill County, PAPA145,085190−1%

30Mercer County, PAPA107,860173−3%

31Fayette County, PAPA123,021173−8%

32Carbon County, PAPA65,868171+11%

33Union County, PAPA42,313142+8%

34Montour County, PAPA17,868140+0%

35Columbia County, PAPA66,193139+5%

36Centre County, PAPA157,393139+13%

37Snyder County, PAPA39,655121+6%

38Mifflin County, PAPA46,127114+0%

39Indiana County, PAPA82,878107−1%

40Armstrong County, PAPA63,698106−5%

41Pike County, PAPA62,808105+24%

42Lycoming County, PAPA112,58794−3%

43Crawford County, PAPA81,79288−2%

44Perry County, PAPA46,80683+5%

45Venango County, PAPA49,34682−4%

46Wayne County, PAPA51,70373+11%

47Somerset County, PAPA72,00472−3%

48Clearfield County, PAPA78,10071−2%

49Wyoming County, PAPA25,79071+1%

50Jefferson County, PAPA43,25569−2%

51Greene County, PAPA33,88567−5%

52Clarion County, PAPA36,68067−4%

53Juniata County, PAPA23,40363+8%

54Bradford County, PAPA59,60055−0%

55Susquehanna County, PAPA38,23753+3%

56Huntingdon County, PAPA43,00152+1%

57Bedford County, PAPA47,48049−0%

58Warren County, PAPA37,03847−5%

59McKean County, PAPA38,98444−5%

60Clinton County, PAPA37,87044+3%

61Elk County, PAPA29,92639−9%

62Tioga County, PAPA40,50237+1%

63Fulton County, PAPA14,48334+4%

64Forest County, PAPA6,61418+56%

65Potter County, PAPA15,89716−3%

66Sullivan County, PAPA5,85614−2%

67Cameron County, PAPA4,21113−15%

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