RANKING · 2020 CENSUS · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties · 2020

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, PAPA1,574,28111,937+6%

02Delaware County, PAPA580,9373,138+5%

03Montgomery County, PAPA877,6431,774+14%

04Allegheny County, PAPA1,225,0351,713−2%

05Lehigh County, PAPA384,3831,085+20%

06Bucks County, PAPA647,8281,070+8%

07Northampton County, PAPA324,411846+17%

08Chester County, PAPA557,116712+23%

09Lancaster County, PAPA563,159586+17%

10Dauphin County, PAPA293,351546+14%

11York County, PAPA473,197505+20%

12Berks County, PAPA440,072501+15%

13Cumberland County, PAPA277,270476+21%

14Lackawanna County, PAPA216,502470+1%

15Lebanon County, PAPA146,380396+19%

16Beaver County, PAPA166,032387−7%

17Luzerne County, PAPA332,126366+2%

18Westmoreland County, PAPA349,324345−4%

19Erie County, PAPA265,832339−4%

20Monroe County, PAPA167,179277+21%

21Butler County, PAPA200,169245+11%

22Washington County, PAPA210,802244+3%

23Lawrence County, PAPA83,911241−9%

24Blair County, PAPA119,541234−5%

25Franklin County, PAPA160,652202+21%

26Northumberland County, PAPA89,920200−3%

27Adams County, PAPA107,594200+14%

28Cambria County, PAPA128,968194−13%

29Schuylkill County, PAPA145,085184−5%

30Carbon County, PAPA65,868170+10%

31Mercer County, PAPA107,860165−8%

32Fayette County, PAPA123,021163−13%

33Centre County, PAPA157,393143+17%

34Montour County, PAPA17,868139−1%

35Union County, PAPA42,313135+3%

36Columbia County, PAPA66,193134+1%

37Snyder County, PAPA39,655121+6%

38Mifflin County, PAPA46,127112−1%

39Pike County, PAPA62,808107+26%

40Indiana County, PAPA82,878101−7%

41Armstrong County, PAPA63,698100−9%

42Lycoming County, PAPA112,58793−5%

43Perry County, PAPA46,80683+5%

44Crawford County, PAPA81,79283−7%

45Venango County, PAPA49,34675−12%

46Wayne County, PAPA51,70370+7%

47Clearfield County, PAPA78,10070−3%

48Somerset County, PAPA72,00469−7%

49Jefferson County, PAPA43,25568−3%

50Wyoming County, PAPA25,79066−7%

51Greene County, PAPA33,88562−12%

52Clarion County, PAPA36,68062−11%

53Juniata County, PAPA23,40360+3%

54Bradford County, PAPA59,60052−4%

55Huntingdon County, PAPA43,00150−3%

56Bedford County, PAPA47,48047−5%

57Susquehanna County, PAPA38,23747−9%

58Warren County, PAPA37,03844−12%

59Clinton County, PAPA37,87042−1%

60McKean County, PAPA38,98441−12%

61Elk County, PAPA29,92637−12%

62Tioga County, PAPA40,50236−1%

63Fulton County, PAPA14,48333+2%

64Forest County, PAPA6,61416+41%

65Potter County, PAPA15,89715−9%

66Sullivan County, PAPA5,85613−11%

67Cameron County, PAPA4,21111−24%

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