RANKING · 2025 ESTIMATES · 67 SHOWN OF 67

Most densely populated, Pennsylvania counties

Pennsylvania counties ranked by residents per square mile (2025). This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide. The median across all 67 is 137.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Philadelphia County, PAPA1,574,28111,717+4%

02Delaware County, PAPA580,9373,161+5%

03Montgomery County, PAPA877,6431,817+17%

04Allegheny County, PAPA1,225,0351,678−4%

05Lehigh County, PAPA384,3831,113+23%

06Bucks County, PAPA647,8281,072+8%

07Northampton County, PAPA324,411877+21%

08Chester County, PAPA557,116742+29%

09Lancaster County, PAPA563,159597+20%

10Dauphin County, PAPA293,351559+17%

11York County, PAPA473,197523+24%

12Berks County, PAPA440,072514+18%

13Cumberland County, PAPA277,270508+30%

14Lackawanna County, PAPA216,502472+2%

15Lebanon County, PAPA146,380405+22%

16Beaver County, PAPA166,032382−8%

17Luzerne County, PAPA332,126373+4%

18Westmoreland County, PAPA349,324340−6%

19Erie County, PAPA265,832333−5%

20Monroe County, PAPA167,179275+21%

21Butler County, PAPA200,169254+15%

22Washington County, PAPA210,802246+4%

23Lawrence County, PAPA83,911235−11%

24Blair County, PAPA119,541228−7%

25Franklin County, PAPA160,652208+24%

26▲1Adams County, PAPA107,594207+18%

27▼1Northumberland County, PAPA89,920196−5%

28Cambria County, PAPA128,968187−15%

29Schuylkill County, PAPA145,085186−3%

30Carbon County, PAPA65,868173+12%

31Mercer County, PAPA107,860160−10%

32Fayette County, PAPA123,021156−17%

33Centre County, PAPA157,393142+16%

34Montour County, PAPA17,868137−2%

35▲1Columbia County, PAPA66,193137+3%

36▼1Union County, PAPA42,313134+2%

37Snyder County, PAPA39,655121+6%

38▲1Pike County, PAPA62,808115+36%

39▼1Mifflin County, PAPA46,127112−1%

40Indiana County, PAPA82,878100−8%

41Armstrong County, PAPA63,69897−12%

42Lycoming County, PAPA112,58792−6%

43Perry County, PAPA46,80685+7%

44Crawford County, PAPA81,79281−9%

45Venango County, PAPA49,34673−14%

46Wayne County, PAPA51,70371+8%

47Clearfield County, PAPA78,10068−6%

48Somerset County, PAPA72,00467−10%

49Jefferson County, PAPA43,25566−6%

50Wyoming County, PAPA25,79065−8%

51▲1Clarion County, PAPA36,68061−12%

52▲1Juniata County, PAPA23,40360+3%

53▼2Greene County, PAPA33,88559−17%

54Bradford County, PAPA59,60052−5%

55Huntingdon County, PAPA43,00149−6%

56Bedford County, PAPA47,48047−5%

57Susquehanna County, PAPA38,23746−9%

58▲1Clinton County, PAPA37,870430%

59▼1Warren County, PAPA37,03842−16%

60McKean County, PAPA38,98440−15%

61Elk County, PAPA29,92636−15%

62Tioga County, PAPA40,50236−2%

63Fulton County, PAPA14,48333+2%

64Forest County, PAPA6,61415+34%

65Potter County, PAPA15,89715−12%

66Sullivan County, PAPA5,85613−11%

67Cameron County, PAPA4,21111−30%

SHOWING 1–67 OF 67

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES