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Most sparsely populated, Pennsylvania counties

Pennsylvania counties with the fewest 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

01Cameron County, PAPA4,21111−30%

02Sullivan County, PAPA5,85613−11%

03Potter County, PAPA15,89715−12%

04Forest County, PAPA6,61415+34%

05Fulton County, PAPA14,48333+2%

06Tioga County, PAPA40,50236−2%

07Elk County, PAPA29,92636−15%

08McKean County, PAPA38,98440−15%

09Warren County, PAPA37,03842−16%

10Clinton County, PAPA37,87043−0%

11Susquehanna County, PAPA38,23746−9%

12Bedford County, PAPA47,48047−5%

13Huntingdon County, PAPA43,00149−6%

14Bradford County, PAPA59,60052−5%

15Greene County, PAPA33,88559−17%

16Juniata County, PAPA23,40360+3%

17Clarion County, PAPA36,68061−12%

18Wyoming County, PAPA25,79065−8%

19Jefferson County, PAPA43,25566−6%

20Somerset County, PAPA72,00467−10%

21Clearfield County, PAPA78,10068−6%

22Wayne County, PAPA51,70371+8%

23Venango County, PAPA49,34673−14%

24Crawford County, PAPA81,79281−9%

25Perry County, PAPA46,80685+7%

26Lycoming County, PAPA112,58792−6%

27Armstrong County, PAPA63,69897−12%

28Indiana County, PAPA82,878100−8%

29Mifflin County, PAPA46,127112−1%

30Pike County, PAPA62,808115+36%

31Snyder County, PAPA39,655121+6%

32Union County, PAPA42,313134+2%

33Columbia County, PAPA66,193137+3%

34Montour County, PAPA17,868137−2%

35Centre County, PAPA157,393142+16%

36Fayette County, PAPA123,021156−17%

37Mercer County, PAPA107,860160−10%

38Carbon County, PAPA65,868173+12%

39Schuylkill County, PAPA145,085186−3%

40Cambria County, PAPA128,968187−15%

41Northumberland County, PAPA89,920196−5%

42Adams County, PAPA107,594207+18%

43Franklin County, PAPA160,652208+24%

44Blair County, PAPA119,541228−7%

45Lawrence County, PAPA83,911235−11%

46Washington County, PAPA210,802246+4%

47Butler County, PAPA200,169254+15%

48Monroe County, PAPA167,179275+21%

49Erie County, PAPA265,832333−5%

50Westmoreland County, PAPA349,324340−6%

51Luzerne County, PAPA332,126373+4%

52Beaver County, PAPA166,032382−8%

53Lebanon County, PAPA146,380405+22%

54Lackawanna County, PAPA216,502472+2%

55Cumberland County, PAPA277,270508+30%

56Berks County, PAPA440,072514+18%

57York County, PAPA473,197523+24%

58Dauphin County, PAPA293,351559+17%

59Lancaster County, PAPA563,159597+20%

60Chester County, PAPA557,116742+29%

61Northampton County, PAPA324,411877+21%

62Bucks County, PAPA647,8281,072+8%

63Lehigh County, PAPA384,3831,113+23%

64Allegheny County, PAPA1,225,0351,678−4%

65Montgomery County, PAPA877,6431,817+17%

66Delaware County, PAPA580,9373,161+5%

67Philadelphia County, PAPA1,574,28111,717+4%

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