RANKING · 2025 ESTIMATES · 67 SHOWN OF 67

Most sparsely populated, Pennsylvania counties

Pennsylvania counties with the fewest 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

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%

09▲1Warren County, PAPA37,03842−16%

10▼1Clinton County, PAPA37,870430%

11Susquehanna County, PAPA38,23746−9%

12Bedford County, PAPA47,48047−5%

13Huntingdon County, PAPA43,00149−6%

14Bradford County, PAPA59,60052−5%

15▲2Greene County, PAPA33,88559−17%

16▼1Juniata County, PAPA23,40360+3%

17▼1Clarion 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%

29▲1Mifflin County, PAPA46,127112−1%

30▼1Pike County, PAPA62,808115+36%

31Snyder County, PAPA39,655121+6%

32▲1Union County, PAPA42,313134+2%

33▼1Columbia 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%

41▲1Northumberland County, PAPA89,920196−5%

42▼1Adams 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%

SHOWING 1–67 OF 67

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