RANKING · 2020 CENSUS · 67 SHOWN OF 67

Most sparsely populated, Pennsylvania counties · 2020

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, PAPA4,21111−24%

02Sullivan County, PAPA5,85613−11%

03Potter County, PAPA15,89715−9%

04Forest County, PAPA6,61416+41%

05Fulton County, PAPA14,48333+2%

06Tioga County, PAPA40,50236−1%

07Elk County, PAPA29,92637−12%

08McKean County, PAPA38,98441−12%

09Clinton County, PAPA37,87042−1%

10Warren County, PAPA37,03844−12%

11Susquehanna County, PAPA38,23747−9%

12Bedford County, PAPA47,48047−5%

13Huntingdon County, PAPA43,00150−3%

14Bradford County, PAPA59,60052−4%

15Juniata County, PAPA23,40360+3%

16Clarion County, PAPA36,68062−11%

17Greene County, PAPA33,88562−12%

18Wyoming County, PAPA25,79066−7%

19Jefferson County, PAPA43,25568−3%

20Somerset County, PAPA72,00469−7%

21Clearfield County, PAPA78,10070−3%

22Wayne County, PAPA51,70370+7%

23Venango County, PAPA49,34675−12%

24Crawford County, PAPA81,79283−7%

25Perry County, PAPA46,80683+5%

26Lycoming County, PAPA112,58793−5%

27Armstrong County, PAPA63,698100−9%

28Indiana County, PAPA82,878101−7%

29Pike County, PAPA62,808107+26%

30Mifflin County, PAPA46,127112−1%

31Snyder County, PAPA39,655121+6%

32Columbia County, PAPA66,193134+1%

33Union County, PAPA42,313135+3%

34Montour County, PAPA17,868139−1%

35Centre County, PAPA157,393143+17%

36Fayette County, PAPA123,021163−13%

37Mercer County, PAPA107,860165−8%

38Carbon County, PAPA65,868170+10%

39Schuylkill County, PAPA145,085184−5%

40Cambria County, PAPA128,968194−13%

41Adams County, PAPA107,594200+14%

42Northumberland County, PAPA89,920200−3%

43Franklin County, PAPA160,652202+21%

44Blair County, PAPA119,541234−5%

45Lawrence County, PAPA83,911241−9%

46Washington County, PAPA210,802244+3%

47Butler County, PAPA200,169245+11%

48Monroe County, PAPA167,179277+21%

49Erie County, PAPA265,832339−4%

50Westmoreland County, PAPA349,324345−4%

51Luzerne County, PAPA332,126366+2%

52Beaver County, PAPA166,032387−7%

53Lebanon County, PAPA146,380396+19%

54Lackawanna County, PAPA216,502470+1%

55Cumberland County, PAPA277,270476+21%

56Berks County, PAPA440,072501+15%

57York County, PAPA473,197505+20%

58Dauphin County, PAPA293,351546+14%

59Lancaster County, PAPA563,159586+17%

60Chester County, PAPA557,116712+23%

61Northampton County, PAPA324,411846+17%

62Bucks County, PAPA647,8281,070+8%

63Lehigh County, PAPA384,3831,085+20%

64Allegheny County, PAPA1,225,0351,713−2%

65Montgomery County, PAPA877,6431,774+14%

66Delaware County, PAPA580,9373,138+5%

67Philadelphia County, PAPA1,574,28111,937+6%

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