RANKING · 2010 CENSUS · 67 SHOWN OF 67

Most sparsely populated, Pennsylvania counties · 2010

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, PAPA4,21113−15%

02Sullivan County, PAPA5,85614−2%

03Potter County, PAPA15,89716−3%

04Forest County, PAPA6,61418+56%

05Fulton County, PAPA14,48334+4%

06Tioga County, PAPA40,50237+1%

07Elk County, PAPA29,92639−9%

08Clinton County, PAPA37,87044+3%

09McKean County, PAPA38,98444−5%

10Warren County, PAPA37,03847−5%

11Bedford County, PAPA47,48049−0%

12Huntingdon County, PAPA43,00152+1%

13Susquehanna County, PAPA38,23753+3%

14Bradford County, PAPA59,60055−0%

15Juniata County, PAPA23,40363+8%

16Clarion County, PAPA36,68067−4%

17Greene County, PAPA33,88567−5%

18Jefferson County, PAPA43,25569−2%

19Wyoming County, PAPA25,79071+1%

20Clearfield County, PAPA78,10071−2%

21Somerset County, PAPA72,00472−3%

22Wayne County, PAPA51,70373+11%

23Venango County, PAPA49,34682−4%

24Perry County, PAPA46,80683+5%

25Crawford County, PAPA81,79288−2%

26Lycoming County, PAPA112,58794−3%

27Pike County, PAPA62,808105+24%

28Armstrong County, PAPA63,698106−5%

29Indiana County, PAPA82,878107−1%

30Mifflin County, PAPA46,127114+0%

31Snyder County, PAPA39,655121+6%

32Centre County, PAPA157,393139+13%

33Columbia County, PAPA66,193139+5%

34Montour County, PAPA17,868140+0%

35Union County, PAPA42,313142+8%

36Carbon County, PAPA65,868171+11%

37Fayette County, PAPA123,021173−8%

38Mercer County, PAPA107,860173−3%

39Schuylkill County, PAPA145,085190−1%

40Franklin County, PAPA160,652194+16%

41Adams County, PAPA107,594196+11%

42Northumberland County, PAPA89,920207−0%

43Cambria County, PAPA128,968209−6%

44Butler County, PAPA200,169233+6%

45Blair County, PAPA119,541242−2%

46Washington County, PAPA210,802242+2%

47Lawrence County, PAPA83,911255−4%

48Monroe County, PAPA167,179279+22%

49Erie County, PAPA265,832351−0%

50Westmoreland County, PAPA349,324355−1%

51Luzerne County, PAPA332,126361+1%

52Lebanon County, PAPA146,380369+11%

53Beaver County, PAPA166,032392−6%

54Cumberland County, PAPA277,270432+10%

55Lackawanna County, PAPA216,502467+1%

56Berks County, PAPA440,072480+10%

57York County, PAPA473,197481+14%

58Dauphin County, PAPA293,351511+6%

59Lancaster County, PAPA563,159550+10%

60Chester County, PAPA557,116665+15%

61Northampton County, PAPA324,411805+11%

62Lehigh County, PAPA384,3831,012+12%

63Bucks County, PAPA647,8281,035+5%

64Montgomery County, PAPA877,6431,656+7%

65Allegheny County, PAPA1,225,0351,676−5%

66Delaware County, PAPA580,9373,041+1%

67Philadelphia County, PAPA1,574,28111,358+1%

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