RANKING · 2010 CENSUS · 67 SHOWN OF 67

Most sparsely populated, Pennsylvania counties · 2010

Pennsylvania counties with the fewest residents per square mile (2010). This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide. The median across all 67 is 140.

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SAME RANKING BYCities States Metros

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, PAPA47,480490%

12Huntingdon County, PAPA43,00152+1%

13Susquehanna County, PAPA38,23753+3%

14Bradford County, PAPA59,600550%

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, PAPA46,1271140%

31Snyder County, PAPA39,655121+6%

32Centre County, PAPA157,393139+13%

33Columbia County, PAPA66,193139+5%

34Montour County, PAPA17,8681400%

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, PAPA89,9202070%

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, PAPA265,8323510%

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 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS