RANKING · 1990 CENSUS · 67 SHOWN OF 67

Largest by population, Pennsylvania counties · 1990

The most populous us counties as of the 2023 estimates. This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPTOTAL POPULATIONVS 2000

01Philadelphia County, PAPA1,574,2811,585,577+4%

02Allegheny County, PAPA1,225,0351,336,449+4%

03Montgomery County, PAPA877,643678,111−10%

04Delaware County, PAPA580,937547,651−1%

05Bucks County, PAPA647,828541,174−9%

06Lancaster County, PAPA563,159422,822−10%

07Chester County, PAPA557,116376,396−13%

08Westmoreland County, PAPA349,324370,321+0%

09York County, PAPA473,197339,574−11%

10Berks County, PAPA440,072336,523−10%

11Luzerne County, PAPA332,126328,149+3%

12Lehigh County, PAPA384,383291,130−7%

13Erie County, PAPA265,832275,572−2%

14Northampton County, PAPA324,411247,105−7%

15Dauphin County, PAPA293,351237,813−6%

16Lackawanna County, PAPA216,502219,039+3%

17Washington County, PAPA210,802204,584+1%

18Cumberland County, PAPA277,270195,257−9%

19Beaver County, PAPA166,032186,093+3%

20Cambria County, PAPA128,968163,029+7%

21Schuylkill County, PAPA145,085152,585+1%

22Butler County, PAPA200,169152,013−13%

23Fayette County, PAPA123,021145,351−2%

24Blair County, PAPA119,541130,542+1%

25Centre County, PAPA157,393123,786−9%

26Franklin County, PAPA160,652121,082−6%

27Mercer County, PAPA107,860121,003+1%

28Lycoming County, PAPA112,587118,710−1%

29Lebanon County, PAPA146,380113,744−5%

30Northumberland County, PAPA89,92096,771+2%

31Lawrence County, PAPA83,91196,246+2%

32Monroe County, PAPA167,17995,709−31%

33Indiana County, PAPA82,87889,994+0%

34Crawford County, PAPA81,79286,169−5%

35Adams County, PAPA107,59478,274−14%

36Somerset County, PAPA72,00478,218−2%

37Clearfield County, PAPA78,10078,097−6%

38Armstrong County, PAPA63,69873,478+2%

39Columbia County, PAPA66,19363,202−1%

40Bradford County, PAPA59,60060,967−3%

41Venango County, PAPA49,34659,381+3%

42Carbon County, PAPA65,86856,846−3%

43Bedford County, PAPA47,48047,919−4%

44McKean County, PAPA38,98447,131+3%

45Mifflin County, PAPA46,12746,197−1%

46Jefferson County, PAPA43,25546,083+0%

47Warren County, PAPA37,03845,050+3%

48Huntingdon County, PAPA43,00144,164−3%

49Clarion County, PAPA36,68041,699−0%

50Perry County, PAPA46,80641,172−6%

51Tioga County, PAPA40,50241,126−1%

52Susquehanna County, PAPA38,23740,380−4%

53Wayne County, PAPA51,70339,944−16%

54Greene County, PAPA33,88539,550−3%

55Clinton County, PAPA37,87037,182−2%

56Snyder County, PAPA39,65536,680−2%

57Union County, PAPA42,31336,176−13%

58Elk County, PAPA29,92634,878−1%

59Wyoming County, PAPA25,79028,076−0%

60Pike County, PAPA62,80827,966−40%

61Juniata County, PAPA23,40320,625−10%

62Montour County, PAPA17,86817,735−3%

63Potter County, PAPA15,89716,717−8%

64Fulton County, PAPA14,48313,837−3%

65Sullivan County, PAPA5,8566,104−7%

66Cameron County, PAPA4,2115,913−1%

67Forest County, PAPA6,6144,802−3%

SHOWING 1–67 OF 67

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