RANKING · 2000 CENSUS · 67 SHOWN OF 67

Largest by population, Pennsylvania counties · 2000

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, PAPA1,574,2811,517,550+0%

02Allegheny County, PAPA1,225,0351,281,666+0%

03Montgomery County, PAPA877,643750,097+0%

04Bucks County, PAPA647,828597,635+0%

05Delaware County, PAPA580,937550,864+0%

06Lancaster County, PAPA563,159470,658+0%

07Chester County, PAPA557,116433,501+0%

08York County, PAPA473,197381,751+0%

09Berks County, PAPA440,072373,638+0%

10Westmoreland County, PAPA349,324369,993+0%

11Luzerne County, PAPA332,126319,250+0%

12Lehigh County, PAPA384,383312,090+0%

13Erie County, PAPA265,832280,843+0%

14Northampton County, PAPA324,411267,066+0%

15Dauphin County, PAPA293,351251,798+0%

16Cumberland County, PAPA277,270213,674+0%

17Lackawanna County, PAPA216,502213,295+0%

18Washington County, PAPA210,802202,897+0%

19Beaver County, PAPA166,032181,412+0%

20Butler County, PAPA200,169174,083+0%

21Cambria County, PAPA128,968152,598+0%

22Schuylkill County, PAPA145,085150,336+0%

23Fayette County, PAPA123,021148,644+0%

24Monroe County, PAPA167,179138,687+0%

25Centre County, PAPA157,393135,758+0%

26Franklin County, PAPA160,652129,313+0%

27Blair County, PAPA119,541129,144+0%

28Lebanon County, PAPA146,380120,327+0%

29Mercer County, PAPA107,860120,293+0%

30Lycoming County, PAPA112,587120,044+0%

31Lawrence County, PAPA83,91194,643+0%

32Northumberland County, PAPA89,92094,556+0%

33Adams County, PAPA107,59491,292+0%

34Crawford County, PAPA81,79290,366+0%

35Indiana County, PAPA82,87889,605+0%

36Clearfield County, PAPA78,10083,382+0%

37Somerset County, PAPA72,00480,023+0%

38Armstrong County, PAPA63,69872,392+0%

39Columbia County, PAPA66,19364,151+0%

40Bradford County, PAPA59,60062,761+0%

41Carbon County, PAPA65,86858,802+0%

42Venango County, PAPA49,34657,565+0%

43Bedford County, PAPA47,48049,984+0%

44Wayne County, PAPA51,70347,722+0%

45Mifflin County, PAPA46,12746,486+0%

46Pike County, PAPA62,80846,302+0%

47McKean County, PAPA38,98445,936+0%

48Jefferson County, PAPA43,25545,932+0%

49Huntingdon County, PAPA43,00145,586+0%

50Warren County, PAPA37,03843,863+0%

51Perry County, PAPA46,80643,602+0%

52Susquehanna County, PAPA38,23742,238+0%

53Clarion County, PAPA36,68041,765+0%

54Union County, PAPA42,31341,624+0%

55Tioga County, PAPA40,50241,373+0%

56Greene County, PAPA33,88540,672+0%

57Clinton County, PAPA37,87037,914+0%

58Snyder County, PAPA39,65537,546+0%

59Elk County, PAPA29,92635,112+0%

60Wyoming County, PAPA25,79028,080+0%

61Juniata County, PAPA23,40322,821+0%

62Montour County, PAPA17,86818,236+0%

63Potter County, PAPA15,89718,080+0%

64Fulton County, PAPA14,48314,261+0%

65Sullivan County, PAPA5,8566,556+0%

66Cameron County, PAPA4,2115,974+0%

67Forest County, PAPA6,6144,946+0%

SHOWING 1–67 OF 67

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