PlainCities

Counties · Pennsylvania

Counties of Pennsylvania

Pennsylvania has 67 counties. Philadelphia County is the largest with 1,574,281 residents in 2025. 26 of the 67 gained residents between 2020 and 2025 by the Census Bureau's estimates.

What counties are in Pennsylvania?

Sorted by the 2025 population estimate; sort by any column.

Counties of Pennsylvania: 2025 estimate, change since 2020, ACS 2020-2024 5-year estimates
Philadelphia County1,574,281−1.8%1408$61,953$243,100
Allegheny County1,225,035−2.0%157394$78,548$227,600
Montgomery County877,643+2.5%110219$113,915$436,700
Bucks County647,828+0.2%75147$114,764$445,700
Delaware County580,937+0.7%67152$89,546$332,200
Lancaster County563,159+1.8%107116$86,959$301,100
Chester County557,116+4.2%104124$127,208$485,600
York County473,197+3.7%91108$84,829$248,600
Berks County440,072+2.6%131107$79,777$257,300
Lehigh County384,383+2.6%4181$80,079$300,400
Westmoreland County349,324−1.5%86113$74,109$203,500
Luzerne County332,126+2.0%103101$63,691$174,100
Northampton County324,411+3.7%5074$89,184$308,600
Dauphin County293,351+2.4%5567$76,242$236,400
Cumberland County277,270+6.9%4355$87,494$277,600
Erie County265,832−1.9%4274$63,354$177,000
Lackawanna County216,502+0.3%4760$66,223$201,800
Washington County210,802+0.7%10362$78,958$228,500
Butler County200,169+3.3%7147$89,843$294,200
Monroe County167,179−0.7%3351$83,565$267,600
Beaver County166,032−1.3%6053$71,089$190,900
Franklin County160,652+3.0%3233$77,003$249,800
Centre County157,393−0.5%7841$74,291$323,500
Lebanon County146,380+2.2%3933$78,425$242,000
Schuylkill County145,085+1.4%11142$68,313$153,000
Cambria County128,968−3.4%8942$58,418$121,000
Fayette County123,021−4.5%6836$58,236$143,200
Blair County119,541−2.7%10938$62,382$161,100
Lycoming County112,587−1.4%5732$63,917$202,200
Mercer County107,860−2.5%5035$59,976$164,000
Adams County107,594+3.6%4727$84,092$268,500
Northumberland County89,920−1.9%5025$60,583$162,400
Lawrence County83,911−2.5%4128$61,931$147,200
Indiana County82,878−0.4%5024$60,208$152,800
Crawford County81,792−2.6%6723$60,476$153,200
Clearfield County78,100−3.1%7520$62,152$137,000
Somerset County72,004−2.9%5724$61,446$150,600
Columbia County66,193+2.3%5816$64,644$206,200
Carbon County65,868+1.7%2917$67,554$211,400
Armstrong County63,698−2.9%5819$65,008$157,300
Pike County62,808+7.3%2725$81,323$272,600
Bradford County59,600−0.6%5515$63,675$187,500
Wayne County51,703+1.1%3617$62,381$242,100
Venango County49,346−2.2%3617$61,522$119,800
Bedford County47,480−0.2%4412$59,992$179,000
Perry County46,806+2.1%3210$79,444$236,400
Mifflin County46,127−0.0%3613$63,953$156,700
Jefferson County43,255−2.8%3513$58,686$139,700
Huntingdon County43,001−2.4%5413$65,557$183,200
Union County42,313−0.9%2111$76,404$240,100
Tioga County40,502−1.3%4410$64,899$181,100
Snyder County39,655−0.2%318$66,876$215,300
McKean County38,984−3.6%2512$62,905$104,500
Susquehanna County38,237−0.5%4612$68,487$216,400
Clinton County37,870+1.1%4310$60,816$175,900
Warren County37,038−4.0%3213$60,480$127,500
Clarion County36,680−1.5%4013$62,649$155,700
Greene County33,885−5.7%4010$68,041$153,900
Elk County29,926−3.4%189$66,380$133,600
Wyoming County25,790−1.1%277$72,460$215,400
Juniata County23,403−0.4%226$66,318$217,000
Montour County17,868−1.5%114$76,976$248,100
Potter County15,897−3.1%337$59,020$153,100
Fulton County14,483−0.5%193$65,836$208,500
Forest County6,614−5.3%102$52,191$115,300
Sullivan County5,856+0.4%154$69,764$197,100
Cameron County4,211−7.3%92$50,573$88,900

Source: PEP Vintage 2025 (CO-EST2025); American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Census population estimates

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections