Population of Counties in Pennsylvania (2018)

Name 2018 Population Growth Rate
Philadelphia County1,574,7653.04%
Allegheny County1,227,5530.30%
Montgomery County820,6562.46%
Bucks County626,7510.21%
Delaware County563,9950.91%
Lancaster County539,1373.62%
Chester County516,4893.31%
York County443,8091.93%
Berks County415,7320.91%
Lehigh County363,1133.70%
Westmoreland County354,788-2.83%
Luzerne County316,801-1.31%
Northampton County301,7601.28%
Erie County276,321-1.59%
Dauphin County274,1212.20%
Cumberland County247,9015.09%
Lackawanna County210,872-1.71%
Washington County207,341-0.28%
Butler County186,2071.15%
Beaver County167,123-2.07%
Monroe County166,516-1.98%
Centre County162,0835.06%
Franklin County153,5642.42%
Schuylkill County143,335-3.33%
Lebanon County138,5573.69%
Cambria County134,313-6.37%
Fayette County132,392-2.97%
Blair County123,927-2.44%
Lycoming County114,708-1.29%
Mercer County112,673-3.38%
Adams County101,6840.22%
Northumberland County92,479-1.96%
Lawrence County87,631-3.68%
Crawford County86,505-2.40%
Indiana County85,256-4.07%
Clearfield County80,035-1.82%
Somerset County75,070-3.49%
Columbia County66,152-1.78%
Armstrong County66,132-3.96%
Carbon County63,515-2.66%
Bradford County60,986-2.77%
Pike County55,191-3.85%
Venango County52,469-4.55%
Wayne County51,230-3.00%
Bedford County48,652-2.09%
Mifflin County46,316-0.68%
Perry County45,9860.01%
Huntingdon County45,503-1.14%
Union County45,4401.00%
Jefferson County43,955-2.67%
McKean County41,518-4.19%
Susquehanna County41,238-4.93%
Tioga County41,227-1.77%
Snyder County40,6672.44%
Warren County39,998-4.25%
Clinton County38,985-0.66%
Clarion County38,558-3.43%
Greene County37,158-3.73%
Elk County30,423-4.47%
Wyoming County27,498-2.59%
Juniata County24,475-0.60%
Montour County18,230-0.42%
Potter County16,925-3.08%
Fulton County14,617-1.73%
Forest County7,306-5.25%
Sullivan County6,089-4.92%
Cameron County4,683-7.69%