Philadelphia County is the most populous county in the U.S. state of Pennsylvania. As of 2019, Philadelphia County was home to an estimated population of 1,584,064 residents. The county is the second smallest county in Pennsylvania by land area, after Montour County. Philadelphia County is one of the three original counties, along with Chester and Bucks counties, created by William Penn in November 1682. Since 1854, the county has been coextensive with the City of Philadelphia which is also its county seat. Philadelphia County is the core county in the Philadelphia-Camden-Wilmington Combined Statistical Area (PA-NJ-DE-MD, also known as the Delaware Valley), located along the lower Delaware and Schuylkill Rivers, within the Northeast megalopolis. Philadelphia County is the economic and cultural anchor of the Delaware Valley, the ninth-largest combined statistical area in the United States with an estimated population of 7.2 million.
History When established, Philadelphia County consisted mainly of the area from the Delaware River west between the Schuylkill River to the south and the border with Bucks County to the north; the western boundary was undefined. Two counties would be formed out of Philadelphia County, Berks County which was formed in 1752 (from parts of Chester, Lancaster, and Philadelphia counties), and Montgomery County established in 1784. From these separations, as well as other border moves, come the present-day boundaries of the county.
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