Philadelphia County, Pennsylvania

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Philadelphia County
Consolidated city-county
City and County of Philadelphia
Old City Hall in Philadelphia in June 2011
Flag Seal
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°01′N 75°08′W / 40.01°N 75.13°W / 40.01; -75.13
Country	United States
State	Pennsylvania
Founded	March 10, 1682
Named for	City of Philadelphia
Seat	Philadelphia
Largest city	Philadelphia
Area
• Total	143 sq mi (370 km2)
• Land	134 sq mi (350 km2)
• Water	8.6 sq mi (22 km2)  6.0%
Population  (2020)
• Total	1,603,797
• Density	11,969/sq mi (4,621/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional districts	2nd, 3rd, 5th
Website	www.phila.gov

Philadelphia County is the most populous county in Pennsylvania and the 24th-most populous county in the nation. As of the 2020 census, the county had a population of 1,603,797.^[1] Its county seat is Philadelphia, the nation's sixth-largest city. The county is part of the Southeast Pennsylvania region of the state.^[a]

Philadelphia County is one of the three original counties, along with Chester and Bucks counties, founded 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 nation with an estimated population of 7,381,187 as of 2022.^[2]

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