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Philadelphia County is the core county in the Philadelphia-Camden-Wilmington Combined Statistical Area (PA-NJ-DE-MD, located along the lower Delaware and Schuylkill Rivers, within the Northeast megalopolis.
The city is bordered by six adjacent counties: Montgomery to the northwest; Bucks to the north and northeast; Burlington County, New Jersey to the east; Camden County, New Jersey to the southeast; Gloucester County, New Jersey to the south; and Delaware County to the southwest.
Learn about the history and evolution of Philadelphia County, the original county of Pennsylvania founded by William Penn in 1682. Explore how the county shaped the city's development, local government, and political reform until its consolidation in 1854.
1 day ago · Philadelphia, city and port, coextensive with Philadelphia county, southeastern Pennsylvania, and situated at the confluence of the Delaware and Schuylkill rivers. It is the largest city in the state. Learn more about Philadelphia, including its history, in this article.
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. Its county seat is Philadelphia, the nation's sixth-largest city.
Learn about the history and features of the counties in the Philadelphia region, including Pennsylvania, New Jersey, and Delaware. Find articles on Philadelphia County, the original county that became part of the city in 1854.
Learn about the population, diversity, economy, education, housing, health and more of Philadelphia County, PA in 2022. See charts, maps and data sources for this county and its neighboring and parent geographies.
