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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 a legal nullity. All county functions were assumed by the city in 1952. The city has been coterminous with the county since 1854.
Learn about the population, diversity, economy, education, housing, health and more of Philadelphia County, PA. See charts, maps and data sources for the county and its cities and towns.
Jun 21, 2024 · Official website of the City of Philadelphia, includes information on municipal services, permits, licenses, and records for citizens and businesses.
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Philadelphia County is the most populous county in the U.S. state of Pennsylvania. As of 2020, Philadelphia County had a population of 1,603,797 residents. The county is the second smallest county in Pennsylvania by land area, but the largest in population.