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Philadelphia County is the most populous county in the U.S. state of Pennsylvania. The county is the second smallest county in Pennsylvania by land area. Philadelphia County is one of the three original counties, along with Chester and Bucks counties, created by William Penn during November 1682. Since 1854, the county has been coterminous with the City of Philadelphia, which also serves as its seat of government. Philadelphia County is the economic and cultural anchor of the Delaware Valley, the eighth-largest combined statistical area in the United States, with a population of 7.2 million.