Philadelphia County, Pennsylvania

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Philadelphia County is a county located in the U.S. State of Pennsylvania. It is coterminous with the city of Philadelphia which also serves as its seat. In 2009, the United States Census Bureau estimated the population had grown to 1,547,901, making it the most populous county in the state. Philadelphia County is one of the three original counties, along with Chester and Bucks counties, created by William Penn in November 1682.

This county is part of the Delaware Valley area and is one of the flagships of the Greater Philadelphia MSA.



According to the United States Census Bureau, the county has a total area of 142.6 square miles (369.4 km²), of which 135.1 square miles (349.9 km²) is land and 7.6 square miles (19.6 km²) is water. The total area is 5.29% water. Bodies of water include the Delaware River, Schuylkill River, Cobbs Creek, Wissahickon Creek, and Pennypack Creek.

The lowest point in the county lies 10 feet above sea level near Fort Mifflin in Southwest Philadelphia at the convergence of the Delaware and Schuylkill Rivers. The highest point is in Chestnut Hill, at 432 feet above sea level, near Evergreen Place, just north and west of Evergreen Avenue.

Adjacent counties

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