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. As of 2006, the United States Census Bureau estimates the population at 1,448,394. Philadelphia County is one of the three original counties, along with Chester, and Bucks counties, created by William Penn in November 1682.

Adjacent Counties

• Montgomery County (north)
• Bucks County (northeast)
• Burlington County, New Jersey (east)
• Camden County, New Jersey (southeast)
• Gloucester County, New Jersey (south)
• Delaware County (west)

Districts, townships and boroughs of the County of Philadelphia