Center City, or Downtown Philadelphia includes the central business district and central neighborhoods of the City of Philadelphia, Pennsylvania, United States. As of 2010, its residential population of over 57,000 made it the third most populous downtown in the United States, after New York City’s and Chicago’s.
Philadelphia is the largest city in the Commonwealth of Pennsylvania and the county seat of Philadelphia County, with which it is coterminous. The city is located in the Northeastern United States along the Delaware and Schuylkill rivers. It is the fifth-most-populous city in the United States of America, with a population of 1,526,006 as of the 2010 U.S. Census. Philadelphia is also the commercial, cultural, and educational center of the Delaware Valley, home to 6 million people and the country’s fifth-largest metropolitan area.