According to the 2010 U.S. Census, the population of the city proper was 1,526,006. The Greater Philadelphia metropolitan area has a population of 6.1 million and is the country's fifth-largest metro area. The city, which lies about 80 miles (130 km) southwest of New York City, is also the nation's fourth-largest consumer media market, as ranked by the Nielsen Media Research.
It is the county seat of Philadelphia County, with which it is coterminous. Popular nicknames for Philadelphia include Philly and The City of Brotherly Love, from the literal meaning of the city's name in Greek (Greek: Φιλαδ?λφεια ([p?ila'delp?e?a], Modern Greek: [fila'ðelfia]) "brotherly love", compounded from philos (φ?λος) "love", and adelphos (?δελφ?ς) "brother").
A commercial, educational, and cultural center, Philadelphia was once the second-largest city in the British Empire (after London), and the social and geographical center of the original 13 American colonies. It was a centerpiece of early American history, host to many of the ideas and actions that gave birth to the American Revolution and independence. It was the most populous city of the young United States, although by the first census in 1790, New York City had overtaken it. Philadelphia served as one of the nation's many capitals during the Revolutionary War and after. After the ratification of the U.S. Constitution, the city served as the temporary national capital from 1790 to 1800 while Washington, D.C., was under construction.