Philadelphia, Pennsylvania is the fifth-most-populous city in the United States and the largest in the Commonwealth of Pennsylvania, both in area and population. Since 1854, the city has been coterminous with Philadelphia County. Philadelphia has the second-largest downtown residential population in the U.S., behind New York, just edging out Chicago. The Philadelphia metropolitan area is the fourth-largest in the U.S. by the official definition, with some 6.9 million people. Philadelphia is the central city of the Delaware Valley metropolitan area.
Philadelphia is one of the oldest and most historically significant U.S. cities. It was the nation's first capital. At the time of the American Revolution, it was the second-largest English-speaking city in the world, after only London. Into the first part of the 19th century, it was the country's most populous city and eclipsed Boston and New York City in political and social importance. Benjamin Franklin played an extraordinary role in Philadelphia's rise.
- September 6, 1943 - 79 people are killed when a Pennsylvania Railroad train derails in Kensington.
- September 15, 1855 - Philadelphia City Council dedicates Fairmount Park to the public.
- September 22, 1734 - A large number of followers of the Schwenkfelder Church, a religious sect that follows the teachings of Kaspar Schwenkfeld von Ossig, arrive in Philadelphia.
- September 26, 1777 - American Revolutionary War: British forces, led by General Howe, march into Philadelphia.
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- Official Government Website
- Greater Philadelphia Tourism Marketing Corporation
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- List of Nobel Laureates affiliated with the University of Pennsylvania
- List of Philadelphia Phillies managers
- List of Philadelphia 76ers head coaches
- List of Philadelphia Eagles first-round draft picks
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