Philadelphia is also one of the largest college towns in the U.S., with over 120,000 college and university students enrolled within the city limits and nearly 300,000 in the metropolitan area.

Philadelphia was a major center of the independence movement during the American Revolutionary War. The Declaration of Independence and US Constitution were drafted here and signed in the city's Independence Hall. The United States Marine Corps also began here on November 10, 1775. The two most noticeable streets are Broad (north-south) and Market (east-west).

Philadelphia has its own stock exchange. The city has a large contingent of law firms. The city is also a national center of law due to the prestigious University of Pennsylvania Law School and the Temple University Beasley School of Law.

There are 2 airports, Philadelphia International Airport (PHL) and Northeast Philadelphia Airport, within the city limits. Since the early days of rail transport in the United States, Philadelphia has served as hub for several major rail companies, especially the Pennsylvania Railroad (PRR) and the Reading Railroad (Reading). Philadelphia is notable also as one of the few North American cities to maintain streetcar lines.

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