Philadelphia, Pennsylvania, is a collection of energetic neighborhoods surrounded by charming towns. With a population of about 1,600,00, it is the sixth-most-populous city in the U.S. and the most populous city in the state. It is the economic and cultural center of the greater Delaware Valley, which has about 7.21 million residents.
Pennsylvania is in the Mid-Atlantic, Northeastern, and Appalachian regions of the U.S. It shares borders with Delaware, Maryland, West Virginia, Ohio, Lake Erie, Ontario (Canada), New York, and New Jersey. It is the 33rd-largest state by area, the fifth-most populous state (about 13,011,844 residents), and the ninth-most densely populated. Its capital city is Harrisburg.