Philadelphia is by far the largest city in Pennsylvania and is also the sixth most populous city in the entire United States. A globally famous city with dozens of historic landmarks and attractions, Philadelphia is located on the Delaware and Schuylkill Rivers in the Delaware Valley and covers an area of 142.71 square miles. Philadelphia has an estimated population of 1.58 million people, with over 6 million living in the surrounding metropolitan area.
The city was founded in 1682 by an English explorer and writer named William Penn. Philadelphia has a rich history behind it, playing a key role in various major events of American history like the American Revolution. The Declaration of Independence was signed in the city, and the first library, zoo, business school, and hospital in the United States were all constructed in Philadelphia.