Philadelphia  is in Pennsylvania.
Philadelphia ( [ ˌfɪləˈdɛlfi.ə ] ) is the largest city in the Commonwealth of Pennsylvania and the sixth-most populous city in the United States , with an estimated population of 1,567,872 and more than 6 million in the seventh-largest metropolitan statistical area , . In 1682 , William Penn , an English Quaker , founded the city to serve as capital of the Pennsylvania Colony . Philadelphia is the center of economic activity in Pennsylvania and is home to seven Fortune 1000 companies .