The Delaware Valley, sometimes referred to as Greater Philadelphia or the Philadelphia metropolitan area, is a major metropolitan region in the Northeast United States that centers on Philadelphia, the nation's sixth-most populous city, and spans parts of four U.S. states: southeastern Pennsylvania, southern New Jersey, northern Delaware, and the nort…The Delaware Valley, sometimes referred to as Greater Philadelphia or the Philadelphia metropolitan area, is a major metropolitan region in the Northeast United States that centers on Philadelphia, the nation's sixth-most populous city, and spans parts of four U.S. states: southeastern Pennsylvania, southern New Jersey, northern Delaware, and the northern Eastern Shore of Maryland. With a core metropolitan statistical area population of 6.288 million residents and a combined statistical area population of 7.366 million as of the 2020 census, the Delaware Valley is the eighth-largest metropolitan region in the United States and the 68th-largest metropolitan region in the world.