The Delaware Valley, sometimes referred to as Greater Philadelphia, Philadelphia metropolitan area, or Philadelphia tri-state area, and locally and colloquially referred to as Philly-Jersey-Delaware, is a major metropolitan area in Northeast United States that centers on Philadelphia, the sixth-most populous city in the United States, and spans part of f…The Delaware Valley, sometimes referred to as Greater Philadelphia, Philadelphia metropolitan area, or Philadelphia tri-state area, and locally and colloquially referred to as Philly-Jersey-Delaware, is a major metropolitan area in Northeast United States that centers on Philadelphia, the sixth-most populous city in the United States, and spans part of four states: Southeastern Pennsylvania, Southern New Jersey, Northern Delaware, and the northern Eastern Shore of Maryland, though it is sometimes considered a tri-state region if northeast Maryland is excluded. With a core of 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.