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 6th-most populous city in the United States, and spans part of fou…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 6th-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 from the definition. With a core of metropolitan statistical area population of 6.288 million residents and a combined statistical area population of 7.366 million, Delaware Valley is the eighth-largest metropolitan region in the United States and the 68th-largest metropolitan region in the world.