The Delaware Valley, an expansive urban zone that touches four states, is the eighth-largest metropolitan region in the United States. Anchored by Philadelphia but encompassing other major cities, including Camden, NJ and Wilmington, DE, the area is home to a population of about six million people. Counties within the region include Philadelphia, Montgomery, and Bucks counties in Pennsylvania; Camden, Burlington, and Gloucester counties in New Jersey; Cecil County in Maryland; and Kent and Newcastle counties in Delaware. In addition to housing a large amount of significant historical sites, the Delaware Valley is the anchor of a bustling economic and educational hub. The presence of major industrial centers in the Delaware Valley combined with institutions of higher education, including the University of Pennsylvania, Villanova University, and Temple University, yields a highly mobile populace. Commuting to work across state lines is not uncommon, especially for those in Delaware and Maryland counties of the Valley metro.