Atlantic City, sometimes referred to by its initials A.C., is a Jersey Shore seaside resort city in Atlantic County, in the U.S. state of New Jersey…Atlantic City, sometimes referred to by its initials A.C., is a Jersey Shore seaside resort city in Atlantic County, in the U.S. state of New Jersey. Atlantic City comprises the second half of the Atlantic City-Hammonton metropolitan statistical area, which encompasses those cities and all of Atlantic County for statistical purposes. Both Atlantic City and Hammonton, as well as the surrounding Atlantic County, are culturally tied to Philadelphia and constitute part of the larger Philadelphia metropolitan area or Delaware Valley, the nation's seventh-largest metropolitan area as of 2020.