Addison Road (also known as Addison Road–Seat Pleasant) is an island platformed Washington Metro station in Walker Mill, Maryland, United States. The station was opened on November 22, 1980, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Providing service for the Blue and Silver Lines, the station is located near the residential area of Seat Pleasant on Central Avenue near Addison Road. In December 2012, Addison Road was one of five stations added to the route of the Silver Line, which was originally supposed to end at the Stadium-Armory station, but was extended into Prince George's County, Maryland to the Largo Town Center station (the eastern terminus of the Blue Line) due to safety concerns about a pocket track just past Stadium-Armory.