Baltimore/Washington International Thurgood Marshall Airport (IATA: BWI, ICAO: KBWI, FAA LID: BWI), commonly referred to as Baltimore/Washington International Airport as well as BWI or BWI Marshall, is an international airport in the Eastern United States serving mainly Baltimore, Maryland and Washington, D.C. With Dulles International Airport and Ronald Reagan Washington National Airport, it is one of three major airports serving the Washington–Baltimore metropolitan area. Located in an unincorporated area of Anne Arundel County, the airport is 9 miles (14 km) south of Downtown Baltimore and 30 miles (48 km) northeast of Washington, D.C.