The City of Alexandria has multiple METRO locations including Braddock Road, King Street, Eisenhower Avenue, and Van Dorn Street. In the County of Fairfax the Huntington station has an Alexandria mailing address and ZIP code 22303/22306. You may go to http://www.wmata.com, the rail tab and use the map function and find the nearest station to you. Of course the closer you are to a station, then prices are higher.
Hopes this answers your question. Sincerely - Bob Lepelletier
REALTOR, ABR, GRI - Partner - Team Maison at Keller William Realty
703 310 7880 - bob at bobtherealtor dot pro