King Street Station is a train station in Seattle, Washington, United States. Located between South King and South Jackson streets and Second and Fourth Avenues South in the Pioneer Square neighborhood of Seattle, the station is just south of downtown. Built between 1904 and 1906, it served the Great Northern Railway and Northern Pacific Railway from its grand opening on May 10, 1906, until the creation and start of Amtrak on May 1, 1971. The station was designed by the St. Paul, Minnesota architectural firm of Charles A. Reed and Allen H. Stem, who were later associate designers for the New York Central Railroad's Grand Central Terminal in New York City.