A post office called Alderdale was established in 1907, and remained in operation until 1962.[2] In 1917 it was reported as a station on the Spokane, Portland and Seattle Railway.[3] The community took its name from nearby Alder Creek.[4]
^"Post Offices". Jim Forte Postal History. Retrieved July 12, 2016.
^Landes, Henry (1917). A Geographic Dictionary of Washington(PDF). Washington Geological Survey, Bulletin No. 17. Olympia: Frank M. Lamborn Public Printer. p. 62.