Alderdale is an extinct town in Klickitat County, in the U.S. state of Washington. The GNIS classifies it as a populated place.
A post office called Alderdale was established in 1907, and remained in operation until 1962. In 1917 it was reported as a station on the Spokane, Portland and Seattle Railway. The community took its name from nearby Alder Creek. —————1900Unknown1910Unknown19203271930Unknown1940Unknown1950Unknown1960Unknown1970Unknown1980Unknown1990Unknown2000Unknown2010Unknown2020Unknown2023 (est.)Unknown
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