Alto is an extinct town in Columbia County, in the U.S. state of Washington. The GNIS classifies it as a populated place.
A post office called Alto was established in 1882, and remained in operation until 1903. The community was so named on account of its lofty elevation.
Coordinates: 46°23′11″N 118°06′42″W / 46.38639°N 118.11167°W