Easton is a census-designated place (CDP) in Kittitas County, Washington, United States. The population was 478 at the 2010 census.
Easton was platted in 1902. It was given its name by the Northern Pacific Railway due its location near the east end of the Stampede Tunnel.
Easton is located at 47°14′18″N 121°10′42″W / 47.23833°N 121.17833°W / 47.23833; -121.17833 (47.238368, -121.178327).