Mason is a ghost town in Butte County, in the U.S. state of South Dakota.
Mason was laid out in 1912, and named in honor of a local family.[1] A post office called Mason was established in 1912, and remained in operation until 1940.[2]
44°48′53.48″N 103°49′8.67″W / 44.8148556°N 103.8190750°W