Foss is a town in Washita County, Oklahoma, United States. At one time the town had a population of nearly 1000 residents. During World War II, the town boasted a population of over 300 residents, relying primarily on Route 66 travellers (which passed half a mile south of the city) and a U.S. naval base south of the town that operated during wartime. A gas station and a café also operated in the town around that time. The population was 127 at the 2000 census. Today, though still incorporated, Foss is considered to be a ghost town.