Sheridan is a town in Madison County, Montana, United States named after the Civil War general Philip Sheridan. The population was 694 at the 2020 census. Sheridan is known as the "heart of the Ruby Valley." Seven mountain ranges surround the town: Tobacco Root Mountains, Highland Mountains, McCartney Mountain, The Pioneers, The Ruby Range, The Gravelly Range and the Snowcrest Range. The Ruby River winds through the valley just west of the town.