Mangum was an unincorporated town in Eastland County, Texas, United States. It was founded in the late 1890s at the intersection of the Missouri-Kansas-Texas Railway and the Eastland, Wichita Falls and Gulf Railroad. Mangum was named for the Bob Mangum family. The town's population peaked in 1915 at 125; by 1936, only a handful of residents remained. In 2000, the population of Mangum was estimated at 15.