Dumas (/ˈdjuːməs/ DEW-mus) is a city in Moore County, Texas, United States. The population was 14,691 at the 2010 census. It is the county seat of Moore County. Located about 50 miles north of Amarillo, the city is named for its founder, Louis Dumas (1856–1923). Dumas Avenue, the main thoroughfare, is also United States Highways 287 and 87.
Window on the Plains Museum, which offers exhibits on Moore County and the Texas Panhandle, is located on South Dumas Avenue, the main thoroughfare. Dumas is home to Moore County Airport, a general-aviation airport 2 miles west of the central business district.
The Dumas government claims, with some documentation, that the song "I'm a Ding Dong Daddy From Dumas" was written about the city. Composed in the late 1920s by Phil Baxter (a native Texan who lived for a time in Dumas) and Carl Moore, the song has also sometimes been claimed by Dumas in Desha County in southeastern Arkansas.