A post office called Gilmore was established in 1884, and remained in operation until 1959. Gilmore was named for Thomas Gilmore, an early settler who was one of a company to march against the British at Rock Island and who was killed by Indians.
- U.S. Geological Survey Geographic Names Information System: Gilmore, Missouri
- "Post Offices". Jim Forte Postal History. Retrieved 27 November 2016.
- Eaton, David Wolfe (1918). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. p. 356.