Gilmore, MissouriGilmore is an unincorporated community in St. Charles County, in the U.S. state of Missouri.HistoryA 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.Notable people Charles Claude Guthrie, physiologist and surgeon