Mount Pleasant is the county seat of and largest city in Titus County, in the U.S. state of Texas. As of the 2020 census, Mount Pleasant's population was 16,047; it is situated in Northeast Texas. Mount Pleasant was founded May 11, 1848, to serve as county seat for Titus County, which was created by a legislative act on May 11, 1846. Until after the Civil War, Titus County also included the territory of present-day Franklin and Morris Counties. High waters along the creeks and the Sulphur River often halted travel in the early years.