The Oak Grove Baptist Church was founded in Mosier Valley in 1874, and also an elementary school, in 1883. The Mosier Valley school was always in one of the Hurst, Euless, or Bedford districts. Also around that time the community constructed a building that was shared by the school, church, and the Masonic lodge. The congregation of the Church changed its name to St. John Missionary Baptist Church and built its own building in 1911. The church still occupies the same location.
Several tombstones at Mosier Valley Cemetery. The first recorded grave is from 1870. Lucy Lee, a descendant of a white family who owned much of the land on which Mosier Valley developed, donated two acres of land for the Mosier Valley Cemetery. The Lee family plot is enclosed by a rock wall.