Organized as Medina Baptist Church in April 1857 at Mann's Crossing near Macdona, the congregation first held services in homes or a schoolhouse until 1866, when members built an arbor near Old Somerset. In 1867, committeemen F.M. Avent, Elisha A. Briggs, and W.D. Johnson bought the 2.5-acre meetinghouse and cemetery site for ten dollars on behalf of Medina Church, drew the plans, and Briggs, a Massachusetts settler and stonemason, did much of the construction. Worship began here in 1869 as soon as the house had roof and walls, though the door and window spaces were empty and the floor was still bare ground. In its early years, four ordained ministers served in turn as unpaid pastors, while Avent was clerk and sexton. The congregation was racially integrated, and some of its Negro members are buried in honored graves in the cemetery. In 1892 the church relocated at Bexar, but the cemetery continued to be maintained here and Old Rock was sometimes used for funerals or worship. In 1921, after local petroleum discoveries, Grayburg Oil Company and some of its employees helped renovate the meetinghouse, and the congregation renamed itself for Old Rock Church and has continued regular worship here ever since.