On December 16, 1866, seven charter members organized the First Baptist Church of Pleasanton. The congregation worshiped in several locations, including the county courthouse in 1867, a schoolhouse south of town in 1870, and the Rock Schoolhouse beginning in 1875. In 1879, Mildred Mansfield (1816-1892) and her son F. M. (1836-1902) donated land at this site, and the congregation's first sanctuary was completed in 1883. Along with worship and educational programs for its members, the church took part in both foreign and domestic missionary endeavors. As the congregation grew over the years, additional buildings were erected to meet membership needs. New structures were completed in the 1950s and 1960s before the church's centennial celebration in 1966. A fire destroyed much of the main church building in February 1972, but the congregation rebuilt and dedicated the renovated structure in October 1974. The Old Rock Schoolhouse, where early members had met for worship services, became part of the church plant in 1986.