The growth and development of Mims Baptist Church parallels that of the oil industry in Montgomery County. A group of born-again Christians met in January of 1933 in the home of Mr. and Mrs. J.R. Price in the old Humble Oil Camp. At this meeting the Rev. Henry Jones, District Missionary, aided in the organization of the church to be known as the First Baptist Church of Humble Camp. The church voted to call Rev. George D. Burns of New London, Texas as its pastor. John I. Butler, Sr. later donated a site for the building, and volunteer labor built the church. The church was located at the old Youens Switch on the Santa Fe Railroad east of town on which Jefferson Chemical Company is now located.
On January 28, 1944, the First Baptist Church of Humble Camp met in conference and entered into a discussion to move and enlarge the church. Mr. and Mrs. Ira B. Mims offered to deed the church three acres of land on Porter Road, next to the cemetery. A brush arbor was hastily constructed, and the church met beneath it while using the lumber from the first church to help build the new wooden frame church building.
In appreciation for the gift of land, the congregation voted to change the church's name to Mims Memorial Baptist Church in honor of the deceased loved ones of the Mims family. A dedication service was held for this church building on Sunday, June 22, 1947. In 1960, a new brick sanctuary and classrooms were added. The third sanctuary and Family Activities building were dedicated August 8, 1976, and two-story Education building was dedicated June 28, 1981. The house and property located next door to the church were acquired from Sam and Leatha Vanderburg following Sam's death in 1985.