In September, 1982, a group approached the then Rome District Superintendent, the Rev. Rudy Baker about starting a new United Methodist Church in Cartersville. In October, 1982, Bishop Joel McDavid authorized the group to begin planning for a new church.

Arrangements were made to allow the church to meet and to hold Sunday Services in the Stiles Auditorium on West Cherokee Avenue; the group then made arrangements to lease a parsonage. At the 1983 Annual Conference of the North Georgia Conference of the United Methodist Church, the new church, Trinity United Methodist Church in Cartersville was assigned its first Pastor, the Rev. Steve Lyle.

Our first service on the last Sunday in June 1983, at the Stiles Auditorium was attended by 123 persons. The church was officially chartered on September 11, 1983, with 104 charter members.

On March 20, 1984, the church acquired 12 acres on West Avenue, which was to become our new home. On April 15, 1985, we began construction of our first facility containing 10,728 square feet consisting of a sanctuary, with two overflow areas, capable of being used as classrooms which would give us a total seating capacity of 496 for worship. The building contained 2 restrooms, 3 offices, 2 nurseries, a choir room, a kitchen and 6 classrooms. The facility was occupied February 9, 1986 with 318 persons in attendance.

In June 1988, our second minister the Rev. Dr. Bill Britt was assigned and we had on roll 365 members. In 1990 we completed our first addition consisting of 4 classrooms and 2 bathrooms.

In June 1995, we acquired the Bartow County Bank property and completed a second classroom addition, which consisted of 6 classrooms and the drive through on the rear of our present building. We were not able to build the Family Life Center as planned, but continued to finalize its plan.

In June 1997, we welcomed our third Pastor, the Rev. John Whatley, and our membership had risen to 786. In January 1999, we began construction on our third addition, which consisted of our present Family Life Center and a classroom wing consisting of a youth room and 6 classrooms, which connected our then existing building with the new Family Life Center. This addition was completed and occupied Dec. 13, 1999. The interior of the classroom addition was completed as a result of donations by the Trinity School and by the individual groups occupying the classrooms at no additional cost to the church.

In June 2002, we received our fourth pastor the Rev. Dr. Ed Wadsworth and our membership stood at 951. The Trinity School extended to grade 6 in school year 2006/2007.

In school year 2007/2008 our Trinity School extended to grade 7 with plans for extension to grade 8 in the future.

In June 2008, we welcomed the Rev. Mike Morgan and our membership stood at 1236.

After Pastor Mike left, Rev. Dr. Kirk Bozeman became our pastor up until June 2017, with Rev. Steve Lyle returning to Trinity UMC.