The parish of St. Thomas More was founded in 1941. On Easter Sunday of that year, Bishop Gerald O’Hara announced the new parish would be named in honor of Saint Thomas More. Bishop O’Hara appointed Fr. Thomas L. Finn to be the first pastor.
In 1950, Fr. Thomas I. Sheehan, the second pastor of St. Thomas More parish. directed the construction of the church and school buildings. In that same year, Sister Anastasia and five of other Sisters of Notre Dame arrived to staff the school. In 1951, these sisters moved into the new convent. They remained in service to the parish for many years.
As St. Thomas More grew, three new parishes were formed from the original parish boundaries. These were Immaculate Heart of Mary and Saints Peter and Paul, and Corpus Christi.
In 1987, during the pastorate of Fr. Patrick F. Mulhern, the parish hall was built, and in 1999, while Fr. Frank Richardson was pastor, the present gymnasium, the church narthex, and the Day Chapel were built.
In February, 2016, Archbishop Wilton Gregory gave over the care of the parish to the Jesuits of the Maryland Province of the Society of Jesus, and Fr. Mark Horak, S.J., was named pastor.
At this time, the parish is thriving, with more than 1,400 registered households (more than 4,000 persons), and 465 students (grades K through 8) in the parish school.