It was July 28, 1837, when Pope Gregory XVI erected the Diocesan See at Natchez. On July 22, 1948, Bishop Richard Oliver Gerow (bishop of Natchez) officially moved the bishop's residence to St. Peter the Apostle in Jackson, Mississippi.
The move to Jackson was not immediately accompanied by a diocesan name change. It was not until 1956 that the Diocese of Natchez–Jackson became the official and legal title of the diocese.
In 1977, almost thirty years after Bishop Gerow's departure from Natchez, the diocese was renamed the Diocese of Jackson. One hundred and forty years after the diocese had been established, Natchez ceased to be a see city.
Sources: Cradle Days of St. Mary’s at Natchez by Richard O. Gerow, bishop of Natchez; 1941 (reprinted 1985); St. Mary’s of Natchez: The History of a Southern Catholic Congregation, 1716-1988, Vols. I & II, by Charles E. Nolan, Ph.D.