In 1951, the Diocese of Shillong was bifurcated and the Diocese of Dibrugarh was created. In 1964 the Diocese of Shillong was once again divided and a new Diocese of Tezpur was created. In 1969, Shillong diocese was raised to the status of a Metropolitan See and a new Ecclesiastical Province of Shillong - Guwahati was created and Abp Hubert D'Rosario, sdb, was transferred from Dibrugarh to Shillong as its First Archbishop. The Archdiocese of Shillong - Guwahati was divided again in 1973 to form the Diocese of Tura. The next division of Shillong - Guwahati archdiocese was for creation of Diphu Diocese in 1983. On September 23, 1990 Bp Ta5rcisius Testo Phanrang was appointed as Auxiliary Bishop of Shillong Guwahati. Further bifurcation of Shillong - Guwahati Archdiocese was made in 1992 with the creation of Guwahati Diocese.

Abp Hubert D'Rosario, sdb, went to his eternal reward on August 30, 1994. On August 1, 1995, Bp Tarcisius Resto Phanrang was appointed Archbishop of Shillong.At present Shillong Archdiocese, comprises the following districts of Meghalaya: East Khasi Hills, West Khasi Hills, Ri Bhoi and Jaintia Hills.