1. The diocese was bifurcated and the new diocese of Mananthawady formed on March 1, 1973 by the Papal Bull, "Quanta Gloria Orientales Ecclisiae". The territory of the new diocese extends to the districts of Wyanad, Shimoga, Chickmangalur, Hassan, Mandya, Mysore, and Nilgiris.
2. When the new diocese of Palghat was erected on June 20, 1974, those parishes of Tellicherry which belonged to the district of Palghat were entrusted to the new diocese.
3. Ten parishes of the diocese Tellicherry were handed over to the diocese of Mananthawady on December 31, 1975 by a decree of the Sacred Congregation for the Oriental Churches dated December 4, 1975.
By the Papal Bull, "Constant Non Mode Eparchiam Tellicherensis" the diocese was again bifurcated on April 28, 1986 and a new diocese of Thamarassery formed comprising the districts if Calicut and Malapuram.
The Archdiocese was bifurcated again on April 24, 1999. By the Papal Bull, "AD Prepetuam rei Memorian" forming the new diocese of Belthangady by His Holiness Pope John Paul II. The diocese of Belthangady extends to the three civil districts of Dakshina Kannada, Uduppi and Kodagu in Karnataka State.
By the Papal Bull, "Spirituali bono Christfidelium" dated May 18, 1995, Pope John Paul II raised the diocese of Tellicherry to the status of Metropolitan Archdiocese