Personal Parish of Church of Assumption - Trilokpuri & Mayur Vihar Phase - III was erected by Archbishop, Most. Rev. Dr. Vincent Concesavo by his ‘Decree of the Creation of Personal Parishes for the Orientals’ dated May 14, 2003. The establishment of parish came in to effect from July 1, 2003. His Excellency Rt. Rev. Dr. Anil Couto, Auxiliary Bishop, installed Fr. Joshy Vezhaparambil as the first vicar of the new parish on July 28, 2003, on the occasion of the feast of St. Thomas. On 25 February 2007, Fr. John Chozhithara took charge of the parish.

It is a fast developing parish with more than 800 registered families. The Sisters of CMC Convent are actively helping the Parish Community. For easy access and convenience, the parish activities are organized under the leadership of three priests in three different centers- Trilokpuri-Mayur Vihar Phase I, Mayur Vihar Phase II- IP Extension and Mayur Vihar Phase III.

From 1993 onwards the Trilokpuri-Mayur Vihar PhaseI Syro-Malabar community started Syro-Malabar mass at Trilokpuri Church. It had three Syro-Malabar masses a month. Fr. Sebastian Vadakumpadan (1993-1995) and Fr. Joseph CST (1995-1997) served the Syro-Malabar community in Trilokpuri. Fr. Joshy Vezhaparambil started to serve the community from 1998 onwards. On 25 February 2007, Fr. John Chozhithara took charge of the parish. On 27th 2008 Fr.Jimmichan Karthanam  was appointed as the Asst Parish Priest of the Church of Assumption, Trilokpuri-Kondli and priest in charge of Trilokpuri Syro Malabar Community.

Though the parish is at an infant stage, it had developed most of the pastoral set up required for the spiritual and cultural needs of the parishioners, such as, Family Units, Parish Council, Youth Group, Christeen Prayer Group, Choir Group and Altar Servers, Mathru Sangam, Vincent De Paul society etc. All the children in the parish are educated in their Christian life by a dedicated team of catechism teachers. The parish has Syro-Malabar Mass in Hindi & English besides, Malayalam.

Centre at a glance
Name:	Church of Assumption
Address:	C/o Prabhu Prakash Girija, Block 13, Trilokpuri, New Delhi-110091
Parish Priest:	Fr. John Chozithara
Priest in charge andAsst. Priest:	Fr. Jimmichan Karthanam
Contact address:	Maria Bhavan,50 A, Gali No. 14, Pratap Nagar, Mayru Vihar Phase I,Delhi Mob.9871275654 E mail:churchofassumption1@gmail.com
Area:	Trilokpuri, Phase I
Members:	800
Institution:	CST Bhavan
Feast:	Nativity of Mother Mary
Activities:	* Catechism * Vincent de Paul Society * Christeen * Charismatic Group * Family Units * Choir Group * Mathru sangam * Altar Servers * DSYM