In a land area of 3,819 square kilometers, the diocesan territory covers the districts of East and West Jaintia Hills in Meghalaya.

The Diocese of Jowai was erected on 28 January 2006, by Pope Benedict XVI, and Father Vincent Kympat was appointed its first bishop.

When the new diocese of Jowai was erected in the year 2006, it had 59,095 baptized Catholics in the territory which covers Jaintia hills district under 7 parishes.

Before becoming a prelate Bishop Kympat was the chairman of Faith Formation Commission and Diocesan Coordinator for Small Christian Communities in the Archdiocese of Shillong.

He was the Chairman of Small Christian Communities Commission in North Eastern Regional Bishops' Council of India before he died on 30 July 2011.