It is based at Tirunelveli, in the state of Tamil Nadu, southern India.

In 2014, the diocese had 718 churches, 99 pastors, and a membership of 1,34,277;[1] it also ran 342 schools and fifteen colleges and hospitals.

In the year of 1919 Tinnevely Diocese Trust Association (TDTA) was formed by uniting both mission and also with Baptists and Presbyterians churches in the neighbourhood.

In October 1896, Tinnevelly (the British name for Tirunelveli[2]) was separated from the Diocese of Madras and Rev.

Samuel Morley was ordained as the first Bishop of the newly formed diocese.