[1] It is immediately exempt to the Holy See, specifically the missionary Congregation for the Evangelization of Peoples, and is not part of any ecclesiastical province.

Its cathedral is the Cathédrale Saint-Ignace, dedicated to Ignatius of Loyola (founder and patron saint of the Society of Jesus), in the episcopal see of Mongo, in Guéra.

The jurisdiction was established on 1 December 2001 as the Apostolic Prefecture of Mongo from territory split off from the metropolitan Archdiocese of N'Djaména and from the Diocese of Sarh.

It was promoted on 3 June 2009 as the Apostolic Vicariate of Mongo, and is administered by a titular bishop who acts as ordinary.

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