Today, 3 December 2018, His Holiness Pope Francis united the Diocese of Moosonee with the Diocese of Hearst and appointed the Most Reverend Robert Bourgon Bishop of the new Diocese of Hearst-Moosonee. At the time of this new appointment, Bishop Bourgon was both the Bishop of the Diocese of Hearst and the Apostolic Administrator of the Diocese of Moosonee to which he had been named by Pope Francis on 25 April 2016.

The former Diocese of Moosonee has 14 parishes and missions, with a Catholic population of 3,830 served by five priests who are members of institutes of consecrated life. The former Diocese of Hearst has 18 parishes and missions, with a Catholic population of 20,045 served by 21 diocesan priests, two permanent deacons, and three religious Sisters.