High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Roman Catholic Diocese of Marquette is a suffragan diocese of the Roman rite, encompassing all of the Upper Peninsula of Michigan, in the ecclesiastical province of the Archbishop of Detroit. It encompasses an area of 16,281 square miles (42,152 square kilometers). Its cathedral is St. Peter Cathedral in Marquette, which replaced Holy Name of Mary Proto-Cathedral at Sault Ste. Marie. As of 2000, the number of registered Catholics in the diocese was 65,500. Fifty-eight diocesan priests and 11 religious were serving the people at 74 parishes and 23 missions. There were 10 parish grade schools. Sixty-three women religious were also in service to the diocese.