Its Chapter was composed of eight dignities (the Cantor, four Archdeacons, the Scholasticus, the Treasurer, and the Penitentiary) and twenty-five Canons.

There were also six Choral Vicars, forty-two chaplains, fourteen choristers and six boy singers, and a body of musicians.

[3] The diocese contained seven houses of Benedictine monks: Saint-Sever, Lessay, Saint-Sauveur le Vicomte, Montebourg, Hambie, Notre-Dame de Protection (Valognes, 1626, women), and Notre-Dame des Anges (Coutances, 1633, women).

The Chapter of the Cathedral had six dignities (the Dean, the Cantor, the Treasurer, the Scholasticus and the two Archdeacons) and eighteen Canons.

[7] The Diocese of Avranches was abolished during the French Revolution by the Legislative Assembly, under the Civil Constitution of the Clergy (1790).

When the Concordat of 1801 was struck between Pope Pius VII and First Consul Bonaparte, the Diocese of Avranches was not revived.