Its suffragan dioceses are: Osorno, San Carlos de Ancud and Punta Arenas.

The diocese of Puerto Montt was created with territory carved out of the diocese of San Carlos de Ancud, on 11 April 1939, by Pope Pius XII and elevated to Archdiocese and Metropolitan on May 10, 1963.

The "Virgen del Carmen" is the patroness saint of the archdiocese.

The archdiocese, which comprises the entire province of Llanquihue in the Los Lagos region of Chile, covers a territory of 18,205 km2 and has 31 parishes.

[1] The diocesan cathedral, located in the city of Puerto Montt, was built in 1870 in the doric style and is dedicated to the "Virgen del Carmen".