| Year | From | To | ||
|---|---|---|---|---|
| 1504 | Archdiocese of Sevilla {Seville}, Spain | Territory Lost | Diocese of Bayuna, Dominican Republic
Archdiocese of Hyaguata, Dominican Republic Diocese of Magua, Dominican Republic | Erected |
| 1728 | Diocese of Camerino, Italy | Territory Lost | Diocese of Fabriano, Italy | Erected |
| 1850 | Vicariate Apostolic of Cape of Good Hope, Eastern District {Capo de Buona Speranza, Distretto Orientale}, South Africa | Territory Lost | Vicariate Apostolic of Natal, South Africa | Erected |
| 1869 | Diocese of Sandwich, Ontario, Canada | See Transferred | Diocese of London, Ontario, Canada | See Transferred |
| 1895 | Diocese of Niterói (Nictheroy), Brazil | Territory Lost | Diocese of Espírito Santo, Brazil | Erected |
| 1910 | Diocese of Alexandria (in America), Ontario, Canada | Name Changed | Diocese of Alexandria in Ontario, Canada | Name Changed |
| 1924 | Diocese of Saint John in New Brunswick, New Brunswick, Canada | Name Changed | Diocese of Saint John, New Brunswick, Canada | Name Changed |
| 1932 | Vicariate Apostolic of Sianfu, China (Fong-siang, Lungchow, Kiengyang, Linyn, Paoki, and Kishan) | Territory Lost | Prefecture Apostolic of Fengsiang [Fengxiang], China | Erected |
| 1941 | Diocese of Denver, Colorado, USA (Mesa, Delta, Montrose, San Miguel, Ouray, Dolores, San Juan, Montezuma, La Plata, Gunnison, Chaffee, Sagauche, Hinsdale, Mineral, Archuleta, Conejos, Rio Grande, Alamosa, Fremont, Custer, Huenfano, Costilla, Pueblo, Crosley, Kiowa, Otero, Bent, Prowers...) | Territory Lost | Diocese of Pueblo, Colorado, USA | Erected |
| 1941 | Diocese of Denver, Colorado, USA | Elevated | Archdiocese of Denver, Colorado, USA | Elevated |
| 1941 | Diocese of Cheyenne, Wyoming, USA (from Dubuque) | Metropolitan Changed | ||
| 1947 | Diocese of Dallas, Texas, USA (Coleman, Brown, Mills, and Hamilton)
Diocese of Galveston, Texas, USA (Lampasas, Coryeli, McLenan, Limestone, Bell, Falls, Robertson, Williamson, Milam, Brazos, Lee, Burleson, Washington, Austin along with parts of Burnet, Colorado, Fayette, Bastrop, and Travis) Archdiocese of San Antonio, Texas, USA (McCulloch, St. Saba, Mason, Llano, Blanco, Rays, and Caldwell along with parts of Burnet, Trams, and Bastrop) | Territory Lost | Diocese of Austin, Texas, USA | Erected |
| 1947 | Archdiocese of Baltimore-Washington, Maryland, USA | Split | Archdiocese of Baltimore, Maryland, USA
Archdiocese of Washington, District of Columbia, USA (District of Columbia plus Montgomery, Prince George, St. Mary's, Calvert, and Charles Counties in the State of Maryland) | Split |
| 1951 | Archdiocese of Canberra (and Goulburn), Australia
Archdiocese of Sydney, Australia | Territory Lost | Diocese of Wollongong, Australia | Erected |
| 1955 | Diocese of Florida-Melo, Uruguay (Treinta y Tres, and Cerro Largo)
Archdiocese of Montevideo, Uruguay (Lavalleja, Rocha, and Maldonado) | Split | Diocese of Melo, Uruguay | Split |
| 1955 | Diocese of Florida-Melo, Uruguay | Split | Diocese of Florida, Uruguay | Split |
| 1955 | Archdiocese of Montevideo, Uruguay (S. José de Mayo and Canelones (except Joaquin Suarez, Pando, and Sauce))
Diocese of Salto, Uruguay (Colony) | Territory Lost | Diocese of San José de Mayo, Uruguay | Erected |
| 1955 | Diocese of Puerto Montt, Chile (Puerto Octay in Osorno)
Diocese of Valdivia, Chile (Osorno) | Territory Lost | Diocese of Osorno, Chile | Erected |
| 1966 | Prefecture Apostolic of Daru, Papua New Guinea | Elevated | Diocese of Daru, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Goroka, Papua New Guinea | Elevated | Diocese of Goroka, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Kavieng, Papua New Guinea | Elevated | Diocese of Kavieng, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Lae, Papua New Guinea | Elevated | Diocese of Lae, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Yule Island, Papua New Guinea | Elevated | Diocese of Bereina, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Samarai, Papua New Guinea | Elevated | Diocese of Sideia, Papua New Guinea | Elevated |
| 1966 | Prefecture Apostolic of Vanimo, Papua New Guinea | Elevated | Diocese of Vanimo, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Wewak, Papua New Guinea | Elevated | Diocese of Wewak, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Aitape, Papua New Guinea | Elevated | Diocese of Aitape, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Alexishafen, Papua New Guinea | Elevated | Archdiocese of Madang, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Mount Hagen, Papua New Guinea | Elevated | Diocese of Mount Hagen, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Mendi, Papua New Guinea | Elevated | Diocese of Mendi, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Port Moresby, Papua New Guinea | Elevated | Archdiocese of Port Moresby, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Rabaul, Papua New Guinea | Elevated | Archdiocese of Rabaul, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Northern Solomon Islands, Papua New Guinea | Elevated | Diocese of Bougainville, Papua New Guinea | Elevated |
| 1966 | Vicariate Apostolic of Southern Solomon Islands, Solomon Islands | Elevated | Diocese of Honiara, Solomon Islands | Elevated |
| 1966 | Vicariate Apostolic of Western Solomon Islands, Solomon Islands | Elevated | Diocese of Gizo, Solomon Islands | Elevated |
| 1966 | Vicariate Apostolic of Sukarnapura, Indonesia | Elevated | Diocese of Sukarnapura, Indonesia | Elevated |
| 1966 | Prefecture Apostolic of Manokwari, Indonesia | Elevated | Diocese of Manokwari, Indonesia | Elevated |
| 1966 | Vicariate Apostolic of Merauke, Indonesia | Elevated | Archdiocese of Merauke, Indonesia | Elevated |
| 1967 | Diocese of Rancagua, Chile (Navidad and Pirque) | Territory Lost | Archdiocese of Santiago de Chile | Territory Added |
| 1967 | Diocese of Tilarán, Costa Rica (Latin from Pluviensis) | Name Changed | ||
| 1973 | Diocese of Ciudad Altamirano, Guerrero, México (Sultepec and Pozontepec) | Territory Lost | Diocese of Toluca, México, México | Territory Added |
| 1977 | Diocese of Ariano, Italy (Monteleone) | Territory Lost | Diocese of Bovino, Italy | Territory Added |
| 1977 | Diocese of Bovino, Italy (Montaguto) | Territory Lost | Diocese of Ariano, Italy | Territory Added |
| 1978 | Diocese of Honiara, Solomon Islands | Elevated | Archdiocese of Honiara, Solomon Islands | Elevated |
| 1978 | Diocese of Tarawa, Kiribati, Pacific (Oceania) | Name Changed | Diocese of Tarawa, Nauru and Funafuti, Kiribati, Pacific (Oceania) | Name Changed |
| 1978 | Diocese of Gizo, Solomon Islands (from Rabaul) | Metropolitan Changed | ||
| 1979 | Diocese of Meißen (Meissen), Germany | Name Changed | Diocese of Dresden-Meißen (Meissen), Germany | Name Changed |
| 1982 | Territorial Prelature of Bangued, Philippines | Elevated | Diocese of Bangued, Philippines | Elevated |
| 1982 | Territorial Prelature of Bayombong, Philippines | Elevated | Diocese of Bayombong, Philippines | Elevated |
| 1982 | Territorial Prelature of Iba, Philippines | Elevated | Diocese of Iba, Philippines | Elevated |
| 1982 | Territorial Prelature of Iligan, Philippines | Elevated | Diocese of Iligan, Philippines | Elevated |
| 1982 | Territorial Prelature of Kidapawan, Philippines | Elevated | Diocese of Kidapawan, Philippines | Elevated |
| 1982 | Territorial Prelature of Malaybalay, Philippines | Elevated | Diocese of Malaybalay, Philippines | Elevated |
| 1982 | Territorial Prelature of Marbel, Philippines | Elevated | Diocese of Marbel, Philippines | Elevated |
| 1982 | Diocese of Palo, Philippines | Elevated | Archdiocese of Palo, Philippines | Elevated |
| 1982 | Territorial Prelature of San Jose de Antique, Philippines | Elevated | Diocese of San Jose de Antique, Philippines | Elevated |
| 1982 | Diocese of Borongan, Philippines (from Cebu) | Metropolitan Changed | ||
| 1982 | Diocese of Calbayog, Philippines (from Cebu) | Metropolitan Changed | ||
| 1982 | Diocese of Catarman, Philippines (from Cebu) | Metropolitan Changed | ||
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