| Year | From | To | ||
|---|---|---|---|---|
| 1778 | Archdiocese of Santafé en Nueva Granada, Colombia | Territory Lost | Diocese of Mérida, Venezuela | Erected |
| 1872 | Diocese of Boston, Massachusetts, USA
Diocese of Hartford, Connecticut, USA | Territory Lost | Diocese of Providence, Rhode Island, USA (RI plus the Counties of Bristol, Barnstable, Dukes, and Nantucket along with part of Plymouth in Massachusetts) | Erected |
| 1872 | Diocese of Albany, New York, USA | Territory Lost | Diocese of Ogdensburg, New York, USA (Counties of St. Lawrence, Franklin, Clinton, Ifferson, Lewis, and Essex along with parts of Hamiliton and De Herkimer) | Erected |
| 1921 | Diocese of San José de Costa Rica (Alajuela, Puntarenas, and Guanacaste.) | Territory Lost | Diocese of Alajuela, Costa Rica | Erected |
| 1921 | Diocese of San José de Costa Rica (Limón and the Carthaginian Canton of Turrialba) | Territory Lost | Vicariate Apostolic of Limón, Costa Rica | Erected |
| 1921 | Diocese of San José de Costa Rica (San José, Heredia, and Cartago) | Elevated | Archdiocese of San José de Costa Rica | Elevated |
| 1922 | Vicariate Apostolic of Kuiceu (Kweichow), China (Panhien, Pougan, Ganlan, Hinjen, Hiny, Tchenfong, Lanlong, Tsehen, and Loufou along with Matchang, Nicoutchang, Tchehiang (in Kouanlin) and Potang, Hohon, Yangkia, and Cheten (in Tseyuin))
Vicariate Apostolic of Kuamsi, China (Liniun, Silong, and Silin) | Territory Lost | Prefecture Apostolic of Lanlung [Anlong], China | Erected |
| 1952 | Diocese of Baker City, Oregon, USA | Name Changed | Diocese of Baker, Oregon, USA | Name Changed |
| 1952 | Diocese of Amazonas, Brazil | Elevated | Archdiocese of Manaus, Amazonas, Brazil (and name change) | Elevated |
| 1952 | Diocese of Lins, Sao Paulo, Brazil | Territory Lost | Diocese of Marília, Sao Paulo, Brazil | Erected |
| 1952 | Diocese of Natal, Brazil | Territory Lost | Archdiocese of Natal, Rio Grande do Norte, Brazil | Erected |
| 1952 | Diocese of Mossoró, Rio Grande do Norte, Brazil (from Paraíba) | Metropolitan Changed | ||
| 1952 | Diocese of Caicó, Rio Grande do Norte, Brazil (from Paraíba) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Rio Branco, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Rio Negro, Amazonas, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Juruá, Acre, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Lábrea, Amazonas, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Porto Velho, Rondonia, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of São Peregrino Laziosi no Alto Acre e Alto Purus, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Alto Solimões, Amazonas, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1952 | Territorial Prelature of Tefé, Amazonas, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 1953 | Diocese of Harbour Grace, Newfoundland, Canada (Boundaries adjusted)
Diocese of Saint George’s, Newfoundland, Canada (Boundaries adjusted) Archdiocese of Saint John’s, Newfoundland, Canada (Boundaries adjusted) | Territory Added | ||
| 1958 | Diocese of Ciudad Victoria-Tamaulipas, Tamaulipas, México (Nueva Laredo, Guerrero, Mier, Miguel Alemán, Camargo, Reynosa, Méndez, Matamoros, Valle Hermosa, San Fernando, Cruillas, San Nicolás, and Burgos) | Territory Lost | Diocese of Matamoros, Tamaulipas, México | Erected |
| 1958 | Diocese of Espírito Santo, Brazil (Cachoeiro de Itapemirim, Alegre, Castelo, Guaçui, Iconha, Itapemirim, Luna, Mimoso do Sul, Muniz Freiré, Muqui, Rio Novo de Sul, São José do Calcado, and Vaia do Sousa) | Territory Lost | Diocese of Cachoeiro do Itapemirim, Espirito Santo, Brazil | Erected |
| 1958 | Diocese of Espírito Santo, Brazil | Territory Lost | Diocese of São Mateus, Espirito Santo, Brazil | Erected |
| 1958 | Diocese of Espírito Santo, Brazil | Name Changed | Archdiocese of Vitória, Espirito Santo, Brazil | Name Changed |
| 1959 | Diocese of Sinaloa, México | Name Changed | Diocese of Culiacán, Sinaloa, México | Name Changed |
| 1963 | Diocese of Lingayen-Dagupan, Philippines
Diocese of San Fernando, Philippines | Territory Lost | Diocese of Cabanatuan, Philippines (Nueva Ecija) | Erected |
| 1963 | Diocese of San Fernando, Philippines | Territory Lost | Diocese of Tarlac, Philippines | Erected |
| 1963 | Diocese of Lingayen-Dagupan, Philippines | Elevated | Archdiocese of Lingayen-Dagupan, Philippines | Elevated |
| 1963 | Delegation to Belgian Congo | Elevated | Nunciature to Congo, Democratic Republic of | Elevated |
| 1966 | Nunciature to Finland (to Nunciature) | Elevated | ||
| 1968 | Diocese of Iringa, Tanzania
Territorial Abbey of Peramiho, Tanzania | Territory Lost | Diocese of Njombe, Tanzania (Njombe District) | Erected |
| 1984 | Diocese of Tagum, Philippines (Davao Oriental) | Territory Lost | Diocese of Mati, Philippines | Erected |
| 1984 | Diocese of Cabanatuan, Philippines (Oarranglan, Cuyapo, Guimba, Licab, Llanera, Lupao, Munoz, Nampicuan, Pantabangan, Quezon, Rizal, Santo Domingo, Talugtog, and San José City) | Territory Lost | Diocese of San Jose, Philippines | Erected |
| 1991 | Diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino, Italy | Name Changed | Diocese of Viterbo, Italy | Name Changed |
| 1991 | Diocese of Civita Castellana (, Orte, Gallese, Nepi e Sutri), Italy | Name Changed | Diocese of Civita Castellana, Italy | Name Changed |
| 1994 | Nunciature to Suriname, Antilles | Established | ||
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