| Year | From | To | ||
|---|---|---|---|---|
| 1420 | Diocese ofSuelli,Italy | Suppressed | Archdiocese ofCagliari,Italy | Territory Added |
| 1546 | Diocese ofMéxico, Federal District | Elevated | Archdiocese ofMéxico, Federal District | Elevated |
| 1546 | Diocese ofTlaxcala (Puebla de los Angeles),México (From Seville (Spain) to Mexico (Mexico)) | Metropolitan Changed | ||
| 1546 | Diocese ofSantiago de Guatemala (From Seville (Spain) to Mexico (Mexico)) | Metropolitan Changed | ||
| 1546 | Diocese ofAntequera, Oaxaca,México (From Seville (Spain) to Mexico (Mexico)) | Metropolitan Changed | ||
| 1546 | Diocese ofMichoacán,México (From Seville (Spain) to Mexico (Mexico)) | Metropolitan Changed | ||
| 1546 | Diocese ofChiapas (Ciudad Real de Chiapas),México (From Seville (Spain) to Mexico (Mexico)) | Metropolitan Changed | ||
| 1546 | Diocese ofSanto Domingo,Dominican Republic | Elevated | Archdiocese ofSanto Domingo,Dominican Republic | Elevated |
| 1546 | Diocese ofPuerto Rico (Porto Rico) (From Seville (Spain) to Santo Domngo (Dominican Republic)) | Metropolitan Changed | ||
| 1546 | Diocese ofSantiago de Cuba (From Seville (Spain) to Santo Domingo (Dominican Republic)) | Metropolitan Changed | ||
| 1546 | Diocese ofPanamá (From Sevilla (Spain) to Lima (Peru)) | Metropolitan Changed | ||
| 1546 | Diocese ofLima,Peru | Elevated | Archdiocese ofLima,Peru | Elevated |
| 1601 | Diocese ofBorgo San Donnino,Italy | Erected | ||
| 1875 | Diocese ofBoston, Massachusetts,USA | Elevated | Archdiocese ofBoston, Massachusetts,USA | Elevated |
| 1875 | Diocese ofMilwaukee, Wisconsin,USA | Elevated | Archdiocese ofMilwaukee, Wisconsin,USA | Elevated |
| 1875 | Diocese ofChicago, Illinois,USA | Territory Lost | Diocese ofPeoria, Illinois,USA (Counties of Mercer, Warren, Henderson, Hancock, McDonough, Schuyler, Knox, Fulton, Mason, Tazewell, Peoria, Stark, Marshall, Woodford, McLean, Logan, Dewitt, Livingston, Ford, Piatt, Champaign, Vermillion, and Iroquoise) | Erected |
| 1875 | Diocese ofPhiladelphia, Pennsylvania,USA | Elevated | Archdiocese ofPhiladelphia, Pennsylvania,USA | Elevated |
| 1875 | Diocese ofSanta Fe, New Mexico,USA | Elevated | Archdiocese ofSanta Fe, New Mexico,USA | Elevated |
| 1875 | Diocese ofGreen Bay, Wisconsin,USA (from Saint Louis to Milwaukee) Diocese ofLa Crosse, Wisconsin,USA (from Saint Louis to Milwaukee) Diocese ofSault Sainte Marie and Marquette, Michigan,USA (from Saint Louis to Milwaukee) Diocese ofSaint Paul, Minnesota,USA (from Saint Louis to Milwaukee) | Metropolitan Changed | ||
| 1875 | Diocese ofSaint Paul, Minnesota,USA | Territory Lost | Vicariate Apostolic ofNorthern Minnesota,USA (Northern part of Minnesota and part of Dakota) | Erected |
| 1875 | Diocese ofBurlington, Vermont,USA (from New York to Boston) Diocese ofHartford, Connecticut,USA (from New York to Boston) Diocese ofPortland, Maine,USA (from New York to Boston) Diocese ofProvidence, Rhode Island,USA (from New York to Boston) Diocese ofSpringfield in Massachusetts,USA (from New York to Boston) | Metropolitan Changed | ||
| 1875 | Diocese ofErie, Pennsylvania,USA (from Baltimore to Philadelphia) Diocese ofHarrisburg, Pennsylvania,USA (from Baltimore to Philadelphia) Diocese ofPittsburgh, Pennsylvania,USA (from Baltimore to Philadelphia) Diocese ofScranton, Pennsylvania,USA (from Baltimore to Philadelphia) | Metropolitan Changed | ||
| 1875 | Vicariate Apostolic ofArizona,USA (from Saint Louis to Santa Fe) Vicariate Apostolic ofColorado,USA (from Saint Louis to Santa Fe) | Metropolitan Changed | ||
| 1897 | Vicariate Apostolic ofNyassa,Malawi (to Vicariate Apostolic) | Elevated | ||
| 1915 | Diocese ofBisarchio o Bisarcio (Ozieri),Italy | Name Changed | Diocese ofOzieri,Italy | Name Changed |
| 1915 | Diocese ofHakodate,Japan (Hokkaido (Yesso) except Oshima, Sakhalin (part in Japan), and Kuriles) | Territory Lost | Prefecture Apostolic ofSapporo,Japan | Erected |
| 1925 | Vicariate Apostolic ofChaco,Bolivia (South of the twenty-second parallel) | Territory Lost | Prefecture Apostolic ofPilcomayo,Paraguay | Erected |
| 1930 | Diocese ofRockhampton,Australia (From Townsville on the Coast, to the Whitsunday and Burdekin regions in the South and North to Ingham and Halifax, south-west to Winton, and west to the border with the Northern Territory, with Mount Isa and several western towns and east to Palm Island) | Territory Lost | Diocese ofTownsville,Australia | Erected |
| 1948 | Prefecture Apostolic ofCook Islands,Pacific (Oceania) | Elevated | Vicariate Apostolic ofCook Islands,Pacific (Oceania) | Elevated |
| 1948 | Vicariate Apostolic ofKroonstad,South Africa (Bethlehem, Harrismith, Vrede, Frankfort, Reitz, Lindley, Senekal, Fouriesburg, Ficksburg, Clocolan, and part of Ladybrand) | Territory Lost | Vicariate Apostolic ofBethlehem,South Africa | Erected |
| 1948 | Prefecture Apostolic ofIpamu,Congo (Dem. Rep.) | Elevated | Vicariate Apostolic ofIpamu,Congo (Dem. Rep.) | Elevated |
| 1948 | Vicariate Apostolic ofOnitsha-Owerri,Nigeria | Split | Vicariate Apostolic ofOnitsha,Nigeria Vicariate Apostolic ofOwerri,Nigeria (Owerri and Owerri River) | Split |
| 1948 | Vicariate Apostolic ofKroonstad,South Africa (Latin name changed from de Kroonstad) | Name Changed | ||
| 1959 | Prefecture Apostolic ofNiamey,Niger (Dori and Fada) | Territory Lost | Prefecture Apostolic ofFada N’Gourma,Burkina Faso | Erected |
| 1965 | Archdiocese ofMorelia, Michoacán,México (Villa Escalante or Santa Clara and Villa Madero) | Territory Lost | Diocese ofTacámbaro, Michoacán,México | Territory Added |
| 1973 | Delegation toJerusalem and Palestine | Established | Nunciature toCyprus | Established |
| 1987 | Diocese ofMenevia, Wales,Great Britain (Counties of Gwynedd, Clwyd, and the District of Montgomery in the County of Powys) | Territory Lost | Diocese ofWrexham, Wales,Great Britain | Erected |
| 1996 | Diocese ofHumaitá, Amazonas,Brazil (Manicoré) | Territory Lost | Territorial Prelature ofBorba, Amazonas,Brazil | Territory Added |
| 1996 | Territorial Prelature ofBorba, Amazonas,Brazil (Apui) | Territory Lost | Diocese ofHumaitá, Amazonas,Brazil | Territory Added |
| 1996 | Diocese ofGuiratinga, Mato Grosso,Brazil (Pontal do Araguaia) Territorial Prelature ofSão Félix, Mato Grosso,Brazil (Canarana) | Territory Lost | Diocese ofBarra do Garças, Mato Grosso,Brazil | Territory Added |
| 1996 | Diocese ofBarra do Garças, Mato Grosso,Brazil (Cocalinho north of Manacuru dos Antigos river) | Territory Lost | Territorial Prelature ofSão Félix, Mato Grosso,Brazil | Territory Added |
| 2023 | Archdiocese ofOnitsha,Nigeria (Local Government Areas: Anambra West & East, Oyi, and Ayamelum) | Territory Lost | Diocese ofAguleri,Nigeria | Erected |
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