| Year | From | To | ||
|---|---|---|---|---|
| 1439 | Diocese of Connor, Ireland
Diocese of Down, Ireland | United | Diocese of Down and Connor, Ireland | United |
| 1850 | Diocese of Oregon City, Oregon, USA | Elevated | Archdiocese of Oregon City, Oregon, USA | Elevated |
| 1853 | Archdiocese of New Orleans, Louisiana, USA | Territory Lost | Diocese of Natchitoches, Louisiana, USA | Erected |
| 1853 | Archdiocese of New York, New York, USA | Territory Lost | Diocese of Brooklyn, New York, USA | Erected |
| 1853 | Diocese of Boston, Massachusetts, USA | Territory Lost | Diocese of Burlington, Vermont, USA | Erected |
| 1853 | Diocese of Louisville, Kentucky, USA | Territory Lost | Diocese of Covington, Kentucky, USA | Erected |
| 1853 | Diocese of Pittsburgh, Pennsylvania, USA | Territory Lost | Diocese of Erie, Pennsylvania, USA | Erected |
| 1853 | Archdiocese of New York, New York, USA
Diocese of Philadelphia, Pennsylvania, USA | Territory Lost | Diocese of Newark, New Jersey, USA | Erected |
| 1853 | Diocese of Boston, Massachusetts, USA | Territory Lost | Diocese of Portland, Maine, USA | Erected |
| 1853 | Diocese of Monterey, California, USA | Territory Lost | Archdiocese of San Francisco, California, USA | Erected |
| 1853 | Diocese of Chicago, Illinois, USA | Territory Lost | Diocese of Quincy, Illinois, USA | Erected |
| 1853 | Diocese of Walla Walla, Oregon, USA | Territory Added | ||
| 1853 | Diocese of Detroit, Michigan, USA | Territory Lost | Vicariate Apostolic of Upper Michigan, USA | Erected |
| 1853 | Diocese of Monterey, California, USA (to San Francisco) | Metropolitan Changed | ||
| 1868 | Prefecture Apostolic of Schlewig-Holstein, Germany | Erected | ||
| 1880 | Archdiocese of Santafé en Nueva Granada, Colombia | Territory Lost | Diocese of Tunja, Colombia | Erected |
| 1956 | Eparchy of Changanacherry (Syro-Malabarese), India | Elevated | Archeparchy of Changanacherry (Syro-Malabarese), India | Elevated |
| 1956 | Archdiocese of Ernakulam (Syro-Malabarese), India | Territory Lost | Diocese of Kothamangalam (Syro-Malabarese), India | Erected |
| 1968 | Diocese of Amravati, India
Archdiocese of Nagpur, India | Territory Lost | Apostolic Exarchate of Chanda (Syro-Malabarese), India | Erected |
| 1968 | Archiepiscopal Exarchate of Sagar (Syro-Malabarese), India | Erected | ||
| 1968 | Diocese of Jabalpur, India | Territory Lost | Archiepiscopal Exarchate of Satna (Syro-Malabarese), India | Erected |
| 1968 | Diocese of Indore, India | Territory Lost | Apostolic Exarchate of Ujjain (Syro-Malabarese), India | Erected |
| 1976 | Diocese of Vila Cabral, Mozambique | Name Changed | Diocese of Lichinga, Mozambique | Name Changed |
| 1980 | Diocese of Mobile, Alabama, USA | Elevated | Archdiocese of Mobile, Alabama, USA | Elevated |
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