 | 1873 | 1874 | 1875 |  |
Date | Country | Change |
| 1874 |  Spain | Diocese of Vic lost territory to Diocese of Barcelona |
| 1874.01.20 |  Mexico | Apostolic Vicariate of California Inferiore was established (from Metropolitan Archdiocese of México and became suffragan of México) |
| 1874.01.25 |  Canada | Apostolic Vicariate of Northern Canada was established (from Diocese of Kingston and became suffragan of Toronto) |
| 1874.03.30 |  Australia | Diocese of Ballarat was established (from Diocese of Melbourne and became suffragan of Melbourne) |
| 1874.03.30 | Australia | Diocese of Melbourne was promoted as Metropolitan Archdiocese of Melbourne (with suffragan sees Adelaide, Ballarat, Perth and Sandhurst and lost territory to establish Diocese of Ballarat and Diocese of Sandhurst) |
| 1874.03.30 | Australia | Diocese of Sandhurst was established (from Diocese of Melbourne and became suffragan of Melbourne) |
| 1874.07.10 |  France | Diocese of Metz exchanged territory with Diocese of Nancy |
| 1874.07.10 | France | Diocese of Nancy exchanged territory with Diocese of Metz |
| 1874.07.10 | France | Diocese of Saint-Dié lost territory to Diocese of Strasbourg |
| 1874.07.10 | France | Diocese of Strasbourg lost territory to Metropolitan Archdiocese of Besançon |
| 1874.08.01 |  Italy | Diocese of Asti lost territory to Diocese of Casale Monferrato |
| 1874.08.01 | Italy | Metropolitan Archdiocese of Vercelli lost territory to Diocese of Casale Monferrato |
| 1874.08.11 |  South Africa | Apostolic Prefecture of Cape of Good Hope, Central District was established (from Apostolic Vicariate of Cape of Good Hope, Western District) |
| 1874.08.28 | Canada | Diocese of Sherbrooke was established (from Metropolitan Archdiocese of Québec, Diocese of Saint-Hyacinthe and Diocese of Trois-Rivières and became suffragan of Québec) |
| 1874.08.28 |  Greece | Diocese of Crete was restored (from Apostolic Vicariate of Constantinopole and became suffragan of Izmir) |
| 1874.08.28 |  USA | Apostolic Vicariate of Brownsville was established (from Diocese of Galveston) |
| 1874.08.28 | USA | Diocese of San Antonio was established (from Diocese of Galveston and became suffragan of New Orleans) |
| 1874.10.04 |  Hong Kong | Apostolic Prefecture of Hong Kong 香港 was promoted as Apostolic Vicariate of Hong Kong 香港 |
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