 | 1903 | 1904 | 1905 |  |
Date | Country | Change |
| 1904.01.21 |  Papua New Guinea | Apostolic Prefecture of German Solomon Islands was renamed as Apostolic Prefecture of Northern Solomon Islands |
| 1904.01.21 |  Solomon Islands | Apostolic Prefecture of British Solomons was renamed as Apostolic Prefecture of South Solomons |
| 1904.01.21 |  Somalia | Apostolic Prefecture of Benadir was established (from Apostolic Vicariate of Northern Zanguebar) |
| 1904.01.27 |  Canada | Diocese of Joliette was established (from Metropolitan Archdiocese of Montréal and became suffragan of Montréal) |
| 1904.01.27 |  Japan | Apostolic Prefecture of Shikoku 四国 was established (from Diocese of Osaka 大阪 and became suffragan of Tokyo 東京) |
| 1904.02.08 | Canada | Diocese of Saint John’s, Newfoundland was promoted as Metropolitan Archdiocese of Saint John’s, Newfoundland (with suffragan sees Harbour Grace and Western Newfoundland) |
| 1904.02.18 | Canada | Apostolic Vicariate of Western Newfoundland was promoted as Diocese of Saint George’s |
| 1904.03.12 |  USA | Diocese of Fall River was established (from Diocese of Providence and became suffragan of Boston) |
| 1904.03.18 |  Congo-Kinshasa | Mission sui juris of Kasaï Supérieur was promoted as Apostolic Prefecture of Kasaï Supérieur |
| 1904.03.22 |  Vanuatu | Apostolic Prefecture of New Hebrides was promoted as Apostolic Vicariate of New Hebrides |
| 1904.05.12 |  Equatorial Guinea | Apostolic Prefecture of Annobon, Corisco and Fernando Poo Islands was promoted as Apostolic Vicariate of Fernando Poo |
| 1904.05.18 | USA | Diocese of Great Falls was established (from Diocese of Helena and became suffragan of Oregon City) |
| 1904.08.03 | Congo-Kinshasa | Apostolic Prefecture of Stanley Falls was established (from Apostolic Vicariate of Congo Belge) |
| 1904.09.06 | Canada | Metropolitan Archdiocese of Vancouver Island was renamed as Metropolitan Archdiocese of Victoria |
| 1904.09.14 |  Italy | Diocese of Ancona e Umana was promoted as Archdiocese of Ancona e Umana (without ecclesiastical province) |
| 1904.09.16 | Canada | Diocese of Sault Sainte Marie was established (from Diocese of Peterborough and became suffragan of Kingston) |
| 1904.09.16 |  South Africa | Apostolic Prefecture of Transvaal was promoted as Apostolic Vicariate of Transvaal |
| 1904.12.20 |  Colombia | Apostolic Prefecture of Caquetá was established (from Diocese of Pasto) |
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