 | 1841 | 1842 | 1843 |  |
Date | Country | Change |
| 1842 |  Turkiye | Diocese of Marasc (Armenian Rite) was established |
| 1842.01.22 |  Gabon | Apostolic Prefecture of Deux Guinées et Sénégambie was established (from Diocese of Funchal and Diocese of Tomé) |
| 1842.02.15 |  Canada | Apostolic Vicariate of Nova Scotia was promoted as Diocese of Halifax |
| 1842.04.05 |  Australia | Apostolic Vicariate of Adelaide was established (from Apostolic Vicariate of New Holland and Van Diemen’s Land) |
| 1842.04.05 | Australia | Apostolic Vicariate of Hobart was established (from Apostolic Vicariate of New Holland and Van Diemen’s Land) |
| 1842.04.05 | Australia,  Norfolk Island | Apostolic Vicariate of New Holland and Van Diemen’s Land was renamed as Apostolic Vicariate of Sydney (lost territory to establish Apostolic Vicariate of Adelaide and Apostolic Vicariate of Hobart) |
| 1842.04.22 | Australia | Apostolic Vicariate of Adelaide was promoted as Diocese of Adelaide (became suffragan of Sydney) |
| 1842.04.22 | Australia | Apostolic Vicariate of Hobart was promoted as Diocese of Hobart (became suffragan of Sydney) |
| 1842.04.22 | Australia, Norfolk Island | Apostolic Vicariate of Sydney was promoted as Metropolitan Archdiocese of Sydney (with suffragan sees Adelaide and Hobart) |
| 1842.05.18 |  Belgium | Diocese of Liège exchanged territory with Diocese of Namur |
| 1842.05.18 | Belgium | Diocese of Namur exchanged territory with Diocese of Liège |
| 1842.08.23 |  New Zealand | Apostolic Vicariate of Western Oceania was renamed as Apostolic Vicariate of New Zealand (lost territory to establish Apostolic Vicariate of Central Oceania) |
| 1842.08.23 |  Tonga | Apostolic Vicariate of Central Oceania was established (from Apostolic Vicariate of Western Oceania) |
| 1842.08.30 | Turkiye | Apostolic Prefecture of Mardin was established (from Apostolic Prefecture of Syria and Cilicia) |
| 1842.09.12 |  Suriname | Apostolic Prefecture of Dutch Guyana–Suriname was promoted as Apostolic Vicariate of Dutch Guyana–Suriname |
| 1842.09.20 |  Curaçao,  Aruba,  Bonaire, Sint Eustatius and Saba,  Sint Maarten | Apostolic Prefecture of Curaçao was promoted as Apostolic Vicariate of Curaçao |
| 1842.09.28 |  El Salvador | Diocese of San Salvador was established (from Metropolitan Archdiocese of Guatemala and became suffragan of Guatemala) |
| 1842.09.30 | Canada | Diocese of Saint John in America was established (from Diocese of Charlottetown) |
| 1842.10.03 | Gabon | Apostolic Prefecture of Deux Guinées et Sénégambie was promoted as Apostolic Vicariate of Deux Guinées et Sénégambie |
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