 | 1828 | 1829 | 1830 |  |
Date | Country | Change |
| 1829 |  Italy | Diocese of Novara exchanged territory with Diocese of Vigevano |
| 1829 | Italy | Diocese of Vigevano exchanged territory with Diocese of Novara |
| 1829 |  Mauritius,  British Indian Ocean Territory | Apostolic Vicariate of Cape of Good Hope and adjacent territories lost territory to Apostolic Prefecture of Bourbon |
| 1829.05.15 |  USA | Apostolic Vicariate of Alabama and the Floridas was promoted as Diocese of Mobile (became suffragan of Baltimore) |
| 1829.08.11 |  Canada | Diocese of Charlottetown was established (from Archdiocese of Québec) |
| 1829.09.04 | Canada | Archdiocese of Québec lost territory to Apostolic Vicariate of Nova Scotia |
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