 | 1819 | 1820 | 1821 |  |
Date | Country | Change |
| 1820 |  India | Apostolic Vicariate of Great Mogul was renamed as Apostolic Vicariate of Bombay |
| 1820 | India | Mission sui juris of Hindustan was promoted as Apostolic Vicariate of Tibet-Hindustan |
| 1820 |  Palestine | Diocese of Nablus (Maronite Rite) was suppressed |
| 1820.02.01 |  Canada | Archdiocese of Québec lost territory to Apostolic Vicariate of Newfoundland |
| 1820.07.11 |  USA | Diocese of Charleston was established (from Metropolitan Archdiocese of Baltimore and became suffragan of Baltimore) |
| 1820.07.11 | USA | Diocese of Richmond was established (from Metropolitan Archdiocese of Baltimore and became suffragan of Baltimore) |
| 1820.12.14 |  Italy | Diocese of Alife was restored (from Diocese of Telese) |
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