 | 1818 | 1819 | 1820 |  |
Date | Country | Change |
| 1819.01.12 |  Canada | Diocese of Québec was promoted as Archdiocese of Québec (lost territory to establish Apostolic Vicariate of Upper Canada) |
| 1819.01.12 | Canada | Apostolic Vicariate of Upper Canada was established (from Diocese of Québec) |
| 1819.01.18 |  Italy | Diocese of Pergola was established (from Diocese of Cagli) |
| 1819.02.01 |  Spain | Diocese of San Cristóbal de La Laguna was established (from Diocese of Islas Canarias and became suffragan of Sevilla) |
| 1819.03.09 | Italy | Diocese of Adria exchanged territory with Diocese of Padova |
| 1819.03.09 | Italy | Diocese of Padova exchanged territory with Diocese of Adria |
| 1819.04.04 |  Australia,  Norfolk Island | Apostolic Prefecture of New Holland was suppressed (to Apostolic Vicariate of Cape of Good Hope and adjacent territories) |
| 1819.06.14 | Italy | Archpresbyterate nullius of Cerignola was promoted as Diocese of Cerignola (became suffragan of Benevento) |
| 1819.09.30 |  France | Metropolitan Archdiocese of Chambéry lost territory to Diocese of Lausanne |
| 1819.11.19 |  Turkiye | Titular Metropolitan See of Amasea was restored (no longer united) |
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