| Date | Country | Change |
| 1804 | Metropolitan Archdiocese of Toulouse lost territory to Diocese of Urgell | |
| 1804.08.09 | Diocese of Eger was promoted as Metropolitan Archdiocese of Eger (with suffragan sees Košice, Rožňava, Satu Mare and Spiš and lost territory to establish Diocese of Košice and Diocese of Satu Mare) | |
| 1804.08.09 | Diocese of Satu Mare was established (from Diocese of Eger and became suffragan of Eger) | |
| 1804.08.09 | Diocese of Košice was established (from Diocese of Eger and became suffragan of Eger) | |
| 1804.08.31 | Diocese of Antioquía was established (from Metropolitan Archdiocese of Santafé en Nueva Granada, Diocese of Cartagena and Diocese of Popayán and became suffragan of Santafé en Nueva Granada) |
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