 | 1807 | 1808 | 1809 |  |
Date | Country | Change |
| 1808 |  Germany | Metropolitan Archdiocese of Köln lost territory to Diocese of Aachen |
| 1808.04.08 |  USA | Diocese of Baltimore was promoted as Metropolitan Archdiocese of Baltimore (with suffragan sees Bardstown, Boston, New York and Philadelphia and lost territory to establish Diocese of Bardstown, Diocese of Boston, Diocese of New York and Diocese of Philadelphia) |
| 1808.04.08 | USA | Diocese of Bardstown was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.08 | USA | Diocese of Boston was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.08 | USA | Diocese of New York was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.08 | USA | Diocese of Philadelphia was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.26 | Germany | Diocese of Konstanz lost territory to Diocese of Strasbourg |
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