| Date | Country | Change |
| 1849.03.04 | Archdiocese of Hama (Greek-Melkite Rite) was suppressed (to Metropolitan Archdiocese of Homs and united to Diocese of Homs) | |
| 1849.03.04 | Diocese of Homs (Greek-Melkite Rite) was promoted as Metropolitan Archdiocese of Homs (gained territory from the suppressed Archdiocese of Hama and Diocese of Jabrud and gained title of Jabrud and Hama) | |
| 1849.03.04 | Diocese of Jabrud (Greek-Melkite Rite) was suppressed (to Metropolitan Archdiocese of Homs and united to Diocese of Homs) | |
| 1849.11.20 | Diocese of California was suppressed (to establish Diocese of Monterey) | |
| 1849.11.20 | Diocese of Monterey was established (from the suppressed Diocese of California and without ecclesiastical province) | |
| 1849.12.16 | Diocese of Caiazzo was restored (from Diocese of Caserta and became suffragan of Capua) |
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