| Date | From | To | ||
|---|---|---|---|---|
| unknown | Diocese ofAlger,Algeria Diocese ofIslas Canarias {Canary Islands},Spain | Territory Lost | Vicariate Apostolic ofTunis,Tunisia | Erected |
| unknown | Society of Saint Edmund | Founded | ||
| unknown | Diocese ofNew Brunswick,Canada | Name Changed | Diocese ofFredericton, New Brunswick,Canada | Name Changed |
| 31 Mar | Congregation of the Sons of Mary Immaculate | Decretum Laudis | ||
| 2 Jun | Diocese ofMaynas,Peru | Name Changed | Diocese ofChachapoyas,Peru | Name Changed |
| 2 Jun | Missionaries of St. Francis de Sales d’Annecy | Decretum Laudis | ||
| 11 Aug | Diocese ofPhiladelphia, Pennsylvania,USA | Territory Lost | Diocese ofPittsburgh, Pennsylvania,USA (Western Pennsylvania) | Erected |
| 3 Oct | Missionary Brothers of the Countryside | Founded | ||
| 28 Nov | Diocese ofSaint Louis, Missouri,USA Diocese ofVincennes, Indiana,USA | Territory Lost | Diocese ofChicago, Illinois,USA (State of Illinois) | Erected |
| 28 Nov | Diocese ofBoston, Massachusetts,USA | Territory Lost | Diocese ofHartford, Connecticut,USA (Connecticut and Rhode Island) | Erected |
| 28 Nov | Diocese ofSaint Louis, Missouri,USA | Territory Lost | Diocese ofLittle Rock, Arkansas,USA (State of Arkansas) | Erected |
| 28 Nov | Diocese ofDetroit, Michigan,USA | Territory Lost | Diocese ofMilwaukee, Wisconsin,USA (State of Wisconsin) | Erected |
| 1 Dec | Archdiocese ofBaltimore, Maryland,USA Archdiocese ofQuébec,Canada | Territory Lost | Vicariate Apostolic ofOregon Territory,USA (From California to Alaska, from the Rocky Mountains to the Pacific Ocean) | Erected |
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