 | 1874 | 1875 | 1876 |  |
Date | Country | Change |
| 1875.02.12 |  USA | Diocese of Boston was promoted as Metropolitan Archdiocese of Boston (with suffragan sees Burlington, Portland in Maine and Springfield in Massachusetts) |
| 1875.02.12 | USA | Diocese of Milwaukee was promoted as Metropolitan Archdiocese of Milwaukee (with suffragan sees Green Bay, La Crosse and Sault Sainte Marie–Marquette) |
| 1875.02.12 | USA | Apostolic Vicariate of Northern Minnesota was established (from Diocese of Saint Paul) |
| 1875.02.12 | USA | Diocese of Peoria was established (from Diocese of Chicago and became suffragan of Baltimore) |
| 1875.02.12 | USA | Diocese of Philadelphia was promoted as Metropolitan Archdiocese of Philadelphia (with suffragan sees Erie, Harrisburg, Pittsburgh and Scranton) |
| 1875.02.12 | USA | Diocese of Santa Fe was promoted as Metropolitan Archdiocese of Santa Fe |
| 1875.03.18 |  Poland | Diocese of Chełm–Bełz (Ukrainian Rite) was suppressed |
| 1875.04.16 |  Colombia | Diocese of Medellín lost territory to Diocese of Antioquía |
| 1875.07.23 |  Greece | Archdiocese of Athens was restored (without ecclesiastical province) |
| 1875.08.06 |  China | Apostolic Vicariate of Guangdong-Guangxi 兩廣 was renamed as Apostolic Vicariate of Guangdong 廣東 (lost territory to establish Apostolic Prefecture of Guangxi 廣西) |
| 1875.08.06 | China | Apostolic Prefecture of Guangxi 廣西 was established (from Apostolic Vicariate of Guangdong-Guangxi 兩廣) |
| 1875.11.18 |  Spain | Priory nullius of Ciudad Real was established (from Metropolitan Archdiocese of Toledo and Diocese of Córdoba and without ecclesiastical province) |
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