 
 
| Date | Event | From | To | 
|---|---|---|---|
| 11 January 1876 | Erected | Diocese of Pittsburgh | Diocese of Allegheny (erected) (Counties of Huntingdon, Blair, Bedford, Cambria, Indiana, Westmorland, Butler, Armstrong, and part of Allegheny) | 
| 1 July 1889 | Suppressed | Diocese of Allegheny (suppressed) | Diocese of Pittsburgh | 
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