[Source: Descriptive Rolls of 91st PA; National Archives and Record Administration]
[related page: officers in the 91st PA (Official Army Register)
[This page has a card on it, including the statement, "ONLY THE DESCRIPTIVE LIST HAS BEEN CARDED FROM THIS BOOK"]
List of Commissioned Officers.
| Names | Rank | Date of Appointment | Remarks. |
| Peter D. Keyser | Capt | Sept 21st 1861 | Resigned |
| James E Sulger | Capt | Augst 15th 1862 | Resigned |
| Joseph Gilbert | Capt | Oct 10th 1864 | Promoted from 1st Sergt |
| James E Sulger | 1st Lieut | Sept 21st 1861 | Promoted to Captain |
| Theo H Parsons | 1st Lieut | Augst 15th /62 | |
| James Delavan | 1st Lieut | Dec 22 /62 | Promoted from 1st Sergt |
| Joseph Everhart | 1st Lieut | Oct [?] 10th /64 | |
| Theo H. Parsons | 2nd Lieut | Sept 21st 1861 | Promoted to 1st Lieutenant |
| John Sage | 2nd Lieut | Aug 15th [?] /62 [?] | Resigned December 22nd /62 [?] |
| Edward J. Maguigan | 2nd Lieut | Dec 22 /62 | Promoted from Sergt |