| Regimental number | 3604 |
| Religion | Roman Catholic |
| Occupation | Plumber |
| Address | 124 Vincent Street, Leederville, Western Australia |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, Ernest Thomas O'Reilly, 124 Vincent Street, Leederville, Western Australia |
| Enlistment date | 1 October 1915 |
| Date of enlistment from Nominal Roll | 27 September 1915 |
| Rank on enlistment | Private |
| Unit name | 28th Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/45/2 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A30 Borda on 17 January 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 51st Battalion |
| Fate | Returned to Australia 7 February 1919 |