| Regimental number | 3069 |
| Place of birth | Katanning Western Australia |
| Religion | Roman Catholic |
| Occupation | Letter carrier |
| Address | Holmesdale Road, Midland Junction, Western Australia |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Father, John J O'Mahony, Holmesdale Road, Midland Junction, Western Australia |
| Previous military service | 38th Battery Australian Field Artillery |
| Enlistment date | 8 August 1914 |
| Date of enlistment from Nominal Roll | 18 August 1914 |
| Rank on enlistment | Gunner |
| Unit name | Divisional Ammunition Column (Sept-Oct 1914) |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board Transport A7 Medic on 2 November 1914 |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 14th Field Artillery Brigade |
| Fate | Effective abroad (still overseas) |
