| Regimental number | 1703 |
| Place of birth | Coonamble New South Wales |
| Religion | Roman Catholic |
| Occupation | Horse breaker |
| Address | Floyd Street, Coonamble, New South Wales |
| Marital status | Single |
| Age at embarkation | 25 |
| Next of kin | Mother, Mrs Teresa McMahon, Floyd Street, Coonamble, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 53rd Battalion, 2nd Reinforcement |
| AWM Embarkation Roll number | 23/70/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A40 Ceramic on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 56th Battalion |
| Fate | Returned to Australia |
| Family/military connections | Brother: 2752 2nd Corporal Michael McMAHON, ANZ Police, Egypt, returned to Australia, 3 July 1919. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |