| Regimental number | 1720 |
| Place of birth | Wentworth Falls New South Wales |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Cox's Creek via Picton, New South Wales |
| Marital status | Single |
| Age at embarkation | 23 |
| Next of kin | Mother, Mrs Kate McMahon, Strathmore, Cox's River via Picton, New South Wales |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 1st Light Horse Regiment, 12th Reinforcement |
| AWM Embarkation Roll number | 10/6/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A72 Beltana on |
| Rank from Nominal Roll | Bombardier |
| Unit from Nominal Roll | 5th Divisional Ammunition Column |
| Fate | Returned to Australia |
| Family/military connections | Brother: 2606 Pte Oswald McMAHON, 39th Bn, returned to Australia, 10 January 1918. |
| Other details |
War service: Egypt, Western Front Medals: 1914-15 Star, British War Medal, Victory Medal |
| Date of death | |
| Place of burial | Camden Cemetery |