| Regimental number | 525 |
| Place of birth | Glanville, South Australia |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Wilmott Street, Glanville, South Australia |
| Marital status | Single |
| Age at embarkation | 25.6 |
| Height | 5' 6.5" |
| Weight | 139 lbs |
| Next of kin | Father, William Mahoney, Wilmott Street, Glanville, South Australia |
| Previous military service | Nil (previously rejected for AIF enlistment on account of teeth) |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 43rd Battalion, C Company |
| AWM Embarkation Roll number | 23/60/1 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A19 Afric on |
| Rank from Nominal Roll | Lance Corporal |
| Unit from Nominal Roll | 43rd Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Orca', 19 February 1919; discharged (termination of period of enlistment), 13 May 1919. Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 68 |
| Place of burial | Mount Hope Cemetery, South Australia |
| Sources | NAA: B2455, MAHONEY John Joseph |