| Regimental number | 2307 |
| Place of birth | Port Fairy Victoria |
| Religion | Roman Catholic |
| Occupation | Railway shunter |
| Address | Port Fairy Post Office, Port Fairy, Victoria |
| Marital status | Single |
| Age at embarkation | 27 |
| Next of kin | Mother, Mrs Frances Costello, Port Fairy Post Office, Port Fairy, Victoria |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 57th Battalion, 4th Reinforcement |
| AWM Embarkation Roll number | 23/74/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A67 Orsova on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 58th Battalion |
| Fate | Returned to Australia |
| Other details |
War service: Western Front Embarkation Roll states name as James Leo COSTELLA |
| Date of death | |
| Place of burial | Geelong, Victoria |