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Date: 29 August 1904
Final
| Rank | Name | Nation | Time |
| 1 | Harry Hillman | USA | 49.2 |
| 2 | Frank Waller | USA | 49.9 |
| 3 | Herman Groman | USA | 50.0 |
| 4 | Joseph Fleming | USA | |
| 5 | Meyer Prinstein | USA | |
| 6 | George Poage | USA | |
| Rank unknown | |||
| Clyde Blair | USA | ||
| Percival Molson | CAN | ||
| Paul Pilgrim | USA | ||
| Johannes Runge | GER | ||
| George Underwood | USA | ||
| Howard Valentine | USA | ||