| Gloucester to Octeville | 156.81 mi (252.37 km) |
| Gloucester to Oignies | 246.49 mi (396.69 km) |
| Gloucester to Oissel | 227.49 mi (366.11 km) |
| Gloucester to Olivet | 332.27 mi (534.73 km) |
| Gloucester to Ollioules | 710.40 mi (1,143.27 km) |
| Gloucester to Olonne-sur-Mer | 368.76 mi (593.47 km) |
| Gloucester to Oloron-Sainte-Marie | 603.86 mi (971.82 km) |
| Gloucester to Onet Village | 563.82 mi (907.39 km) |
| Gloucester to Onnaing | 273.02 mi (439.39 km) |
| Gloucester to Orange | 624.89 mi (1,005.66 km) |
| Gloucester to Orchies | 256.35 mi (412.56 km) |
| Gloucester to Orleans | 330.22 mi (531.44 km) |
| Gloucester to Orly | 297.15 mi (478.21 km) |
| Gloucester to Ormesson-sur-Marne | 299.47 mi (481.95 km) |
| Gloucester to Orsay | 293.41 mi (472.19 km) |
