| Trets to Octeville | 550.51 mi (885.96 km) |
| Trets to Oignies | 501.44 mi (806.99 km) |
| Trets to Oissel | 462.21 mi (743.85 km) |
| Trets to Olivet | 355.64 mi (572.35 km) |
| Trets to Ollioules | 22.74 mi (36.59 km) |
| Trets to Olonne-sur-Mer | 422.09 mi (679.29 km) |
| Trets to Oloron-Sainte-Marie | 316.71 mi (509.70 km) |
| Trets to Onet Village | 166.49 mi (267.94 km) |
| Trets to Onnaing | 489.53 mi (787.83 km) |
| Trets to Orange | 64.74 mi (104.19 km) |
| Trets to Orchies | 498.96 mi (803.00 km) |
| Trets to Orleans | 357.69 mi (575.65 km) |
| Trets to Orly | 398.45 mi (641.24 km) |
| Trets to Ormesson-sur-Marne | 398.41 mi (641.17 km) |
| Trets to Orsay | 399.59 mi (643.08 km) |
