| Trier to Octeville | 370.21 mi (595.79 km) |
| Trier to Oignies | 168.94 mi (271.88 km) |
| Trier to Oissel | 250.38 mi (402.94 km) |
| Trier to Olivet | 252.19 mi (405.86 km) |
| Trier to Ollioules | 458.77 mi (738.31 km) |
| Trier to Olonne-sur-Mer | 446.82 mi (719.09 km) |
| Trier to Oloron-Sainte-Marie | 569.11 mi (915.90 km) |
| Trier to Onet Village | 418.23 mi (673.08 km) |
| Trier to Onnaing | 141.81 mi (228.23 km) |
| Trier to Orange | 397.66 mi (639.97 km) |
| Trier to Orchies | 158.46 mi (255.02 km) |
| Trier to Orleans | 250.42 mi (403.01 km) |
| Trier to Orly | 203.96 mi (328.24 km) |
| Trier to Ormesson-sur-Marne | 196.73 mi (316.61 km) |
| Trier to Orsay | 213.82 mi (344.12 km) |
