| Trecate to Octeville | 563.44 mi (906.76 km) |
| Trecate to Oignies | 437.46 mi (704.02 km) |
| Trecate to Oissel | 447.65 mi (720.43 km) |
| Trecate to Olivet | 364.82 mi (587.13 km) |
| Trecate to Ollioules | 213.28 mi (343.24 km) |
| Trecate to Olonne-sur-Mer | 509.72 mi (820.32 km) |
| Trecate to Oloron-Sainte-Marie | 486.63 mi (783.16 km) |
| Trecate to Onet Village | 309.33 mi (497.81 km) |
| Trecate to Onnaing | 416.60 mi (670.46 km) |
| Trecate to Orange | 212.16 mi (341.44 km) |
| Trecate to Orchies | 430.84 mi (693.37 km) |
| Trecate to Orleans | 365.60 mi (588.38 km) |
| Trecate to Orly | 375.68 mi (604.59 km) |
| Trecate to Ormesson-sur-Marne | 371.98 mi (598.64 km) |
| Trecate to Orsay | 381.60 mi (614.13 km) |
