| Portes-les-Valence to Oria | 713.84 mi (1,148.81 km) |
| Portes-les-Valence to Oristano | 392.00 mi (630.86 km) |
| Portes-les-Valence to Orta Nova | 598.26 mi (962.81 km) |
| Portes-les-Valence to Orte | 410.48 mi (660.61 km) |
| Portes-les-Valence to Ortona | 506.94 mi (815.85 km) |
| Portes-les-Valence to Orvieto | 390.11 mi (627.82 km) |
| Portes-les-Valence to Orzinuovi | 249.10 mi (400.89 km) |
| Portes-les-Valence to Osimo | 436.94 mi (703.19 km) |
| Portes-les-Valence to Ospitaletto | 257.25 mi (414.01 km) |
| Portes-les-Valence to Ostuni | 703.79 mi (1,132.64 km) |
| Portes-les-Valence to Ottaviano | 559.56 mi (900.53 km) |
| Portes-les-Valence to Ovada | 185.66 mi (298.79 km) |
| Portes-les-Valence to Ozieri | 362.74 mi (583.78 km) |
| Portes-les-Valence to Paceco | 619.61 mi (997.17 km) |
| Portes-les-Valence to Pachino | 775.69 mi (1,248.35 km) |
