| Portes-les-Valence to Novi di Modena | 294.87 mi (474.55 km) |
| Portes-les-Valence to Novi Ligure | 191.74 mi (308.58 km) |
| Portes-les-Valence to Nuoro | 387.81 mi (624.13 km) |
| Portes-les-Valence to Occhiobello | 328.08 mi (528.00 km) |
| Portes-les-Valence to Oderzo | 375.10 mi (603.67 km) |
| Portes-les-Valence to Oggiono | 226.19 mi (364.01 km) |
| Portes-les-Valence to Olbia | 359.74 mi (578.95 km) |
| Portes-les-Valence to Oleggio | 189.54 mi (305.03 km) |
| Portes-les-Valence to Olgiate Comasco | 208.37 mi (335.34 km) |
| Portes-les-Valence to Olgiate Olona | 201.82 mi (324.80 km) |
| Portes-les-Valence to Omegna | 184.86 mi (297.51 km) |
| Portes-les-Valence to Opera | 214.46 mi (345.14 km) |
| Portes-les-Valence to Oppeano | 308.99 mi (497.28 km) |
| Portes-les-Valence to Orbassano | 130.44 mi (209.92 km) |
| Portes-les-Valence to Orbetello | 358.46 mi (576.89 km) |
