| San Pietro in Casale to Opwijk | 546.73 mi (879.88 km) |
| San Pietro in Casale to Ostend | 596.92 mi (960.65 km) |
| San Pietro in Casale to Oud-Heverlee | 526.18 mi (846.81 km) |
| San Pietro in Casale to Oud-Turnhout | 544.49 mi (876.28 km) |
| San Pietro in Casale to Oudenaarde | 557.71 mi (897.55 km) |
| San Pietro in Casale to Oudenburg | 592.38 mi (953.34 km) |
| San Pietro in Casale to Oupeye | 493.61 mi (794.39 km) |
| San Pietro in Casale to Overijse | 527.21 mi (848.46 km) |
| San Pietro in Casale to Overpelt | 528.16 mi (849.99 km) |
| San Pietro in Casale to Paal | 524.12 mi (843.49 km) |
| San Pietro in Casale to Peer | 522.46 mi (840.81 km) |
| San Pietro in Casale to Pepinster | 481.23 mi (774.47 km) |
| San Pietro in Casale to Peruwelz | 541.73 mi (871.82 km) |
| San Pietro in Casale to Perwez | 510.88 mi (822.18 km) |
| San Pietro in Casale to Philippeville | 496.41 mi (798.89 km) |
