| Frosinone to Opwijk | 778.01 mi (1,252.09 km) |
| Frosinone to Ostend | 826.54 mi (1,330.18 km) |
| Frosinone to Oud-Heverlee | 757.98 mi (1,219.85 km) |
| Frosinone to Oud-Turnhout | 777.40 mi (1,251.10 km) |
| Frosinone to Oudenaarde | 787.61 mi (1,267.54 km) |
| Frosinone to Oudenburg | 822.04 mi (1,322.94 km) |
| Frosinone to Oupeye | 726.51 mi (1,169.21 km) |
| Frosinone to Overijse | 758.69 mi (1,220.99 km) |
| Frosinone to Overpelt | 761.34 mi (1,225.26 km) |
| Frosinone to Paal | 756.91 mi (1,218.13 km) |
| Frosinone to Peer | 755.60 mi (1,216.02 km) |
| Frosinone to Pepinster | 714.16 mi (1,149.33 km) |
| Frosinone to Peruwelz | 770.54 mi (1,240.07 km) |
| Frosinone to Perwez | 742.50 mi (1,194.94 km) |
| Frosinone to Philippeville | 726.43 mi (1,169.07 km) |
