| Ferentino to Opwijk | 772.40 mi (1,243.06 km) |
| Ferentino to Ostend | 820.82 mi (1,320.99 km) |
| Ferentino to Oud-Heverlee | 752.41 mi (1,210.89 km) |
| Ferentino to Oud-Turnhout | 771.94 mi (1,242.32 km) |
| Ferentino to Oudenaarde | 781.92 mi (1,258.37 km) |
| Ferentino to Oudenburg | 816.33 mi (1,313.75 km) |
| Ferentino to Oupeye | 721.06 mi (1,160.43 km) |
| Ferentino to Overijse | 753.09 mi (1,211.98 km) |
| Ferentino to Overpelt | 755.93 mi (1,216.55 km) |
| Ferentino to Paal | 751.43 mi (1,209.32 km) |
| Ferentino to Peer | 750.18 mi (1,207.30 km) |
| Ferentino to Pepinster | 708.71 mi (1,140.56 km) |
| Ferentino to Peruwelz | 764.80 mi (1,230.83 km) |
| Ferentino to Perwez | 736.92 mi (1,185.95 km) |
| Ferentino to Philippeville | 720.74 mi (1,159.93 km) |
