| Grottaferrata to Opwijk | 751.15 mi (1,208.85 km) |
| Grottaferrata to Ostend | 798.68 mi (1,285.35 km) |
| Grottaferrata to Oud-Heverlee | 731.50 mi (1,177.24 km) |
| Grottaferrata to Oud-Turnhout | 751.95 mi (1,210.15 km) |
| Grottaferrata to Oudenaarde | 759.94 mi (1,223.01 km) |
| Grottaferrata to Oudenburg | 794.20 mi (1,278.14 km) |
| Grottaferrata to Oupeye | 701.12 mi (1,128.35 km) |
| Grottaferrata to Overijse | 731.98 mi (1,178.01 km) |
| Grottaferrata to Overpelt | 736.32 mi (1,185.00 km) |
| Grottaferrata to Paal | 731.34 mi (1,176.98 km) |
| Grottaferrata to Peer | 730.52 mi (1,175.66 km) |
| Grottaferrata to Pepinster | 688.82 mi (1,108.54 km) |
| Grottaferrata to Peruwelz | 742.40 mi (1,194.78 km) |
| Grottaferrata to Perwez | 715.91 mi (1,152.15 km) |
| Grottaferrata to Philippeville | 698.92 mi (1,124.80 km) |
