| Castellana Grotte to Opwijk | 932.56 mi (1,500.81 km) |
| Castellana Grotte to Ostend | 985.25 mi (1,585.61 km) |
| Castellana Grotte to Oud-Heverlee | 910.97 mi (1,466.06 km) |
| Castellana Grotte to Oud-Turnhout | 925.04 mi (1,488.71 km) |
| Castellana Grotte to Oudenaarde | 945.90 mi (1,522.28 km) |
| Castellana Grotte to Oudenburg | 980.69 mi (1,578.27 km) |
| Castellana Grotte to Oupeye | 874.82 mi (1,407.88 km) |
| Castellana Grotte to Overijse | 912.77 mi (1,468.96 km) |
| Castellana Grotte to Overpelt | 907.19 mi (1,459.99 km) |
| Castellana Grotte to Paal | 905.51 mi (1,457.28 km) |
| Castellana Grotte to Peer | 901.85 mi (1,451.39 km) |
| Castellana Grotte to Pepinster | 862.48 mi (1,388.03 km) |
| Castellana Grotte to Peruwelz | 931.36 mi (1,498.89 km) |
| Castellana Grotte to Perwez | 896.26 mi (1,442.39 km) |
| Castellana Grotte to Philippeville | 884.87 mi (1,424.06 km) |
