| Casteldaccia to Opwijk | 1,002.49 mi (1,613.35 km) |
| Casteldaccia to Ostend | 1,046.87 mi (1,684.78 km) |
| Casteldaccia to Oud-Heverlee | 983.94 mi (1,583.50 km) |
| Casteldaccia to Oud-Turnhout | 1,006.67 mi (1,620.07 km) |
| Casteldaccia to Oudenaarde | 1,008.96 mi (1,623.77 km) |
| Casteldaccia to Oudenburg | 1,042.50 mi (1,677.73 km) |
| Casteldaccia to Oupeye | 956.16 mi (1,538.79 km) |
| Casteldaccia to Overijse | 983.84 mi (1,583.34 km) |
| Casteldaccia to Overpelt | 991.96 mi (1,596.40 km) |
| Casteldaccia to Paal | 985.87 mi (1,586.61 km) |
| Casteldaccia to Peer | 986.06 mi (1,586.91 km) |
| Casteldaccia to Pepinster | 944.00 mi (1,519.22 km) |
| Casteldaccia to Peruwelz | 990.04 mi (1,593.32 km) |
| Casteldaccia to Perwez | 968.17 mi (1,558.12 km) |
| Casteldaccia to Philippeville | 948.78 mi (1,526.92 km) |
