| Clay Cross to Opwijk | 281.91 mi (453.70 km) |
| Clay Cross to Ostend | 227.08 mi (365.45 km) |
| Clay Cross to Oud-Heverlee | 304.49 mi (490.03 km) |
| Clay Cross to Oud-Turnhout | 299.05 mi (481.28 km) |
| Clay Cross to Oudenaarde | 266.38 mi (428.69 km) |
| Clay Cross to Oudenburg | 231.63 mi (372.78 km) |
| Clay Cross to Oupeye | 344.93 mi (555.10 km) |
| Clay Cross to Overijse | 301.68 mi (485.51 km) |
| Clay Cross to Overpelt | 318.86 mi (513.15 km) |
| Clay Cross to Paal | 315.53 mi (507.80 km) |
| Clay Cross to Peer | 322.99 mi (519.80 km) |
| Clay Cross to Pepinster | 356.61 mi (573.90 km) |
| Clay Cross to Peruwelz | 280.84 mi (451.97 km) |
| Clay Cross to Perwez | 318.11 mi (511.95 km) |
| Clay Cross to Philippeville | 327.20 mi (526.59 km) |
