| Potters Bar to Opwijk | 195.11 mi (314.00 km) |
| Potters Bar to Ostend | 137.47 mi (221.23 km) |
| Potters Bar to Oud-Heverlee | 217.96 mi (350.78 km) |
| Potters Bar to Oud-Turnhout | 223.68 mi (359.98 km) |
| Potters Bar to Oudenaarde | 173.67 mi (279.50 km) |
| Potters Bar to Oudenburg | 141.61 mi (227.90 km) |
| Potters Bar to Oupeye | 261.24 mi (420.43 km) |
| Potters Bar to Overijse | 213.53 mi (343.64 km) |
| Potters Bar to Overpelt | 243.30 mi (391.55 km) |
| Potters Bar to Paal | 235.41 mi (378.85 km) |
| Potters Bar to Peer | 245.94 mi (395.81 km) |
| Potters Bar to Pepinster | 271.53 mi (436.99 km) |
| Potters Bar to Peruwelz | 182.61 mi (293.88 km) |
| Potters Bar to Perwez | 228.87 mi (368.33 km) |
| Potters Bar to Philippeville | 230.50 mi (370.96 km) |
