| Houghton Regis to Opwijk | 212.83 mi (342.51 km) |
| Houghton Regis to Ostend | 155.15 mi (249.69 km) |
| Houghton Regis to Oud-Heverlee | 235.77 mi (379.44 km) |
| Houghton Regis to Oud-Turnhout | 239.73 mi (385.81 km) |
| Houghton Regis to Oudenaarde | 192.18 mi (309.28 km) |
| Houghton Regis to Oudenburg | 159.41 mi (256.55 km) |
| Houghton Regis to Oupeye | 278.83 mi (448.73 km) |
| Houghton Regis to Overijse | 231.56 mi (372.66 km) |
| Houghton Regis to Overpelt | 259.51 mi (417.64 km) |
| Houghton Regis to Paal | 252.31 mi (406.06 km) |
| Houghton Regis to Peer | 262.42 mi (422.32 km) |
| Houghton Regis to Pepinster | 289.36 mi (465.68 km) |
| Houghton Regis to Peruwelz | 201.96 mi (325.02 km) |
| Houghton Regis to Perwez | 247.14 mi (397.73 km) |
| Houghton Regis to Philippeville | 249.80 mi (402.02 km) |
