| Greenford to Opwijk | 199.80 mi (321.54 km) |
| Greenford to Ostend | 142.49 mi (229.32 km) |
| Greenford to Oud-Heverlee | 222.45 mi (358.00 km) |
| Greenford to Oud-Turnhout | 230.15 mi (370.39 km) |
| Greenford to Oudenaarde | 177.31 mi (285.35 km) |
| Greenford to Oudenburg | 146.45 mi (235.68 km) |
| Greenford to Oupeye | 265.92 mi (427.95 km) |
| Greenford to Overijse | 217.72 mi (350.38 km) |
| Greenford to Overpelt | 249.55 mi (401.61 km) |
| Greenford to Paal | 240.95 mi (387.77 km) |
| Greenford to Peer | 251.92 mi (405.43 km) |
| Greenford to Pepinster | 275.86 mi (443.95 km) |
| Greenford to Peruwelz | 184.64 mi (297.15 km) |
| Greenford to Perwez | 232.67 mi (374.45 km) |
| Greenford to Philippeville | 232.49 mi (374.16 km) |
