| Southborough to Opwijk | 170.64 mi (274.61 km) |
| Southborough to Ostend | 115.01 mi (185.10 km) |
| Southborough to Oud-Heverlee | 192.69 mi (310.11 km) |
| Southborough to Oud-Turnhout | 204.35 mi (328.87 km) |
| Southborough to Oudenaarde | 146.55 mi (235.84 km) |
| Southborough to Oudenburg | 118.48 mi (190.67 km) |
| Southborough to Oupeye | 236.19 mi (380.11 km) |
| Southborough to Overijse | 187.48 mi (301.73 km) |
| Southborough to Overpelt | 223.08 mi (359.01 km) |
| Southborough to Paal | 213.06 mi (342.88 km) |
| Southborough to Peer | 224.85 mi (361.86 km) |
| Southborough to Pepinster | 245.48 mi (395.06 km) |
| Southborough to Peruwelz | 151.43 mi (243.70 km) |
| Southborough to Perwez | 201.68 mi (324.58 km) |
| Southborough to Philippeville | 198.93 mi (320.15 km) |
