| Gloucester to Opwijk | 283.74 mi (456.63 km) |
| Gloucester to Ostend | 226.18 mi (364.00 km) |
| Gloucester to Oud-Heverlee | 306.50 mi (493.27 km) |
| Gloucester to Oud-Turnhout | 312.42 mi (502.80 km) |
| Gloucester to Oudenaarde | 261.64 mi (421.07 km) |
| Gloucester to Oudenburg | 230.26 mi (370.56 km) |
| Gloucester to Oupeye | 349.89 mi (563.09 km) |
| Gloucester to Overijse | 301.90 mi (485.87 km) |
| Gloucester to Overpelt | 332.09 mi (534.45 km) |
| Gloucester to Paal | 324.26 mi (521.85 km) |
| Gloucester to Peer | 334.79 mi (538.79 km) |
| Gloucester to Pepinster | 360.01 mi (579.38 km) |
| Gloucester to Peruwelz | 268.90 mi (432.75 km) |
| Gloucester to Perwez | 316.99 mi (510.14 km) |
| Gloucester to Philippeville | 316.68 mi (509.65 km) |
