| Gloucester City to Opwijk | 3,730.50 mi (6,003.66 km) |
| Gloucester City to Ostend | 3,672.88 mi (5,910.92 km) |
| Gloucester City to Oud-Heverlee | 3,753.48 mi (6,040.64 km) |
| Gloucester City to Oud-Turnhout | 3,753.98 mi (6,041.44 km) |
| Gloucester City to Oudenaarde | 3,709.70 mi (5,970.19 km) |
| Gloucester City to Oudenburg | 3,677.17 mi (5,917.83 km) |
| Gloucester City to Oupeye | 3,796.27 mi (6,109.51 km) |
| Gloucester City to Overijse | 3,749.34 mi (6,033.97 km) |
| Gloucester City to Overpelt | 3,773.94 mi (6,073.57 km) |
| Gloucester City to Paal | 3,768.68 mi (6,065.11 km) |
| Gloucester City to Peer | 3,777.58 mi (6,079.44 km) |
| Gloucester City to Pepinster | 3,807.04 mi (6,126.83 km) |
| Gloucester City to Peruwelz | 3,717.30 mi (5,982.42 km) |
| Gloucester City to Perwez | 3,764.86 mi (6,058.96 km) |
| Gloucester City to Philippeville | 3,764.98 mi (6,059.15 km) |
