| Gillingham to Opwijk | 160.00 mi (257.49 km) |
| Gillingham to Ostend | 102.93 mi (165.65 km) |
| Gillingham to Oud-Heverlee | 182.58 mi (293.83 km) |
| Gillingham to Oud-Turnhout | 191.34 mi (307.93 km) |
| Gillingham to Oudenaarde | 137.34 mi (221.03 km) |
| Gillingham to Oudenburg | 106.78 mi (171.85 km) |
| Gillingham to Oupeye | 226.07 mi (363.83 km) |
| Gillingham to Overijse | 177.79 mi (286.13 km) |
| Gillingham to Overpelt | 210.52 mi (338.80 km) |
| Gillingham to Paal | 201.47 mi (324.24 km) |
| Gillingham to Peer | 212.70 mi (342.31 km) |
| Gillingham to Pepinster | 235.94 mi (379.71 km) |
| Gillingham to Peruwelz | 145.01 mi (233.37 km) |
| Gillingham to Perwez | 192.71 mi (310.13 km) |
| Gillingham to Philippeville | 192.90 mi (310.45 km) |
