| Greenbelt to Opwijk | 3,842.60 mi (6,184.07 km) |
| Greenbelt to Ostend | 3,784.99 mi (6,091.35 km) |
| Greenbelt to Oud-Heverlee | 3,865.58 mi (6,221.05 km) |
| Greenbelt to Oud-Turnhout | 3,865.91 mi (6,221.58 km) |
| Greenbelt to Oudenaarde | 3,821.87 mi (6,150.71 km) |
| Greenbelt to Oudenburg | 3,789.29 mi (6,098.27 km) |
| Greenbelt to Oupeye | 3,908.34 mi (6,289.86 km) |
| Greenbelt to Overijse | 3,861.46 mi (6,214.42 km) |
| Greenbelt to Overpelt | 3,885.87 mi (6,253.71 km) |
| Greenbelt to Paal | 3,880.69 mi (6,245.36 km) |
| Greenbelt to Peer | 3,889.54 mi (6,259.61 km) |
| Greenbelt to Pepinster | 3,919.13 mi (6,307.23 km) |
| Greenbelt to Peruwelz | 3,829.56 mi (6,163.09 km) |
| Greenbelt to Perwez | 3,877.01 mi (6,239.44 km) |
| Greenbelt to Philippeville | 3,877.26 mi (6,239.84 km) |
