| Greenbelt to Nuth | 3,912.49 mi (6,296.55 km) |
| Greenbelt to Oegstgeest | 3,823.53 mi (6,153.38 km) |
| Greenbelt to Oirschot | 3,873.87 mi (6,234.40 km) |
| Greenbelt to Oisterwijk | 3,867.75 mi (6,224.53 km) |
| Greenbelt to Oldebroek | 3,873.25 mi (6,233.40 km) |
| Greenbelt to Oldenzaal | 3,917.10 mi (6,303.97 km) |
| Greenbelt to Ommen | 3,891.73 mi (6,263.13 km) |
| Greenbelt to Oosterend | 3,865.69 mi (6,221.23 km) |
| Greenbelt to Oosterhout | 3,852.54 mi (6,200.06 km) |
| Greenbelt to Oosterwolde | 3,874.73 mi (6,235.78 km) |
| Greenbelt to Oostzaan | 3,833.79 mi (6,169.89 km) |
| Greenbelt to Opmeer | 3,829.82 mi (6,163.49 km) |
| Greenbelt to Oss | 3,875.64 mi (6,237.24 km) |
| Greenbelt to Oud-Beijerland | 3,829.96 mi (6,163.73 km) |
| Greenbelt to Oudenbosch | 3,840.60 mi (6,180.84 km) |
