| Portchester to Nuth | 305.24 mi (491.23 km) |
| Portchester to Oegstgeest | 257.40 mi (414.24 km) |
| Portchester to Oirschot | 281.72 mi (453.38 km) |
| Portchester to Oisterwijk | 278.20 mi (447.73 km) |
| Portchester to Oldebroek | 320.66 mi (516.06 km) |
| Portchester to Oldenzaal | 360.26 mi (579.78 km) |
| Portchester to Ommen | 342.80 mi (551.68 km) |
| Portchester to Oosterend | 340.49 mi (547.97 km) |
| Portchester to Oosterhout | 264.30 mi (425.35 km) |
| Portchester to Oosterwolde | 348.77 mi (561.30 km) |
| Portchester to Oostzaan | 279.82 mi (450.32 km) |
| Portchester to Opmeer | 289.41 mi (465.77 km) |
| Portchester to Oss | 293.60 mi (472.50 km) |
| Portchester to Oud-Beijerland | 247.58 mi (398.43 km) |
| Portchester to Oudenbosch | 249.59 mi (401.68 km) |
