| Portales to Nuth | 5,160.11 mi (8,304.39 km) |
| Portales to Oegstgeest | 5,059.87 mi (8,143.08 km) |
| Portales to Oirschot | 5,116.10 mi (8,233.57 km) |
| Portales to Oisterwijk | 5,109.26 mi (8,222.57 km) |
| Portales to Oldebroek | 5,098.79 mi (8,205.72 km) |
| Portales to Oldenzaal | 5,139.48 mi (8,271.19 km) |
| Portales to Ommen | 5,113.75 mi (8,229.78 km) |
| Portales to Oosterend | 5,082.21 mi (8,179.03 km) |
| Portales to Oosterhout | 5,094.85 mi (8,199.37 km) |
| Portales to Oosterwolde | 5,090.35 mi (8,192.13 km) |
| Portales to Oostzaan | 5,064.48 mi (8,150.50 km) |
| Portales to Opmeer | 5,056.25 mi (8,137.24 km) |
| Portales to Oss | 5,112.99 mi (8,228.56 km) |
| Portales to Oud-Beijerland | 5,071.95 mi (8,162.52 km) |
| Portales to Oudenbosch | 5,085.28 mi (8,183.96 km) |
