| Mentor to Nuth | 3,964.40 mi (6,380.08 km) |
| Mentor to Oegstgeest | 3,870.55 mi (6,229.04 km) |
| Mentor to Oirschot | 3,923.46 mi (6,314.20 km) |
| Mentor to Oisterwijk | 3,917.03 mi (6,303.84 km) |
| Mentor to Oldebroek | 3,916.54 mi (6,303.07 km) |
| Mentor to Oldenzaal | 3,959.52 mi (6,372.23 km) |
| Mentor to Ommen | 3,933.84 mi (6,330.90 km) |
| Mentor to Oosterend | 3,905.58 mi (6,285.43 km) |
| Mentor to Oosterhout | 3,902.02 mi (6,279.70 km) |
| Mentor to Oosterwolde | 3,914.36 mi (6,299.55 km) |
| Mentor to Oostzaan | 3,878.74 mi (6,242.22 km) |
| Mentor to Opmeer | 3,873.14 mi (6,233.21 km) |
| Mentor to Oss | 3,923.39 mi (6,314.08 km) |
| Mentor to Oud-Beijerland | 3,879.17 mi (6,242.92 km) |
| Mentor to Oudenbosch | 3,890.91 mi (6,261.81 km) |
