| Grass Valley to Nuth | 5,431.92 mi (8,741.83 km) |
| Grass Valley to Oegstgeest | 5,325.72 mi (8,570.91 km) |
| Grass Valley to Oirschot | 5,384.75 mi (8,665.92 km) |
| Grass Valley to Oisterwijk | 5,377.58 mi (8,654.37 km) |
| Grass Valley to Oldebroek | 5,350.35 mi (8,610.56 km) |
| Grass Valley to Oldenzaal | 5,384.93 mi (8,666.21 km) |
| Grass Valley to Ommen | 5,360.52 mi (8,626.92 km) |
| Grass Valley to Oosterend | 5,325.19 mi (8,570.06 km) |
| Grass Valley to Oosterhout | 5,364.97 mi (8,634.09 km) |
| Grass Valley to Oosterwolde | 5,331.82 mi (8,580.73 km) |
| Grass Valley to Oostzaan | 5,323.88 mi (8,567.95 km) |
| Grass Valley to Opmeer | 5,311.58 mi (8,548.16 km) |
| Grass Valley to Oss | 5,376.47 mi (8,652.59 km) |
| Grass Valley to Oud-Beijerland | 5,343.20 mi (8,599.05 km) |
| Grass Valley to Oudenbosch | 5,358.62 mi (8,623.87 km) |
