| Grass Valley to Oerlinghausen | 5,449.25 mi (8,769.72 km) |
| Grass Valley to Oestrich-Winkel | 5,539.38 mi (8,914.77 km) |
| Grass Valley to Offenburg | 5,621.51 mi (9,046.95 km) |
| Grass Valley to Oftersheim | 5,589.80 mi (8,995.92 km) |
| Grass Valley to Ohrdruf | 5,565.51 mi (8,956.82 km) |
| Grass Valley to Ohringen | 5,623.98 mi (9,050.91 km) |
| Grass Valley to Olbernhau | 5,639.75 mi (9,076.31 km) |
| Grass Valley to Olching | 5,728.51 mi (9,219.14 km) |
| Grass Valley to Oldenburg | 5,373.22 mi (8,647.36 km) |
| Grass Valley to Oldenburg in Holstein | 5,375.10 mi (8,650.38 km) |
| Grass Valley to Olfen | 5,429.30 mi (8,737.61 km) |
| Grass Valley to Olpe | 5,479.35 mi (8,818.16 km) |
| Grass Valley to Olsberg | 5,478.31 mi (8,816.49 km) |
| Grass Valley to Oranienburg | 5,518.07 mi (8,880.47 km) |
| Grass Valley to Ortenberg | 5,548.11 mi (8,928.83 km) |
