| Grass Valley to Oberkirch | 5,622.04 mi (9,047.79 km) |
| Grass Valley to Obernburg am Main | 5,578.91 mi (8,978.38 km) |
| Grass Valley to Obernkirchen | 5,444.35 mi (8,761.84 km) |
| Grass Valley to Oberschleissheim | 5,732.30 mi (9,225.25 km) |
| Grass Valley to Oberstdorf | 5,744.94 mi (9,245.60 km) |
| Grass Valley to Obertraubling | 5,707.41 mi (9,185.19 km) |
| Grass Valley to Obertshausen | 5,558.15 mi (8,944.99 km) |
| Grass Valley to Oberursel | 5,543.77 mi (8,921.84 km) |
| Grass Valley to Ochsenfurt | 5,614.04 mi (9,034.92 km) |
| Grass Valley to Ochsenhausen | 5,698.87 mi (9,171.45 km) |
| Grass Valley to Ochtrup | 5,397.71 mi (8,686.77 km) |
| Grass Valley to Odenthal | 5,459.23 mi (8,785.78 km) |
| Grass Valley to Oelde | 5,443.13 mi (8,759.86 km) |
| Grass Valley to Oelsnitz | 5,625.05 mi (9,052.64 km) |
| Grass Valley to Oer-Erkenschwick | 5,429.82 mi (8,738.45 km) |
