| South Riding to Oerlinghausen | 4,022.49 mi (6,473.57 km) |
| South Riding to Oestrich-Winkel | 4,052.16 mi (6,521.32 km) |
| South Riding to Offenburg | 4,094.41 mi (6,589.31 km) |
| South Riding to Oftersheim | 4,094.26 mi (6,589.07 km) |
| South Riding to Ohrdruf | 4,136.44 mi (6,656.96 km) |
| South Riding to Ohringen | 4,136.54 mi (6,657.11 km) |
| South Riding to Olbernhau | 4,242.96 mi (6,828.39 km) |
| South Riding to Olching | 4,241.64 mi (6,826.27 km) |
| South Riding to Oldenburg | 3,972.56 mi (6,393.21 km) |
| South Riding to Oldenburg in Holstein | 4,040.57 mi (6,502.68 km) |
| South Riding to Olfen | 3,979.27 mi (6,404.01 km) |
| South Riding to Olpe | 4,016.48 mi (6,463.91 km) |
| South Riding to Olsberg | 4,032.75 mi (6,490.08 km) |
| South Riding to Oranienburg | 4,173.64 mi (6,716.82 km) |
| South Riding to Ortenberg | 4,084.13 mi (6,572.78 km) |
