| Ondokuzmayis to Oerlinghausen | 1,473.49 mi (2,371.35 km) |
| Ondokuzmayis to Oestrich-Winkel | 1,464.67 mi (2,357.16 km) |
| Ondokuzmayis to Offenburg | 1,447.67 mi (2,329.80 km) |
| Ondokuzmayis to Oftersheim | 1,429.82 mi (2,301.08 km) |
| Ondokuzmayis to Ohrdruf | 1,364.11 mi (2,195.32 km) |
| Ondokuzmayis to Ohringen | 1,387.01 mi (2,232.18 km) |
| Ondokuzmayis to Olbernhau | 1,253.43 mi (2,017.21 km) |
| Ondokuzmayis to Olching | 1,291.49 mi (2,078.45 km) |
| Ondokuzmayis to Oldenburg | 1,518.73 mi (2,444.16 km) |
| Ondokuzmayis to Oldenburg in Holstein | 1,451.37 mi (2,335.75 km) |
| Ondokuzmayis to Olfen | 1,520.59 mi (2,447.16 km) |
| Ondokuzmayis to Olpe | 1,488.79 mi (2,395.97 km) |
| Ondokuzmayis to Olsberg | 1,468.06 mi (2,362.61 km) |
| Ondokuzmayis to Oranienburg | 1,316.64 mi (2,118.92 km) |
| Ondokuzmayis to Ortenberg | 1,425.25 mi (2,293.72 km) |
