| Ondokuzmayis to Opwijk | 1,642.63 mi (2,643.55 km) |
| Ondokuzmayis to Ostend | 1,699.82 mi (2,735.60 km) |
| Ondokuzmayis to Oud-Heverlee | 1,620.18 mi (2,607.43 km) |
| Ondokuzmayis to Oud-Turnhout | 1,613.62 mi (2,596.87 km) |
| Ondokuzmayis to Oudenaarde | 1,666.14 mi (2,681.39 km) |
| Ondokuzmayis to Oudenburg | 1,695.87 mi (2,729.24 km) |
| Ondokuzmayis to Oupeye | 1,576.65 mi (2,537.38 km) |
| Ondokuzmayis to Overijse | 1,625.24 mi (2,615.57 km) |
| Ondokuzmayis to Overpelt | 1,593.82 mi (2,565.01 km) |
| Ondokuzmayis to Paal | 1,601.48 mi (2,577.34 km) |
| Ondokuzmayis to Peer | 1,590.98 mi (2,560.43 km) |
| Ondokuzmayis to Pepinster | 1,567.20 mi (2,522.16 km) |
| Ondokuzmayis to Peruwelz | 1,662.96 mi (2,676.28 km) |
| Ondokuzmayis to Perwez | 1,611.05 mi (2,592.74 km) |
| Ondokuzmayis to Philippeville | 1,617.33 mi (2,602.83 km) |
