| Ottaviano to Opwijk | 854.70 mi (1,375.50 km) |
| Ottaviano to Ostend | 903.97 mi (1,454.80 km) |
| Ottaviano to Oud-Heverlee | 834.36 mi (1,342.77 km) |
| Ottaviano to Oud-Turnhout | 852.83 mi (1,372.50 km) |
| Ottaviano to Oudenaarde | 864.92 mi (1,391.96 km) |
| Ottaviano to Oudenburg | 899.46 mi (1,447.54 km) |
| Ottaviano to Oupeye | 801.95 mi (1,290.62 km) |
| Ottaviano to Overijse | 835.26 mi (1,344.21 km) |
| Ottaviano to Overpelt | 836.39 mi (1,346.04 km) |
| Ottaviano to Paal | 832.48 mi (1,339.74 km) |
| Ottaviano to Peer | 830.72 mi (1,336.91 km) |
| Ottaviano to Pepinster | 789.57 mi (1,270.70 km) |
| Ottaviano to Peruwelz | 848.22 mi (1,365.08 km) |
| Ottaviano to Perwez | 818.98 mi (1,318.02 km) |
| Ottaviano to Philippeville | 803.66 mi (1,293.37 km) |
