| Montalegre to Opwijk | 849.21 mi (1,366.66 km) |
| Montalegre to Ostend | 823.66 mi (1,325.56 km) |
| Montalegre to Oud-Heverlee | 858.50 mi (1,381.62 km) |
| Montalegre to Oud-Turnhout | 891.07 mi (1,434.04 km) |
| Montalegre to Oudenaarde | 825.33 mi (1,328.24 km) |
| Montalegre to Oudenburg | 823.84 mi (1,325.84 km) |
| Montalegre to Oupeye | 885.53 mi (1,425.12 km) |
| Montalegre to Overijse | 851.85 mi (1,370.92 km) |
| Montalegre to Overpelt | 900.47 mi (1,449.16 km) |
| Montalegre to Paal | 884.44 mi (1,423.37 km) |
| Montalegre to Peer | 897.89 mi (1,445.01 km) |
| Montalegre to Pepinster | 885.45 mi (1,425.00 km) |
| Montalegre to Peruwelz | 808.77 mi (1,301.60 km) |
| Montalegre to Perwez | 853.88 mi (1,374.19 km) |
| Montalegre to Philippeville | 826.07 mi (1,329.43 km) |
