| Montemor-o-Velho to Orbetello | 1,042.09 mi (1,677.08 km) |
| Montemor-o-Velho to Oria | 1,381.10 mi (2,222.67 km) |
| Montemor-o-Velho to Oristano | 912.59 mi (1,468.67 km) |
| Montemor-o-Velho to Orta Nova | 1,275.23 mi (2,052.28 km) |
| Montemor-o-Velho to Orte | 1,101.94 mi (1,773.40 km) |
| Montemor-o-Velho to Ortona | 1,204.64 mi (1,938.69 km) |
| Montemor-o-Velho to Orvieto | 1,088.45 mi (1,751.69 km) |
| Montemor-o-Velho to Orzinuovi | 1,008.02 mi (1,622.25 km) |
| Montemor-o-Velho to Osimo | 1,160.42 mi (1,867.51 km) |
| Montemor-o-Velho to Ospitaletto | 1,017.29 mi (1,637.17 km) |
| Montemor-o-Velho to Ostuni | 1,376.44 mi (2,215.17 km) |
| Montemor-o-Velho to Ottaviano | 1,214.06 mi (1,953.85 km) |
| Montemor-o-Velho to Ovada | 934.41 mi (1,503.79 km) |
| Montemor-o-Velho to Ozieri | 929.84 mi (1,496.43 km) |
| Montemor-o-Velho to Paceco | 1,146.08 mi (1,844.44 km) |
