| Montemor-o-Novo to Orbetello | 1,050.58 mi (1,690.75 km) |
| Montemor-o-Novo to Oria | 1,377.65 mi (2,217.11 km) |
| Montemor-o-Novo to Oristano | 901.81 mi (1,451.32 km) |
| Montemor-o-Novo to Orta Nova | 1,275.97 mi (2,053.48 km) |
| Montemor-o-Novo to Orte | 1,110.11 mi (1,786.55 km) |
| Montemor-o-Novo to Ortona | 1,211.59 mi (1,949.87 km) |
| Montemor-o-Novo to Orvieto | 1,098.48 mi (1,767.84 km) |
| Montemor-o-Novo to Orzinuovi | 1,038.56 mi (1,671.41 km) |
| Montemor-o-Novo to Osimo | 1,174.83 mi (1,890.71 km) |
| Montemor-o-Novo to Ospitaletto | 1,048.67 mi (1,687.66 km) |
| Montemor-o-Novo to Ostuni | 1,374.25 mi (2,211.64 km) |
| Montemor-o-Novo to Ottaviano | 1,211.65 mi (1,949.96 km) |
| Montemor-o-Novo to Ovada | 961.54 mi (1,547.46 km) |
| Montemor-o-Novo to Ozieri | 924.69 mi (1,488.14 km) |
| Montemor-o-Novo to Paceco | 1,124.31 mi (1,809.40 km) |
