| Orbetello to Montemor-o-Novo | 1,050.58 mi (1,690.75 km) |
| Orbetello to Montemor-o-Velho | 1,042.09 mi (1,677.08 km) |
| Orbetello to Montijo | 1,084.32 mi (1,745.05 km) |
| Orbetello to Mortagua | 1,014.48 mi (1,632.64 km) |
| Orbetello to Moura | 1,025.19 mi (1,649.88 km) |
| Orbetello to Murtosa | 1,029.97 mi (1,657.58 km) |
| Orbetello to Nazare | 1,072.50 mi (1,726.02 km) |
| Orbetello to Nelas | 993.54 mi (1,598.94 km) |
| Orbetello to Obidos | 1,082.16 mi (1,741.57 km) |
| Orbetello to Odemira | 1,099.51 mi (1,769.50 km) |
| Orbetello to Odivelas | 1,095.96 mi (1,763.77 km) |
| Orbetello to Oeiras | 1,105.42 mi (1,779.00 km) |
| Orbetello to Olhao | 1,076.41 mi (1,732.31 km) |
| Orbetello to Oliveira de Azemeis | 1,020.25 mi (1,641.94 km) |
| Orbetello to Oliveira de Frades | 1,007.29 mi (1,621.08 km) |
