| Southborough to Montalegre | 749.34 mi (1,205.94 km) |
| Southborough to Montemor-o-Novo | 957.34 mi (1,540.68 km) |
| Southborough to Montemor-o-Velho | 872.38 mi (1,403.97 km) |
| Southborough to Montijo | 969.94 mi (1,560.97 km) |
| Southborough to Mortagua | 845.38 mi (1,360.51 km) |
| Southborough to Moura | 975.38 mi (1,569.72 km) |
| Southborough to Murtosa | 836.32 mi (1,345.92 km) |
| Southborough to Nazare | 916.49 mi (1,474.96 km) |
| Southborough to Nelas | 831.50 mi (1,338.17 km) |
| Southborough to Obidos | 933.64 mi (1,502.54 km) |
| Southborough to Odemira | 1,034.11 mi (1,664.24 km) |
| Southborough to Odivelas | 969.53 mi (1,560.30 km) |
| Southborough to Oeiras | 979.36 mi (1,576.13 km) |
| Southborough to Olhao | 1,054.60 mi (1,697.22 km) |
| Southborough to Oliveira de Azemeis | 825.96 mi (1,329.25 km) |
