| Slough to Montalegre | 750.45 mi (1,207.74 km) |
| Slough to Montemor-o-Novo | 961.97 mi (1,548.14 km) |
| Slough to Montemor-o-Velho | 873.91 mi (1,406.43 km) |
| Slough to Montijo | 972.97 mi (1,565.84 km) |
| Slough to Mortagua | 847.62 mi (1,364.12 km) |
| Slough to Moura | 982.34 mi (1,580.93 km) |
| Slough to Murtosa | 837.09 mi (1,347.17 km) |
| Slough to Nazare | 917.93 mi (1,477.27 km) |
| Slough to Nelas | 834.59 mi (1,343.14 km) |
| Slough to Obidos | 935.20 mi (1,505.06 km) |
| Slough to Odemira | 1,038.98 mi (1,672.08 km) |
| Slough to Odivelas | 971.79 mi (1,563.94 km) |
| Slough to Oeiras | 981.45 mi (1,579.49 km) |
| Slough to Olhao | 1,061.75 mi (1,708.72 km) |
| Slough to Oliveira de Azemeis | 826.96 mi (1,330.86 km) |
