| Ostrov to Marco de Canavezes | 1,190.05 mi (1,915.19 km) |
| Ostrov to Marinha Grande | 1,285.63 mi (2,069.03 km) |
| Ostrov to Massama | 1,345.60 mi (2,165.53 km) |
| Ostrov to Matosinhos | 1,212.32 mi (1,951.03 km) |
| Ostrov to Mealhada | 1,237.56 mi (1,991.66 km) |
| Ostrov to Melgaco | 1,155.23 mi (1,859.17 km) |
| Ostrov to Melres | 1,205.22 mi (1,939.62 km) |
| Ostrov to Mira | 1,246.63 mi (2,006.26 km) |
| Ostrov to Miranda do Corvo | 1,245.81 mi (2,004.93 km) |
| Ostrov to Mirandela | 1,137.91 mi (1,831.29 km) |
| Ostrov to Mogadouro | 1,126.05 mi (1,812.20 km) |
| Ostrov to Moimenta da Beira | 1,177.48 mi (1,894.97 km) |
| Ostrov to Moita | 1,339.37 mi (2,155.51 km) |
| Ostrov to Moncao | 1,165.81 mi (1,876.18 km) |
| Ostrov to Montalegre | 1,148.04 mi (1,847.60 km) |
