| Castel San Giorgio to Marco de Canavezes | 1,188.71 mi (1,913.05 km) |
| Castel San Giorgio to Marinha Grande | 1,244.25 mi (2,002.43 km) |
| Castel San Giorgio to Massama | 1,276.87 mi (2,054.93 km) |
| Castel San Giorgio to Matosinhos | 1,217.14 mi (1,958.79 km) |
| Castel San Giorgio to Mealhada | 1,211.55 mi (1,949.79 km) |
| Castel San Giorgio to Melgaco | 1,189.36 mi (1,914.09 km) |
| Castel San Giorgio to Melres | 1,202.55 mi (1,935.32 km) |
| Castel San Giorgio to Mira | 1,225.74 mi (1,972.64 km) |
| Castel San Giorgio to Miranda do Corvo | 1,208.64 mi (1,945.11 km) |
| Castel San Giorgio to Mirandela | 1,136.70 mi (1,829.34 km) |
| Castel San Giorgio to Mogadouro | 1,113.61 mi (1,792.17 km) |
| Castel San Giorgio to Moimenta da Beira | 1,162.54 mi (1,870.92 km) |
| Castel San Giorgio to Moita | 1,263.42 mi (2,033.28 km) |
| Castel San Giorgio to Moncao | 1,200.45 mi (1,931.95 km) |
| Castel San Giorgio to Montalegre | 1,166.30 mi (1,876.97 km) |
