| Sile to Mangualde | 1,937.33 mi (3,117.83 km) |
| Sile to Marco de Canavezes | 1,948.02 mi (3,135.03 km) |
| Sile to Marinha Grande | 2,012.05 mi (3,238.08 km) |
| Sile to Massama | 2,048.90 mi (3,297.39 km) |
| Sile to Matosinhos | 1,975.91 mi (3,179.92 km) |
| Sile to Mealhada | 1,976.14 mi (3,180.28 km) |
| Sile to Melgaco | 1,940.67 mi (3,123.21 km) |
| Sile to Melres | 1,962.49 mi (3,158.32 km) |
| Sile to Mira | 1,989.74 mi (3,202.17 km) |
| Sile to Miranda do Corvo | 1,975.06 mi (3,178.55 km) |
| Sile to Mirandela | 1,894.50 mi (3,048.91 km) |
| Sile to Mogadouro | 1,873.07 mi (3,014.41 km) |
| Sile to Moimenta da Beira | 1,923.88 mi (3,096.19 km) |
| Sile to Moita | 2,036.09 mi (3,276.77 km) |
| Sile to Moncao | 1,951.98 mi (3,141.41 km) |
