| Preddvor to Mangualde | 1,175.48 mi (1,891.76 km) |
| Preddvor to Marco de Canavezes | 1,176.19 mi (1,892.89 km) |
| Preddvor to Marinha Grande | 1,257.78 mi (2,024.20 km) |
| Preddvor to Massama | 1,307.89 mi (2,104.84 km) |
| Preddvor to Matosinhos | 1,202.11 mi (1,934.61 km) |
| Preddvor to Mealhada | 1,214.66 mi (1,954.81 km) |
| Preddvor to Melgaco | 1,155.82 mi (1,860.11 km) |
| Preddvor to Melres | 1,191.39 mi (1,917.36 km) |
| Preddvor to Mira | 1,226.35 mi (1,973.62 km) |
| Preddvor to Miranda do Corvo | 1,218.30 mi (1,960.67 km) |
| Preddvor to Mirandela | 1,121.83 mi (1,805.42 km) |
| Preddvor to Mogadouro | 1,104.39 mi (1,777.35 km) |
| Preddvor to Moimenta da Beira | 1,157.03 mi (1,862.05 km) |
| Preddvor to Moita | 1,298.31 mi (2,089.42 km) |
| Preddvor to Moncao | 1,167.08 mi (1,878.23 km) |
