| Mering to Marco de Canavezes | 1,055.04 mi (1,697.93 km) |
| Mering to Marinha Grande | 1,146.33 mi (1,844.84 km) |
| Mering to Massama | 1,203.37 mi (1,936.64 km) |
| Mering to Matosinhos | 1,078.81 mi (1,736.17 km) |
| Mering to Mealhada | 1,099.66 mi (1,769.74 km) |
| Mering to Melgaco | 1,025.42 mi (1,650.26 km) |
| Mering to Melres | 1,070.33 mi (1,722.53 km) |
| Mering to Mira | 1,109.71 mi (1,785.90 km) |
| Mering to Miranda do Corvo | 1,106.39 mi (1,780.56 km) |
| Mering to Mirandela | 1,001.73 mi (1,612.13 km) |
| Mering to Mogadouro | 987.81 mi (1,589.73 km) |
| Mering to Moimenta da Beira | 1,040.04 mi (1,673.78 km) |
| Mering to Moita | 1,196.05 mi (1,924.86 km) |
| Mering to Moncao | 1,036.34 mi (1,667.83 km) |
| Mering to Montalegre | 1,015.32 mi (1,634.00 km) |
