| Mersch to Marco de Canavezes | 906.78 mi (1,459.33 km) |
| Mersch to Marinha Grande | 1,007.24 mi (1,621.00 km) |
| Mersch to Massama | 1,071.13 mi (1,723.82 km) |
| Mersch to Matosinhos | 926.97 mi (1,491.82 km) |
| Mersch to Mealhada | 957.66 mi (1,541.20 km) |
| Mersch to Melgaco | 866.33 mi (1,394.22 km) |
| Mersch to Melres | 921.65 mi (1,483.25 km) |
| Mersch to Mira | 965.29 mi (1,553.48 km) |
| Mersch to Miranda do Corvo | 968.03 mi (1,557.90 km) |
| Mersch to Mirandela | 856.84 mi (1,378.95 km) |
| Mersch to Mogadouro | 848.06 mi (1,364.82 km) |
| Mersch to Moimenta da Beira | 897.65 mi (1,444.62 km) |
| Mersch to Moita | 1,066.82 mi (1,716.89 km) |
| Mersch to Moncao | 876.44 mi (1,410.49 km) |
| Mersch to Montalegre | 862.46 mi (1,388.00 km) |
