| Middelharnis to Marco de Canavezes | 933.74 mi (1,502.71 km) |
| Middelharnis to Marinha Grande | 1,039.02 mi (1,672.14 km) |
| Middelharnis to Massama | 1,106.87 mi (1,781.33 km) |
| Middelharnis to Matosinhos | 950.12 mi (1,529.07 km) |
| Middelharnis to Mealhada | 988.40 mi (1,590.68 km) |
| Middelharnis to Melgaco | 884.87 mi (1,424.06 km) |
| Middelharnis to Melres | 947.75 mi (1,525.26 km) |
| Middelharnis to Mira | 993.75 mi (1,599.28 km) |
| Middelharnis to Miranda do Corvo | 1,001.53 mi (1,611.80 km) |
| Middelharnis to Mirandela | 888.44 mi (1,429.81 km) |
| Middelharnis to Mogadouro | 884.34 mi (1,423.21 km) |
| Middelharnis to Moimenta da Beira | 929.96 mi (1,496.63 km) |
| Middelharnis to Moita | 1,105.07 mi (1,778.44 km) |
| Middelharnis to Moncao | 893.86 mi (1,438.53 km) |
| Middelharnis to Montalegre | 886.87 mi (1,427.27 km) |
