| Valley to Mangualde | 4,183.76 mi (6,733.11 km) |
| Valley to Marco de Canavezes | 4,151.34 mi (6,680.93 km) |
| Valley to Marinha Grande | 4,145.19 mi (6,671.04 km) |
| Valley to Massama | 4,151.08 mi (6,680.52 km) |
| Valley to Matosinhos | 4,124.29 mi (6,637.40 km) |
| Valley to Mealhada | 4,154.73 mi (6,686.40 km) |
| Valley to Melgaco | 4,124.84 mi (6,638.29 km) |
| Valley to Melres | 4,141.67 mi (6,665.38 km) |
| Valley to Mira | 4,139.52 mi (6,661.92 km) |
| Valley to Miranda do Corvo | 4,167.06 mi (6,706.24 km) |
| Valley to Mirandela | 4,191.87 mi (6,746.17 km) |
| Valley to Mogadouro | 4,218.10 mi (6,788.37 km) |
| Valley to Moimenta da Beira | 4,182.35 mi (6,730.85 km) |
| Valley to Moita | 4,168.38 mi (6,708.35 km) |
| Valley to Moncao | 4,115.42 mi (6,623.12 km) |
