| Mastic to Mangualde | 3,325.61 mi (5,352.05 km) |
| Mastic to Marco de Canavezes | 3,291.54 mi (5,297.22 km) |
| Mastic to Marinha Grande | 3,291.63 mi (5,297.36 km) |
| Mastic to Massama | 3,302.15 mi (5,314.30 km) |
| Mastic to Matosinhos | 3,265.03 mi (5,254.56 km) |
| Mastic to Mealhada | 3,298.14 mi (5,307.84 km) |
| Mastic to Melgaco | 3,262.04 mi (5,249.75 km) |
| Mastic to Melres | 3,282.53 mi (5,282.72 km) |
| Mastic to Mira | 3,283.05 mi (5,283.57 km) |
| Mastic to Miranda do Corvo | 3,311.42 mi (5,329.21 km) |
| Mastic to Mirandela | 3,330.14 mi (5,359.34 km) |
| Mastic to Mogadouro | 3,356.42 mi (5,401.63 km) |
| Mastic to Moimenta da Beira | 3,322.72 mi (5,347.41 km) |
| Mastic to Moita | 3,319.51 mi (5,342.24 km) |
| Mastic to Moncao | 3,252.94 mi (5,235.11 km) |
