| Portishead to Mangualde | 788.54 mi (1,269.04 km) |
| Portishead to Marco de Canavezes | 756.17 mi (1,216.94 km) |
| Portishead to Marinha Grande | 863.08 mi (1,388.99 km) |
| Portishead to Massama | 934.00 mi (1,503.13 km) |
| Portishead to Matosinhos | 765.37 mi (1,231.75 km) |
| Portishead to Mealhada | 813.60 mi (1,309.36 km) |
| Portishead to Melgaco | 697.11 mi (1,121.90 km) |
| Portishead to Melres | 767.89 mi (1,235.80 km) |
| Portishead to Mira | 814.93 mi (1,311.50 km) |
| Portishead to Miranda do Corvo | 830.47 mi (1,336.51 km) |
| Portishead to Mirandela | 721.78 mi (1,161.59 km) |
| Portishead to Mogadouro | 725.92 mi (1,168.26 km) |
| Portishead to Moimenta da Beira | 761.48 mi (1,225.48 km) |
| Portishead to Moita | 936.41 mi (1,507.01 km) |
| Portishead to Moncao | 703.71 mi (1,132.51 km) |
