| Tilehurst to Mangualde | 815.43 mi (1,312.31 km) |
| Tilehurst to Marco de Canavezes | 785.91 mi (1,264.79 km) |
| Tilehurst to Marinha Grande | 893.15 mi (1,437.39 km) |
| Tilehurst to Massama | 963.61 mi (1,550.78 km) |
| Tilehurst to Matosinhos | 797.44 mi (1,283.35 km) |
| Tilehurst to Mealhada | 842.96 mi (1,356.61 km) |
| Tilehurst to Melgaco | 729.52 mi (1,174.05 km) |
| Tilehurst to Melres | 798.44 mi (1,284.97 km) |
| Tilehurst to Mira | 845.54 mi (1,360.76 km) |
| Tilehurst to Miranda do Corvo | 858.81 mi (1,382.13 km) |
| Tilehurst to Mirandela | 747.79 mi (1,203.46 km) |
| Tilehurst to Mogadouro | 749.44 mi (1,206.11 km) |
| Tilehurst to Moimenta da Beira | 788.44 mi (1,268.88 km) |
| Tilehurst to Moita | 964.77 mi (1,552.65 km) |
| Tilehurst to Moncao | 736.95 mi (1,186.01 km) |
