| Reading to Mangualde | 816.47 mi (1,313.98 km) |
| Reading to Marco de Canavezes | 787.06 mi (1,266.65 km) |
| Reading to Marinha Grande | 894.31 mi (1,439.25 km) |
| Reading to Massama | 964.73 mi (1,552.59 km) |
| Reading to Matosinhos | 798.68 mi (1,285.35 km) |
| Reading to Mealhada | 844.09 mi (1,358.43 km) |
| Reading to Melgaco | 730.79 mi (1,176.09 km) |
| Reading to Melres | 799.63 mi (1,286.88 km) |
| Reading to Mira | 846.72 mi (1,362.66 km) |
| Reading to Miranda do Corvo | 859.90 mi (1,383.88 km) |
| Reading to Mirandela | 748.81 mi (1,205.09 km) |
| Reading to Mogadouro | 750.36 mi (1,207.59 km) |
| Reading to Moimenta da Beira | 789.49 mi (1,270.56 km) |
| Reading to Moita | 965.85 mi (1,554.38 km) |
| Reading to Moncao | 738.25 mi (1,188.09 km) |
