| Thorne to Mangualde | 952.68 mi (1,533.20 km) |
| Thorne to Marco de Canavezes | 920.89 mi (1,482.03 km) |
| Thorne to Marinha Grande | 1,027.90 mi (1,654.24 km) |
| Thorne to Massama | 1,098.77 mi (1,768.31 km) |
| Thorne to Matosinhos | 930.40 mi (1,497.34 km) |
| Thorne to Mealhada | 978.28 mi (1,574.39 km) |
| Thorne to Melgaco | 862.16 mi (1,387.51 km) |
| Thorne to Melres | 932.74 mi (1,501.10 km) |
| Thorne to Mira | 979.81 mi (1,576.85 km) |
| Thorne to Miranda do Corvo | 994.97 mi (1,601.24 km) |
| Thorne to Mirandela | 885.64 mi (1,425.30 km) |
| Thorne to Mogadouro | 889.01 mi (1,430.72 km) |
| Thorne to Moimenta da Beira | 925.62 mi (1,489.64 km) |
| Thorne to Moita | 1,100.96 mi (1,771.83 km) |
| Thorne to Moncao | 868.82 mi (1,398.24 km) |
