| Houghton le Spring to Mangualde | 1,025.22 mi (1,649.93 km) |
| Houghton le Spring to Marco de Canavezes | 991.81 mi (1,596.16 km) |
| Houghton le Spring to Marinha Grande | 1,098.30 mi (1,767.55 km) |
| Houghton le Spring to Massama | 1,169.31 mi (1,881.82 km) |
| Houghton le Spring to Matosinhos | 999.82 mi (1,609.06 km) |
| Houghton le Spring to Mealhada | 1,049.27 mi (1,688.63 km) |
| Houghton le Spring to Melgaco | 931.61 mi (1,499.28 km) |
| Houghton le Spring to Melres | 1,003.12 mi (1,614.36 km) |
| Houghton le Spring to Mira | 1,050.01 mi (1,689.82 km) |
| Houghton le Spring to Miranda do Corvo | 1,066.53 mi (1,716.42 km) |
| Houghton le Spring to Mirandela | 958.83 mi (1,543.09 km) |
| Houghton le Spring to Mogadouro | 963.54 mi (1,550.67 km) |
| Houghton le Spring to Moimenta da Beira | 998.17 mi (1,606.40 km) |
| Houghton le Spring to Moita | 1,172.29 mi (1,886.61 km) |
| Houghton le Spring to Moncao | 937.71 mi (1,509.10 km) |
