| Middlesex to Mangualde | 3,411.75 mi (5,490.67 km) |
| Middlesex to Marco de Canavezes | 3,377.49 mi (5,435.54 km) |
| Middlesex to Marinha Grande | 3,378.23 mi (5,436.73 km) |
| Middlesex to Massama | 3,389.12 mi (5,454.25 km) |
| Middlesex to Matosinhos | 3,351.05 mi (5,393.00 km) |
| Middlesex to Mealhada | 3,384.45 mi (5,446.74 km) |
| Middlesex to Melgaco | 3,347.59 mi (5,387.43 km) |
| Middlesex to Melres | 3,368.56 mi (5,421.17 km) |
| Middlesex to Mira | 3,369.38 mi (5,422.49 km) |
| Middlesex to Miranda do Corvo | 3,397.82 mi (5,468.26 km) |
| Middlesex to Mirandela | 3,415.83 mi (5,497.24 km) |
| Middlesex to Mogadouro | 3,442.11 mi (5,539.54 km) |
| Middlesex to Moimenta da Beira | 3,408.69 mi (5,485.75 km) |
| Middlesex to Moita | 3,406.48 mi (5,482.19 km) |
| Middlesex to Moncao | 3,338.54 mi (5,372.87 km) |
