| Boom to Marco de Canavezes | 906.92 mi (1,459.55 km) |
| Boom to Marinha Grande | 1,011.31 mi (1,627.55 km) |
| Boom to Massama | 1,078.36 mi (1,735.46 km) |
| Boom to Matosinhos | 924.28 mi (1,487.48 km) |
| Boom to Mealhada | 960.82 mi (1,546.30 km) |
| Boom to Melgaco | 859.97 mi (1,383.99 km) |
| Boom to Melres | 921.18 mi (1,482.50 km) |
| Boom to Mira | 966.73 mi (1,555.80 km) |
| Boom to Miranda do Corvo | 973.33 mi (1,566.42 km) |
| Boom to Mirandela | 860.38 mi (1,384.65 km) |
| Boom to Mogadouro | 855.17 mi (1,376.27 km) |
| Boom to Moimenta da Beira | 901.86 mi (1,451.40 km) |
| Boom to Moita | 1,075.98 mi (1,731.62 km) |
| Boom to Moncao | 869.27 mi (1,398.95 km) |
| Boom to Montalegre | 860.53 mi (1,384.89 km) |
