| Biga to Mangualde | 1,829.23 mi (2,943.86 km) |
| Biga to Marco de Canavezes | 1,842.08 mi (2,964.54 km) |
| Biga to Marinha Grande | 1,901.87 mi (3,060.77 km) |
| Biga to Massama | 1,935.96 mi (3,115.63 km) |
| Biga to Matosinhos | 1,870.26 mi (3,009.89 km) |
| Biga to Mealhada | 1,867.69 mi (3,005.76 km) |
| Biga to Melgaco | 1,838.07 mi (2,958.09 km) |
| Biga to Melres | 1,856.29 mi (2,987.41 km) |
| Biga to Mira | 1,881.61 mi (3,028.16 km) |
| Biga to Miranda do Corvo | 1,865.63 mi (3,002.45 km) |
| Biga to Mirandela | 1,789.14 mi (2,879.34 km) |
| Biga to Mogadouro | 1,766.94 mi (2,843.62 km) |
| Biga to Moimenta da Beira | 1,816.97 mi (2,924.13 km) |
| Biga to Moita | 1,922.65 mi (3,094.20 km) |
| Biga to Moncao | 1,849.32 mi (2,976.19 km) |
