| Biddeford to Mangualde | 3,145.78 mi (5,062.64 km) |
| Biddeford to Marco de Canavezes | 3,110.45 mi (5,005.78 km) |
| Biddeford to Marinha Grande | 3,115.40 mi (5,013.75 km) |
| Biddeford to Massama | 3,129.23 mi (5,036.00 km) |
| Biddeford to Matosinhos | 3,084.44 mi (4,963.93 km) |
| Biddeford to Mealhada | 3,119.60 mi (5,020.51 km) |
| Biddeford to Melgaco | 3,078.46 mi (4,954.30 km) |
| Biddeford to Melres | 3,102.00 mi (4,992.18 km) |
| Biddeford to Mira | 3,104.64 mi (4,996.44 km) |
| Biddeford to Miranda do Corvo | 3,133.57 mi (5,043.00 km) |
| Biddeford to Mirandela | 3,147.34 mi (5,065.16 km) |
| Biddeford to Mogadouro | 3,173.62 mi (5,107.45 km) |
| Biddeford to Moimenta da Beira | 3,141.71 mi (5,056.09 km) |
| Biddeford to Moita | 3,146.58 mi (5,063.94 km) |
| Biddeford to Moncao | 3,069.66 mi (4,940.14 km) |
