| Grand Forks to Mangualde | 4,195.53 mi (6,752.06 km) |
| Grand Forks to Marco de Canavezes | 4,154.38 mi (6,685.82 km) |
| Grand Forks to Marinha Grande | 4,185.73 mi (6,736.28 km) |
| Grand Forks to Massama | 4,215.72 mi (6,784.54 km) |
| Grand Forks to Matosinhos | 4,132.24 mi (6,650.21 km) |
| Grand Forks to Mealhada | 4,177.45 mi (6,722.95 km) |
| Grand Forks to Melgaco | 4,108.97 mi (6,612.75 km) |
| Grand Forks to Melres | 4,149.43 mi (6,677.86 km) |
| Grand Forks to Mira | 4,163.76 mi (6,700.92 km) |
| Grand Forks to Miranda do Corvo | 4,194.69 mi (6,750.70 km) |
| Grand Forks to Mirandela | 4,179.85 mi (6,726.82 km) |
| Grand Forks to Mogadouro | 4,205.09 mi (6,767.43 km) |
| Grand Forks to Moimenta da Beira | 4,184.88 mi (6,734.91 km) |
| Grand Forks to Moita | 4,232.49 mi (6,811.54 km) |
| Grand Forks to Moncao | 4,102.34 mi (6,602.09 km) |
