| Grass Valley to Mangualde | 5,505.96 mi (8,860.99 km) |
| Grass Valley to Marco de Canavezes | 5,463.68 mi (8,792.94 km) |
| Grass Valley to Marinha Grande | 5,501.57 mi (8,853.92 km) |
| Grass Valley to Massama | 5,535.14 mi (8,907.95 km) |
| Grass Valley to Matosinhos | 5,442.84 mi (8,759.41 km) |
| Grass Valley to Mealhada | 5,490.21 mi (8,835.65 km) |
| Grass Valley to Melgaco | 5,415.08 mi (8,714.73 km) |
| Grass Valley to Melres | 5,459.74 mi (8,786.60 km) |
| Grass Valley to Mira | 5,476.99 mi (8,814.36 km) |
| Grass Valley to Miranda do Corvo | 5,508.13 mi (8,864.48 km) |
| Grass Valley to Mirandela | 5,485.64 mi (8,828.28 km) |
| Grass Valley to Mogadouro | 5,510.26 mi (8,867.91 km) |
| Grass Valley to Moimenta da Beira | 5,493.62 mi (8,841.13 km) |
| Grass Valley to Moita | 5,551.65 mi (8,934.52 km) |
| Grass Valley to Moncao | 5,409.15 mi (8,705.18 km) |
