| Grenchen to Mangualde | 878.99 mi (1,414.60 km) |
| Grenchen to Marco de Canavezes | 872.75 mi (1,404.56 km) |
| Grenchen to Marinha Grande | 963.91 mi (1,551.27 km) |
| Grenchen to Massama | 1,021.22 mi (1,643.49 km) |
| Grenchen to Matosinhos | 896.66 mi (1,443.03 km) |
| Grenchen to Mealhada | 917.22 mi (1,476.13 km) |
| Grenchen to Melgaco | 843.94 mi (1,358.18 km) |
| Grenchen to Melres | 888.05 mi (1,429.17 km) |
| Grenchen to Mira | 927.28 mi (1,492.32 km) |
| Grenchen to Miranda do Corvo | 923.97 mi (1,486.98 km) |
| Grenchen to Mirandela | 819.37 mi (1,318.64 km) |
| Grenchen to Mogadouro | 805.37 mi (1,296.12 km) |
| Grenchen to Moimenta da Beira | 857.61 mi (1,380.18 km) |
| Grenchen to Moita | 1,014.06 mi (1,631.97 km) |
| Grenchen to Moncao | 854.91 mi (1,375.85 km) |
