| Horw to Mangualde | 913.44 mi (1,470.05 km) |
| Horw to Marco de Canavezes | 908.61 mi (1,462.26 km) |
| Horw to Marinha Grande | 998.01 mi (1,606.14 km) |
| Horw to Massama | 1,054.03 mi (1,696.30 km) |
| Horw to Matosinhos | 932.98 mi (1,501.48 km) |
| Horw to Mealhada | 951.94 mi (1,532.00 km) |
| Horw to Melgaco | 881.53 mi (1,418.69 km) |
| Horw to Melres | 923.91 mi (1,486.89 km) |
| Horw to Mira | 962.35 mi (1,548.75 km) |
| Horw to Miranda do Corvo | 958.08 mi (1,541.88 km) |
| Horw to Mirandela | 854.92 mi (1,375.86 km) |
| Horw to Mogadouro | 840.18 mi (1,352.13 km) |
| Horw to Moimenta da Beira | 892.61 mi (1,436.52 km) |
| Horw to Moita | 1,046.40 mi (1,684.01 km) |
| Horw to Moncao | 892.58 mi (1,436.48 km) |
