| Merchweiler to Marco de Canavezes | 927.78 mi (1,493.11 km) |
| Merchweiler to Marinha Grande | 1,026.28 mi (1,651.64 km) |
| Merchweiler to Massama | 1,088.69 mi (1,752.08 km) |
| Merchweiler to Matosinhos | 948.96 mi (1,527.20 km) |
| Merchweiler to Mealhada | 977.26 mi (1,572.74 km) |
| Merchweiler to Melgaco | 889.97 mi (1,432.26 km) |
| Merchweiler to Melres | 942.81 mi (1,517.30 km) |
| Merchweiler to Mira | 985.52 mi (1,586.04 km) |
| Merchweiler to Miranda do Corvo | 986.76 mi (1,588.03 km) |
| Merchweiler to Mirandela | 876.77 mi (1,411.02 km) |
| Merchweiler to Mogadouro | 866.64 mi (1,394.73 km) |
| Merchweiler to Moimenta da Beira | 917.11 mi (1,475.95 km) |
| Merchweiler to Moita | 1,083.63 mi (1,743.94 km) |
| Merchweiler to Moncao | 900.32 mi (1,448.93 km) |
| Merchweiler to Montalegre | 884.46 mi (1,423.41 km) |
