| Sid to Mangualde | 1,395.26 mi (2,245.46 km) |
| Sid to Marco de Canavezes | 1,399.78 mi (2,252.72 km) |
| Sid to Marinha Grande | 1,475.21 mi (2,374.12 km) |
| Sid to Massama | 1,520.69 mi (2,447.32 km) |
| Sid to Matosinhos | 1,426.58 mi (2,295.87 km) |
| Sid to Mealhada | 1,434.54 mi (2,308.67 km) |
| Sid to Melgaco | 1,384.26 mi (2,227.75 km) |
| Sid to Melres | 1,414.79 mi (2,276.88 km) |
| Sid to Mira | 1,447.02 mi (2,328.76 km) |
| Sid to Miranda do Corvo | 1,436.42 mi (2,311.70 km) |
| Sid to Mirandela | 1,345.43 mi (2,165.26 km) |
| Sid to Mogadouro | 1,326.34 mi (2,134.54 km) |
| Sid to Moimenta da Beira | 1,378.60 mi (2,218.65 km) |
| Sid to Moita | 1,509.84 mi (2,429.85 km) |
| Sid to Moncao | 1,395.59 mi (2,245.98 km) |
