| Aci Catena to Marco de Canavezes | 1,263.66 mi (2,033.67 km) |
| Aci Catena to Marinha Grande | 1,302.70 mi (2,096.49 km) |
| Aci Catena to Massama | 1,324.17 mi (2,131.05 km) |
| Aci Catena to Matosinhos | 1,292.21 mi (2,079.61 km) |
| Aci Catena to Mealhada | 1,277.09 mi (2,055.27 km) |
| Aci Catena to Melgaco | 1,275.29 mi (2,052.39 km) |
| Aci Catena to Melres | 1,276.17 mi (2,053.80 km) |
| Aci Catena to Mira | 1,292.05 mi (2,079.35 km) |
| Aci Catena to Miranda do Corvo | 1,270.71 mi (2,045.01 km) |
| Aci Catena to Mirandela | 1,215.23 mi (1,955.72 km) |
| Aci Catena to Mogadouro | 1,190.25 mi (1,915.53 km) |
| Aci Catena to Moimenta da Beira | 1,234.90 mi (1,987.39 km) |
| Aci Catena to Moita | 1,309.05 mi (2,106.71 km) |
| Aci Catena to Moncao | 1,285.84 mi (2,069.36 km) |
| Aci Catena to Montalegre | 1,248.87 mi (2,009.86 km) |
