| Arco to Marco de Canavezes | 1,004.75 mi (1,616.98 km) |
| Arco to Marinha Grande | 1,087.00 mi (1,749.35 km) |
| Arco to Massama | 1,137.94 mi (1,831.33 km) |
| Arco to Matosinhos | 1,030.62 mi (1,658.63 km) |
| Arco to Mealhada | 1,043.56 mi (1,679.44 km) |
| Arco to Melgaco | 984.36 mi (1,584.18 km) |
| Arco to Melres | 1,019.96 mi (1,641.47 km) |
| Arco to Mira | 1,055.15 mi (1,698.09 km) |
| Arco to Miranda do Corvo | 1,047.45 mi (1,685.70 km) |
| Arco to Mirandela | 950.41 mi (1,529.53 km) |
| Arco to Mogadouro | 933.11 mi (1,501.69 km) |
| Arco to Moimenta da Beira | 985.76 mi (1,586.42 km) |
| Arco to Moita | 1,128.65 mi (1,816.39 km) |
| Arco to Moncao | 995.63 mi (1,602.31 km) |
| Arco to Montalegre | 969.64 mi (1,560.49 km) |
