| Signa to Marco de Canavezes | 994.82 mi (1,601.00 km) |
| Signa to Marinha Grande | 1,066.38 mi (1,716.18 km) |
| Signa to Massama | 1,110.24 mi (1,786.75 km) |
| Signa to Matosinhos | 1,022.20 mi (1,645.07 km) |
| Signa to Mealhada | 1,027.03 mi (1,652.84 km) |
| Signa to Melgaco | 983.89 mi (1,583.41 km) |
| Signa to Melres | 1,009.62 mi (1,624.82 km) |
| Signa to Mira | 1,039.92 mi (1,673.59 km) |
| Signa to Miranda do Corvo | 1,028.00 mi (1,654.41 km) |
| Signa to Mirandela | 940.74 mi (1,513.98 km) |
| Signa to Mogadouro | 920.53 mi (1,481.45 km) |
| Signa to Moimenta da Beira | 972.31 mi (1,564.78 km) |
| Signa to Moita | 1,099.11 mi (1,768.85 km) |
| Signa to Moncao | 995.22 mi (1,601.65 km) |
| Signa to Montalegre | 965.05 mi (1,553.10 km) |
