| Siniscola to Marco de Canavezes | 931.63 mi (1,499.31 km) |
| Siniscola to Marinha Grande | 983.50 mi (1,582.80 km) |
| Siniscola to Massama | 1,014.79 mi (1,633.15 km) |
| Siniscola to Matosinhos | 960.17 mi (1,545.25 km) |
| Siniscola to Mealhada | 952.09 mi (1,532.24 km) |
| Siniscola to Melgaco | 936.08 mi (1,506.47 km) |
| Siniscola to Melres | 945.12 mi (1,521.02 km) |
| Siniscola to Mira | 966.50 mi (1,555.42 km) |
| Siniscola to Miranda do Corvo | 948.46 mi (1,526.40 km) |
| Siniscola to Mirandela | 880.56 mi (1,417.12 km) |
| Siniscola to Mogadouro | 856.78 mi (1,378.86 km) |
| Siniscola to Moimenta da Beira | 904.63 mi (1,455.86 km) |
| Siniscola to Moita | 1,001.20 mi (1,611.28 km) |
| Siniscola to Moncao | 947.00 mi (1,524.04 km) |
| Siniscola to Montalegre | 911.66 mi (1,467.17 km) |
