| Slupca to Marco de Canavezes | 1,439.67 mi (2,316.92 km) |
| Slupca to Marinha Grande | 1,536.66 mi (2,473.02 km) |
| Slupca to Massama | 1,597.47 mi (2,570.88 km) |
| Slupca to Matosinhos | 1,461.29 mi (2,351.72 km) |
| Slupca to Mealhada | 1,488.17 mi (2,394.99 km) |
| Slupca to Melgaco | 1,402.76 mi (2,257.53 km) |
| Slupca to Melres | 1,454.77 mi (2,341.23 km) |
| Slupca to Mira | 1,496.88 mi (2,409.00 km) |
| Slupca to Miranda do Corvo | 1,496.93 mi (2,409.07 km) |
| Slupca to Mirandela | 1,388.09 mi (2,233.91 km) |
| Slupca to Mogadouro | 1,376.96 mi (2,216.00 km) |
| Slupca to Moimenta da Beira | 1,428.03 mi (2,298.20 km) |
| Slupca to Moita | 1,591.55 mi (2,561.35 km) |
| Slupca to Moncao | 1,413.14 mi (2,274.23 km) |
| Slupca to Montalegre | 1,396.85 mi (2,248.02 km) |
