| Southport to Mangualde | 927.99 mi (1,493.46 km) |
| Southport to Marco de Canavezes | 893.56 mi (1,438.04 km) |
| Southport to Marinha Grande | 999.60 mi (1,608.70 km) |
| Southport to Massama | 1,070.61 mi (1,722.98 km) |
| Southport to Matosinhos | 900.69 mi (1,449.51 km) |
| Southport to Mealhada | 950.98 mi (1,530.45 km) |
| Southport to Melgaco | 832.59 mi (1,339.93 km) |
| Southport to Melres | 904.52 mi (1,455.69 km) |
| Southport to Mira | 951.24 mi (1,530.87 km) |
| Southport to Miranda do Corvo | 968.59 mi (1,558.80 km) |
| Southport to Mirandela | 862.20 mi (1,387.58 km) |
| Southport to Mogadouro | 867.99 mi (1,396.89 km) |
| Southport to Moimenta da Beira | 901.00 mi (1,450.02 km) |
| Southport to Moita | 1,074.06 mi (1,728.54 km) |
| Southport to Moncao | 838.38 mi (1,349.24 km) |
