| Seaside to Mangualde | 5,663.01 mi (9,113.74 km) |
| Seaside to Marco de Canavezes | 5,621.11 mi (9,046.31 km) |
| Seaside to Marinha Grande | 5,656.47 mi (9,103.20 km) |
| Seaside to Massama | 5,688.40 mi (9,154.60 km) |
| Seaside to Matosinhos | 5,599.80 mi (9,012.00 km) |
| Seaside to Mealhada | 5,646.37 mi (9,086.95 km) |
| Seaside to Melgaco | 5,573.58 mi (8,969.80 km) |
| Seaside to Melres | 5,616.81 mi (9,039.38 km) |
| Seaside to Mira | 5,632.96 mi (9,065.37 km) |
| Seaside to Miranda do Corvo | 5,664.03 mi (9,115.37 km) |
| Seaside to Mirandela | 5,644.28 mi (9,083.60 km) |
| Seaside to Mogadouro | 5,669.12 mi (9,123.57 km) |
| Seaside to Moimenta da Beira | 5,651.27 mi (9,094.84 km) |
| Seaside to Moita | 5,705.05 mi (9,181.39 km) |
| Seaside to Moncao | 5,567.41 mi (8,959.88 km) |
