| Portchester to Mangualde | 775.75 mi (1,248.45 km) |
| Portchester to Marco de Canavezes | 746.95 mi (1,202.11 km) |
| Portchester to Marinha Grande | 854.17 mi (1,374.65 km) |
| Portchester to Massama | 924.44 mi (1,487.75 km) |
| Portchester to Matosinhos | 759.10 mi (1,221.65 km) |
| Portchester to Mealhada | 803.84 mi (1,293.66 km) |
| Portchester to Melgaco | 691.39 mi (1,112.68 km) |
| Portchester to Melres | 759.69 mi (1,222.61 km) |
| Portchester to Mira | 806.74 mi (1,298.33 km) |
| Portchester to Miranda do Corvo | 819.43 mi (1,318.74 km) |
| Portchester to Mirandela | 707.99 mi (1,139.40 km) |
| Portchester to Mogadouro | 709.11 mi (1,141.20 km) |
| Portchester to Moimenta da Beira | 748.81 mi (1,205.09 km) |
| Portchester to Moita | 925.29 mi (1,489.12 km) |
| Portchester to Moncao | 699.04 mi (1,125.00 km) |
