| Morriston to Mangualde | 785.53 mi (1,264.18 km) |
| Morriston to Marco de Canavezes | 751.12 mi (1,208.82 km) |
| Morriston to Marinha Grande | 857.25 mi (1,379.61 km) |
| Morriston to Massama | 928.26 mi (1,493.90 km) |
| Morriston to Matosinhos | 758.45 mi (1,220.60 km) |
| Morriston to Mealhada | 808.55 mi (1,301.24 km) |
| Morriston to Melgaco | 690.31 mi (1,110.95 km) |
| Morriston to Melres | 762.14 mi (1,226.55 km) |
| Morriston to Mira | 808.90 mi (1,301.80 km) |
| Morriston to Miranda do Corvo | 826.13 mi (1,329.53 km) |
| Morriston to Mirandela | 719.80 mi (1,158.41 km) |
| Morriston to Mogadouro | 725.81 mi (1,168.08 km) |
| Morriston to Moimenta da Beira | 758.54 mi (1,220.76 km) |
| Morriston to Moita | 931.64 mi (1,499.32 km) |
| Morriston to Moncao | 696.20 mi (1,120.43 km) |
