| Hwlffordd to Mangualde | 784.83 mi (1,263.06 km) |
| Hwlffordd to Marco de Canavezes | 748.79 mi (1,205.05 km) |
| Hwlffordd to Marinha Grande | 853.87 mi (1,374.17 km) |
| Hwlffordd to Massama | 924.76 mi (1,488.26 km) |
| Hwlffordd to Matosinhos | 754.43 mi (1,214.14 km) |
| Hwlffordd to Mealhada | 806.00 mi (1,297.14 km) |
| Hwlffordd to Melgaco | 686.69 mi (1,105.12 km) |
| Hwlffordd to Melres | 759.15 mi (1,221.73 km) |
| Hwlffordd to Mira | 805.50 mi (1,296.32 km) |
| Hwlffordd to Miranda do Corvo | 824.15 mi (1,326.33 km) |
| Hwlffordd to Mirandela | 720.27 mi (1,159.16 km) |
| Hwlffordd to Mogadouro | 727.87 mi (1,171.39 km) |
| Hwlffordd to Moimenta da Beira | 758.02 mi (1,219.91 km) |
| Hwlffordd to Moita | 928.96 mi (1,495.02 km) |
| Hwlffordd to Moncao | 691.94 mi (1,113.56 km) |
