| Holt to Mangualde | 3,823.66 mi (6,153.59 km) |
| Holt to Marco de Canavezes | 3,786.40 mi (6,093.62 km) |
| Holt to Marinha Grande | 3,798.87 mi (6,113.70 km) |
| Holt to Massama | 3,817.10 mi (6,143.03 km) |
| Holt to Matosinhos | 3,761.35 mi (6,053.31 km) |
| Holt to Mealhada | 3,799.62 mi (6,114.90 km) |
| Holt to Melgaco | 3,750.19 mi (6,035.34 km) |
| Holt to Melres | 3,778.91 mi (6,081.57 km) |
| Holt to Mira | 3,784.93 mi (6,091.26 km) |
| Holt to Miranda do Corvo | 3,814.60 mi (6,139.01 km) |
| Holt to Mirandela | 3,820.17 mi (6,147.96 km) |
| Holt to Mogadouro | 3,846.32 mi (6,190.05 km) |
| Holt to Moimenta da Beira | 3,817.65 mi (6,143.91 km) |
| Holt to Moita | 3,834.40 mi (6,170.87 km) |
| Holt to Moncao | 3,741.98 mi (6,022.14 km) |
