| Piran to Mangualde | 1,125.19 mi (1,810.82 km) |
| Piran to Marco de Canavezes | 1,127.72 mi (1,814.88 km) |
| Piran to Marinha Grande | 1,206.54 mi (1,941.75 km) |
| Piran to Massama | 1,254.88 mi (2,019.53 km) |
| Piran to Matosinhos | 1,154.12 mi (1,857.37 km) |
| Piran to Mealhada | 1,164.45 mi (1,874.01 km) |
| Piran to Melgaco | 1,110.01 mi (1,786.38 km) |
| Piran to Melres | 1,142.83 mi (1,839.22 km) |
| Piran to Mira | 1,176.51 mi (1,893.42 km) |
| Piran to Miranda do Corvo | 1,167.33 mi (1,878.63 km) |
| Piran to Mirandela | 1,073.32 mi (1,727.34 km) |
| Piran to Mogadouro | 1,055.05 mi (1,697.93 km) |
| Piran to Moimenta da Beira | 1,107.55 mi (1,782.43 km) |
| Piran to Moita | 1,244.82 mi (2,003.35 km) |
| Piran to Moncao | 1,121.31 mi (1,804.58 km) |
