| San Marcos to Mangualde | 5,644.59 mi (9,084.09 km) |
| San Marcos to Marco de Canavezes | 5,604.33 mi (9,019.29 km) |
| San Marcos to Marinha Grande | 5,630.33 mi (9,061.15 km) |
| San Marcos to Massama | 5,656.39 mi (9,103.08 km) |
| San Marcos to Matosinhos | 5,581.36 mi (8,982.33 km) |
| San Marcos to Mealhada | 5,624.79 mi (9,052.22 km) |
| San Marcos to Melgaco | 5,560.99 mi (8,949.55 km) |
| San Marcos to Melres | 5,598.70 mi (9,010.24 km) |
| San Marcos to Mira | 5,610.76 mi (9,029.64 km) |
| San Marcos to Miranda do Corvo | 5,641.42 mi (9,078.99 km) |
| San Marcos to Mirandela | 5,631.88 mi (9,063.63 km) |
| San Marcos to Mogadouro | 5,657.39 mi (9,104.69 km) |
| San Marcos to Moimenta da Beira | 5,635.11 mi (9,068.83 km) |
| San Marcos to Moita | 5,673.41 mi (9,130.47 km) |
| San Marcos to Moncao | 5,553.98 mi (8,938.27 km) |
