| Rio Grande City to Mangualde | 5,108.94 mi (8,222.05 km) |
| Rio Grande City to Marco de Canavezes | 5,075.61 mi (8,168.41 km) |
| Rio Grande City to Marinha Grande | 5,072.35 mi (8,163.17 km) |
| Rio Grande City to Massama | 5,079.71 mi (8,175.00 km) |
| Rio Grande City to Matosinhos | 5,048.86 mi (8,125.36 km) |
| Rio Grande City to Mealhada | 5,080.65 mi (8,176.52 km) |
| Rio Grande City to Melgaco | 5,047.19 mi (8,122.67 km) |
| Rio Grande City to Melres | 5,066.31 mi (8,153.44 km) |
| Rio Grande City to Mira | 5,065.49 mi (8,152.13 km) |
| Rio Grande City to Miranda do Corvo | 5,093.41 mi (8,197.05 km) |
| Rio Grande City to Mirandela | 5,114.97 mi (8,231.75 km) |
| Rio Grande City to Mogadouro | 5,141.24 mi (8,274.03 km) |
| Rio Grande City to Moimenta da Beira | 5,106.74 mi (8,218.50 km) |
| Rio Grande City to Moita | 5,097.03 mi (8,202.87 km) |
| Rio Grande City to Moncao | 5,037.99 mi (8,107.87 km) |
