| Heath to Mangualde | 3,806.96 mi (6,126.71 km) |
| Heath to Marco de Canavezes | 3,771.40 mi (6,069.48 km) |
| Heath to Marinha Grande | 3,776.93 mi (6,078.38 km) |
| Heath to Massama | 3,790.69 mi (6,100.52 km) |
| Heath to Matosinhos | 3,745.50 mi (6,027.80 km) |
| Heath to Mealhada | 3,780.96 mi (6,084.87 km) |
| Heath to Melgaco | 3,738.77 mi (6,016.97 km) |
| Heath to Melres | 3,763.06 mi (6,056.06 km) |
| Heath to Mira | 3,766.02 mi (6,060.83 km) |
| Heath to Miranda do Corvo | 3,795.00 mi (6,107.47 km) |
| Heath to Mirandela | 3,807.86 mi (6,128.16 km) |
| Heath to Mogadouro | 3,834.13 mi (6,170.43 km) |
| Heath to Moimenta da Beira | 3,802.67 mi (6,119.80 km) |
| Heath to Moita | 3,808.05 mi (6,128.46 km) |
| Heath to Moncao | 3,730.07 mi (6,002.96 km) |
