| Heerlen to Marco de Canavezes | 950.22 mi (1,529.23 km) |
| Heerlen to Marinha Grande | 1,052.96 mi (1,694.57 km) |
| Heerlen to Massama | 1,118.60 mi (1,800.21 km) |
| Heerlen to Matosinhos | 968.93 mi (1,559.34 km) |
| Heerlen to Mealhada | 1,002.81 mi (1,613.86 km) |
| Heerlen to Melgaco | 906.14 mi (1,458.29 km) |
| Heerlen to Melres | 964.79 mi (1,552.68 km) |
| Heerlen to Mira | 1,009.54 mi (1,624.70 km) |
| Heerlen to Miranda do Corvo | 1,014.32 mi (1,632.38 km) |
| Heerlen to Mirandela | 901.96 mi (1,451.57 km) |
| Heerlen to Mogadouro | 895.02 mi (1,440.40 km) |
| Heerlen to Moimenta da Beira | 943.22 mi (1,517.96 km) |
| Heerlen to Moita | 1,115.27 mi (1,794.85 km) |
| Heerlen to Moncao | 915.82 mi (1,473.87 km) |
| Heerlen to Montalegre | 904.68 mi (1,455.95 km) |
