| Heiloo to Marco de Canavezes | 992.51 mi (1,597.29 km) |
| Heiloo to Marinha Grande | 1,098.23 mi (1,767.42 km) |
| Heiloo to Massama | 1,166.47 mi (1,877.25 km) |
| Heiloo to Matosinhos | 1,008.31 mi (1,622.72 km) |
| Heiloo to Mealhada | 1,047.57 mi (1,685.90 km) |
| Heiloo to Melgaco | 942.54 mi (1,516.88 km) |
| Heiloo to Melres | 1,006.37 mi (1,619.60 km) |
| Heiloo to Mira | 1,052.60 mi (1,693.99 km) |
| Heiloo to Miranda do Corvo | 1,061.03 mi (1,707.56 km) |
| Heiloo to Mirandela | 947.94 mi (1,525.57 km) |
| Heiloo to Mogadouro | 944.42 mi (1,519.90 km) |
| Heiloo to Moimenta da Beira | 989.46 mi (1,592.38 km) |
| Heiloo to Moita | 1,164.99 mi (1,874.86 km) |
| Heiloo to Moncao | 951.33 mi (1,531.02 km) |
| Heiloo to Montalegre | 945.40 mi (1,521.48 km) |
