| Horndean to Mangualde | 782.61 mi (1,259.48 km) |
| Horndean to Marco de Canavezes | 753.92 mi (1,213.32 km) |
| Horndean to Marinha Grande | 861.13 mi (1,385.85 km) |
| Horndean to Massama | 931.37 mi (1,498.90 km) |
| Horndean to Matosinhos | 766.14 mi (1,232.98 km) |
| Horndean to Mealhada | 810.79 mi (1,304.83 km) |
| Horndean to Melgaco | 698.45 mi (1,124.05 km) |
| Horndean to Melres | 766.68 mi (1,233.86 km) |
| Horndean to Mira | 813.73 mi (1,309.57 km) |
| Horndean to Miranda do Corvo | 826.33 mi (1,329.85 km) |
| Horndean to Mirandela | 714.83 mi (1,150.41 km) |
| Horndean to Mogadouro | 715.84 mi (1,152.04 km) |
| Horndean to Moimenta da Beira | 755.68 mi (1,216.14 km) |
| Horndean to Moita | 932.18 mi (1,500.20 km) |
| Horndean to Moncao | 706.13 mi (1,136.41 km) |
