| Harborne to Mangualde | 863.77 mi (1,390.10 km) |
| Harborne to Marco de Canavezes | 831.70 mi (1,338.49 km) |
| Harborne to Marinha Grande | 938.66 mi (1,510.63 km) |
| Harborne to Massama | 1,009.56 mi (1,624.73 km) |
| Harborne to Matosinhos | 841.07 mi (1,353.57 km) |
| Harborne to Mealhada | 889.11 mi (1,430.88 km) |
| Harborne to Melgaco | 772.82 mi (1,243.73 km) |
| Harborne to Melres | 843.49 mi (1,357.47 km) |
| Harborne to Mira | 890.54 mi (1,433.19 km) |
| Harborne to Miranda do Corvo | 905.88 mi (1,457.88 km) |
| Harborne to Mirandela | 796.85 mi (1,282.41 km) |
| Harborne to Mogadouro | 800.59 mi (1,288.43 km) |
| Harborne to Moimenta da Beira | 836.70 mi (1,346.54 km) |
| Harborne to Moita | 1,011.86 mi (1,628.43 km) |
| Harborne to Moncao | 779.45 mi (1,254.41 km) |
