| Greenford to Mangualde | 833.31 mi (1,341.09 km) |
| Greenford to Marco de Canavezes | 804.81 mi (1,295.21 km) |
| Greenford to Marinha Grande | 912.00 mi (1,467.73 km) |
| Greenford to Massama | 982.21 mi (1,580.71 km) |
| Greenford to Matosinhos | 817.09 mi (1,314.99 km) |
| Greenford to Mealhada | 861.64 mi (1,386.67 km) |
| Greenford to Melgaco | 749.42 mi (1,206.07 km) |
| Greenford to Melres | 817.60 mi (1,315.79 km) |
| Greenford to Mira | 864.64 mi (1,391.50 km) |
| Greenford to Miranda do Corvo | 877.12 mi (1,411.59 km) |
| Greenford to Mirandela | 765.50 mi (1,231.96 km) |
| Greenford to Mogadouro | 766.29 mi (1,233.22 km) |
| Greenford to Moimenta da Beira | 806.40 mi (1,297.78 km) |
| Greenford to Moita | 982.94 mi (1,581.89 km) |
| Greenford to Moncao | 757.10 mi (1,218.44 km) |
