| Gloucester to Mangualde | 820.87 mi (1,321.06 km) |
| Gloucester to Marco de Canavezes | 788.94 mi (1,269.68 km) |
| Gloucester to Marinha Grande | 895.94 mi (1,441.88 km) |
| Gloucester to Massama | 966.82 mi (1,555.95 km) |
| Gloucester to Matosinhos | 798.49 mi (1,285.04 km) |
| Gloucester to Mealhada | 846.34 mi (1,362.05 km) |
| Gloucester to Melgaco | 730.24 mi (1,175.22 km) |
| Gloucester to Melres | 800.79 mi (1,288.75 km) |
| Gloucester to Mira | 847.86 mi (1,364.49 km) |
| Gloucester to Miranda do Corvo | 863.05 mi (1,388.95 km) |
| Gloucester to Mirandela | 753.91 mi (1,213.30 km) |
| Gloucester to Mogadouro | 757.60 mi (1,219.24 km) |
| Gloucester to Moimenta da Beira | 793.80 mi (1,277.49 km) |
| Gloucester to Moita | 969.04 mi (1,559.52 km) |
| Gloucester to Moncao | 736.96 mi (1,186.02 km) |
