| Marlborough to Mangualde | 3,224.10 mi (5,188.69 km) |
| Marlborough to Marco de Canavezes | 3,189.30 mi (5,132.68 km) |
| Marlborough to Marinha Grande | 3,192.18 mi (5,137.32 km) |
| Marlborough to Massama | 3,204.60 mi (5,157.31 km) |
| Marlborough to Matosinhos | 3,163.07 mi (5,090.47 km) |
| Marlborough to Mealhada | 3,197.36 mi (5,145.66 km) |
| Marlborough to Melgaco | 3,158.36 mi (5,082.89 km) |
| Marlborough to Melres | 3,180.60 mi (5,118.69 km) |
| Marlborough to Mira | 3,182.35 mi (5,121.50 km) |
| Marlborough to Miranda do Corvo | 3,211.05 mi (5,167.68 km) |
| Marlborough to Mirandela | 3,226.92 mi (5,193.23 km) |
| Marlborough to Mogadouro | 3,253.21 mi (5,235.53 km) |
| Marlborough to Moimenta da Beira | 3,220.53 mi (5,182.95 km) |
| Marlborough to Moita | 3,221.96 mi (5,185.25 km) |
| Marlborough to Moncao | 3,149.43 mi (5,068.52 km) |
