| Twickenham to Mangualde | 828.62 mi (1,333.53 km) |
| Twickenham to Marco de Canavezes | 800.25 mi (1,287.88 km) |
| Twickenham to Marinha Grande | 907.43 mi (1,460.37 km) |
| Twickenham to Massama | 977.60 mi (1,573.29 km) |
| Twickenham to Matosinhos | 812.64 mi (1,307.82 km) |
| Twickenham to Mealhada | 857.05 mi (1,379.28 km) |
| Twickenham to Melgaco | 745.01 mi (1,198.97 km) |
| Twickenham to Melres | 813.07 mi (1,308.52 km) |
| Twickenham to Mira | 860.10 mi (1,384.20 km) |
| Twickenham to Miranda do Corvo | 872.48 mi (1,404.12 km) |
| Twickenham to Mirandela | 760.79 mi (1,224.38 km) |
| Twickenham to Mogadouro | 761.48 mi (1,225.48 km) |
| Twickenham to Moimenta da Beira | 801.72 mi (1,290.24 km) |
| Twickenham to Moita | 978.27 mi (1,574.38 km) |
| Twickenham to Moncao | 752.73 mi (1,211.40 km) |
