| Castelnaudary to Marco de Canavezes | 537.00 mi (864.21 km) |
| Castelnaudary to Marinha Grande | 614.07 mi (988.26 km) |
| Castelnaudary to Massama | 663.86 mi (1,068.38 km) |
| Castelnaudary to Matosinhos | 564.04 mi (907.74 km) |
| Castelnaudary to Mealhada | 572.07 mi (920.66 km) |
| Castelnaudary to Melgaco | 525.08 mi (845.04 km) |
| Castelnaudary to Melres | 551.95 mi (888.28 km) |
| Castelnaudary to Mira | 584.31 mi (940.36 km) |
| Castelnaudary to Miranda do Corvo | 574.81 mi (925.07 km) |
| Castelnaudary to Mirandela | 482.72 mi (776.86 km) |
| Castelnaudary to Mogadouro | 463.40 mi (745.78 km) |
| Castelnaudary to Moimenta da Beira | 515.69 mi (829.93 km) |
| Castelnaudary to Moita | 654.55 mi (1,053.40 km) |
| Castelnaudary to Moncao | 536.41 mi (863.27 km) |
| Castelnaudary to Montalegre | 506.22 mi (814.68 km) |
