| Castelsarrasin to Marco de Canavezes | 510.04 mi (820.84 km) |
| Castelsarrasin to Marinha Grande | 594.79 mi (957.22 km) |
| Castelsarrasin to Massama | 649.42 mi (1,045.13 km) |
| Castelsarrasin to Matosinhos | 535.89 mi (862.43 km) |
| Castelsarrasin to Mealhada | 550.00 mi (885.14 km) |
| Castelsarrasin to Melgaco | 491.05 mi (790.28 km) |
| Castelsarrasin to Melres | 525.27 mi (845.34 km) |
| Castelsarrasin to Mira | 561.17 mi (903.12 km) |
| Castelsarrasin to Miranda do Corvo | 554.97 mi (893.13 km) |
| Castelsarrasin to Mirandela | 455.73 mi (733.43 km) |
| Castelsarrasin to Mogadouro | 438.91 mi (706.36 km) |
| Castelsarrasin to Moimenta da Beira | 491.58 mi (791.12 km) |
| Castelsarrasin to Moita | 641.60 mi (1,032.56 km) |
| Castelsarrasin to Moncao | 502.37 mi (808.49 km) |
| Castelsarrasin to Montalegre | 475.21 mi (764.78 km) |
