| Trowbridge to Mangualde | 786.39 mi (1,265.57 km) |
| Trowbridge to Marco de Canavezes | 755.11 mi (1,215.23 km) |
| Trowbridge to Marinha Grande | 862.24 mi (1,387.64 km) |
| Trowbridge to Massama | 933.02 mi (1,501.55 km) |
| Trowbridge to Matosinhos | 765.25 mi (1,231.55 km) |
| Trowbridge to Mealhada | 812.44 mi (1,307.49 km) |
| Trowbridge to Melgaco | 697.07 mi (1,121.82 km) |
| Trowbridge to Melres | 767.16 mi (1,234.63 km) |
| Trowbridge to Mira | 814.27 mi (1,310.43 km) |
| Trowbridge to Miranda do Corvo | 828.92 mi (1,334.02 km) |
| Trowbridge to Mirandela | 719.22 mi (1,157.48 km) |
| Trowbridge to Mogadouro | 722.41 mi (1,162.61 km) |
| Trowbridge to Moimenta da Beira | 759.33 mi (1,222.02 km) |
| Trowbridge to Moita | 934.94 mi (1,504.65 km) |
| Trowbridge to Moncao | 704.01 mi (1,132.99 km) |
