| Barton upon Irwell to Mangualde | 924.33 mi (1,487.57 km) |
| Barton upon Irwell to Marco de Canavezes | 890.84 mi (1,433.66 km) |
| Barton upon Irwell to Marinha Grande | 997.32 mi (1,605.04 km) |
| Barton upon Irwell to Massama | 1,068.33 mi (1,719.31 km) |
| Barton upon Irwell to Matosinhos | 898.86 mi (1,446.58 km) |
| Barton upon Irwell to Mealhada | 948.29 mi (1,526.13 km) |
| Barton upon Irwell to Melgaco | 830.64 mi (1,336.79 km) |
| Barton upon Irwell to Melres | 902.14 mi (1,451.85 km) |
| Barton upon Irwell to Mira | 949.03 mi (1,527.31 km) |
| Barton upon Irwell to Miranda do Corvo | 965.58 mi (1,553.95 km) |
| Barton upon Irwell to Mirandela | 858.02 mi (1,380.86 km) |
| Barton upon Irwell to Mogadouro | 862.95 mi (1,388.78 km) |
| Barton upon Irwell to Moimenta da Beira | 897.29 mi (1,444.05 km) |
| Barton upon Irwell to Moita | 1,071.32 mi (1,724.12 km) |
| Barton upon Irwell to Moncao | 836.77 mi (1,346.65 km) |
