| Barreiro to Marco de Canavezes | 180.53 mi (290.54 km) |
| Barreiro to Marinha Grande | 75.19 mi (121.00 km) |
| Barreiro to Massama | 12.83 mi (20.65 km) |
| Barreiro to Matosinhos | 174.96 mi (281.57 km) |
| Barreiro to Mealhada | 123.07 mi (198.07 km) |
| Barreiro to Melgaco | 242.06 mi (389.55 km) |
| Barreiro to Melres | 169.55 mi (272.86 km) |
| Barreiro to Mira | 123.35 mi (198.51 km) |
| Barreiro to Miranda do Corvo | 106.49 mi (171.39 km) |
| Barreiro to Mirandela | 218.75 mi (352.04 km) |
| Barreiro to Mogadouro | 222.28 mi (357.72 km) |
| Barreiro to Moimenta da Beira | 177.44 mi (285.55 km) |
| Barreiro to Moita | 4.65 mi (7.48 km) |
| Barreiro to Moncao | 237.39 mi (382.04 km) |
| Barreiro to Montalegre | 228.21 mi (367.27 km) |
