| Portes-les-Valence to Marco de Canavezes | 704.61 mi (1,133.96 km) |
| Portes-les-Valence to Marinha Grande | 787.98 mi (1,268.14 km) |
| Portes-les-Valence to Massama | 840.66 mi (1,352.91 km) |
| Portes-les-Valence to Matosinhos | 730.48 mi (1,175.60 km) |
| Portes-les-Valence to Mealhada | 743.92 mi (1,197.22 km) |
| Portes-les-Valence to Melgaco | 684.86 mi (1,102.18 km) |
| Portes-les-Valence to Melres | 719.83 mi (1,158.46 km) |
| Portes-les-Valence to Mira | 755.33 mi (1,215.58 km) |
| Portes-les-Valence to Miranda do Corvo | 748.29 mi (1,204.26 km) |
| Portes-les-Valence to Mirandela | 650.28 mi (1,046.53 km) |
| Portes-les-Valence to Mogadouro | 633.18 mi (1,019.00 km) |
| Portes-les-Valence to Moimenta da Beira | 685.84 mi (1,103.75 km) |
| Portes-les-Valence to Moita | 832.05 mi (1,339.06 km) |
| Portes-les-Valence to Moncao | 696.15 mi (1,120.35 km) |
| Portes-les-Valence to Montalegre | 669.64 mi (1,077.68 km) |
