| Merignac to Marco de Canavezes | 455.34 mi (732.81 km) |
| Merignac to Marinha Grande | 550.05 mi (885.23 km) |
| Merignac to Massama | 611.10 mi (983.46 km) |
| Merignac to Matosinhos | 478.67 mi (770.35 km) |
| Merignac to Mealhada | 501.94 mi (807.79 km) |
| Merignac to Melgaco | 425.72 mi (685.14 km) |
| Merignac to Melres | 470.60 mi (757.36 km) |
| Merignac to Mira | 511.18 mi (822.67 km) |
| Merignac to Miranda do Corvo | 510.27 mi (821.20 km) |
| Merignac to Mirandela | 402.60 mi (647.93 km) |
| Merignac to Mogadouro | 390.42 mi (628.31 km) |
| Merignac to Moimenta da Beira | 441.89 mi (711.15 km) |
| Merignac to Moita | 605.74 mi (974.84 km) |
| Merignac to Moncao | 436.76 mi (702.89 km) |
| Merignac to Montalegre | 415.07 mi (668.00 km) |
