| Oplotnica to Mangualde | 1,224.55 mi (1,970.73 km) |
| Oplotnica to Marco de Canavezes | 1,225.37 mi (1,972.04 km) |
| Oplotnica to Marinha Grande | 1,306.76 mi (2,103.03 km) |
| Oplotnica to Massama | 1,356.64 mi (2,183.30 km) |
| Oplotnica to Matosinhos | 1,251.31 mi (2,013.80 km) |
| Oplotnica to Mealhada | 1,263.74 mi (2,033.79 km) |
| Oplotnica to Melgaco | 1,205.05 mi (1,939.34 km) |
| Oplotnica to Melres | 1,240.57 mi (1,996.51 km) |
| Oplotnica to Mira | 1,275.46 mi (2,052.65 km) |
| Oplotnica to Miranda do Corvo | 1,267.31 mi (2,039.54 km) |
| Oplotnica to Mirandela | 1,171.01 mi (1,884.56 km) |
| Oplotnica to Mogadouro | 1,153.53 mi (1,856.42 km) |
| Oplotnica to Moimenta da Beira | 1,206.16 mi (1,941.12 km) |
| Oplotnica to Moita | 1,346.98 mi (2,167.76 km) |
| Oplotnica to Moncao | 1,216.30 mi (1,957.45 km) |
