| Opovo to Mangualde | 1,453.37 mi (2,338.98 km) |
| Opovo to Marco de Canavezes | 1,458.09 mi (2,346.57 km) |
| Opovo to Marinha Grande | 1,533.15 mi (2,467.37 km) |
| Opovo to Massama | 1,578.28 mi (2,540.00 km) |
| Opovo to Matosinhos | 1,484.94 mi (2,389.77 km) |
| Opovo to Mealhada | 1,492.65 mi (2,402.19 km) |
| Opovo to Melgaco | 1,442.76 mi (2,321.90 km) |
| Opovo to Melres | 1,473.09 mi (2,370.71 km) |
| Opovo to Mira | 1,505.17 mi (2,422.34 km) |
| Opovo to Miranda do Corvo | 1,494.42 mi (2,405.03 km) |
| Opovo to Mirandela | 1,403.76 mi (2,259.13 km) |
| Opovo to Mogadouro | 1,384.59 mi (2,228.28 km) |
| Opovo to Moimenta da Beira | 1,436.82 mi (2,312.34 km) |
| Opovo to Moita | 1,567.33 mi (2,522.37 km) |
| Opovo to Moncao | 1,454.09 mi (2,340.13 km) |
