| Ovar to Mangualde | 49.13 mi (79.07 km) |
| Ovar to Marco de Canavezes | 33.36 mi (53.69 km) |
| Ovar to Marinha Grande | 78.76 mi (126.75 km) |
| Ovar to Massama | 149.70 mi (240.92 km) |
| Ovar to Matosinhos | 22.15 mi (35.65 km) |
| Ovar to Mealhada | 34.76 mi (55.93 km) |
| Ovar to Melgaco | 88.43 mi (142.31 km) |
| Ovar to Melres | 18.41 mi (29.64 km) |
| Ovar to Mira | 30.40 mi (48.92 km) |
| Ovar to Miranda do Corvo | 55.27 mi (88.95 km) |
| Ovar to Mirandela | 86.75 mi (139.61 km) |
| Ovar to Mogadouro | 104.87 mi (168.77 km) |
| Ovar to Moimenta da Beira | 53.80 mi (86.59 km) |
| Ovar to Moita | 154.28 mi (248.29 km) |
| Ovar to Moncao | 83.74 mi (134.77 km) |
