| Overlea to Mangualde | 3,543.34 mi (5,702.45 km) |
| Overlea to Marco de Canavezes | 3,509.38 mi (5,647.81 km) |
| Overlea to Marinha Grande | 3,508.92 mi (5,647.07 km) |
| Overlea to Massama | 3,518.94 mi (5,663.19 km) |
| Overlea to Matosinhos | 3,482.84 mi (5,605.08 km) |
| Overlea to Mealhada | 3,515.73 mi (5,658.02 km) |
| Overlea to Melgaco | 3,480.07 mi (5,600.63 km) |
| Overlea to Melres | 3,500.33 mi (5,633.23 km) |
| Overlea to Mira | 3,500.63 mi (5,633.72 km) |
| Overlea to Miranda do Corvo | 3,528.92 mi (5,679.25 km) |
| Overlea to Mirandela | 3,548.11 mi (5,710.14 km) |
| Overlea to Mogadouro | 3,574.39 mi (5,752.43 km) |
| Overlea to Moimenta da Beira | 3,540.56 mi (5,697.99 km) |
| Overlea to Moita | 3,536.30 mi (5,691.12 km) |
| Overlea to Moncao | 3,470.95 mi (5,585.96 km) |
