| Owings Mills to Mangualde | 3,555.21 mi (5,721.56 km) |
| Owings Mills to Marco de Canavezes | 3,521.18 mi (5,666.78 km) |
| Owings Mills to Marinha Grande | 3,521.03 mi (5,666.55 km) |
| Owings Mills to Massama | 3,531.24 mi (5,682.99 km) |
| Owings Mills to Matosinhos | 3,494.66 mi (5,624.11 km) |
| Owings Mills to Mealhada | 3,527.69 mi (5,677.27 km) |
| Owings Mills to Melgaco | 3,491.69 mi (5,619.33 km) |
| Owings Mills to Melres | 3,512.15 mi (5,652.27 km) |
| Owings Mills to Mira | 3,512.60 mi (5,652.98 km) |
| Owings Mills to Miranda do Corvo | 3,540.93 mi (5,698.57 km) |
| Owings Mills to Mirandela | 3,559.79 mi (5,728.93 km) |
| Owings Mills to Mogadouro | 3,586.07 mi (5,771.22 km) |
| Owings Mills to Moimenta da Beira | 3,552.36 mi (5,716.97 km) |
| Owings Mills to Moita | 3,548.60 mi (5,710.92 km) |
| Owings Mills to Moncao | 3,482.59 mi (5,604.69 km) |
