| Preakness to Mangualde | 3,388.58 mi (5,453.39 km) |
| Preakness to Marco de Canavezes | 3,354.15 mi (5,397.98 km) |
| Preakness to Marinha Grande | 3,355.53 mi (5,400.20 km) |
| Preakness to Massama | 3,366.85 mi (5,418.41 km) |
| Preakness to Matosinhos | 3,327.78 mi (5,355.54 km) |
| Preakness to Mealhada | 3,361.44 mi (5,409.72 km) |
| Preakness to Melgaco | 3,323.93 mi (5,349.35 km) |
| Preakness to Melres | 3,345.29 mi (5,383.73 km) |
| Preakness to Mira | 3,346.39 mi (5,385.50 km) |
| Preakness to Miranda do Corvo | 3,374.91 mi (5,431.39 km) |
| Preakness to Mirandela | 3,392.27 mi (5,459.33 km) |
| Preakness to Mogadouro | 3,418.55 mi (5,501.63 km) |
| Preakness to Moimenta da Beira | 3,385.36 mi (5,448.22 km) |
| Preakness to Moita | 3,384.21 mi (5,446.36 km) |
| Preakness to Moncao | 3,314.92 mi (5,334.84 km) |
