| Williamstown to Mangualde | 3,459.45 mi (5,567.44 km) |
| Williamstown to Marco de Canavezes | 3,425.63 mi (5,513.02 km) |
| Williamstown to Marinha Grande | 3,424.71 mi (5,511.54 km) |
| Williamstown to Massama | 3,434.48 mi (5,527.27 km) |
| Williamstown to Matosinhos | 3,399.03 mi (5,470.22 km) |
| Williamstown to Mealhada | 3,431.72 mi (5,522.82 km) |
| Williamstown to Melgaco | 3,396.61 mi (5,466.32 km) |
| Williamstown to Melres | 3,416.52 mi (5,498.35 km) |
| Williamstown to Mira | 3,416.61 mi (5,498.50 km) |
| Williamstown to Miranda do Corvo | 3,444.85 mi (5,543.95 km) |
| Williamstown to Mirandela | 3,464.55 mi (5,575.65 km) |
| Williamstown to Mogadouro | 3,490.83 mi (5,617.94 km) |
| Williamstown to Moimenta da Beira | 3,456.80 mi (5,563.18 km) |
| Williamstown to Moita | 3,451.84 mi (5,555.20 km) |
| Williamstown to Moncao | 3,387.46 mi (5,451.59 km) |
