| Williamstown to Montalegre | 3,426.68 mi (5,514.71 km) |
| Williamstown to Montemor-o-Novo | 3,489.78 mi (5,616.26 km) |
| Williamstown to Montemor-o-Velho | 3,426.00 mi (5,513.61 km) |
| Williamstown to Montijo | 3,455.05 mi (5,560.37 km) |
| Williamstown to Mortagua | 3,440.97 mi (5,537.70 km) |
| Williamstown to Moura | 3,542.22 mi (5,700.65 km) |
| Williamstown to Murtosa | 3,413.74 mi (5,493.88 km) |
| Williamstown to Nazare | 3,422.13 mi (5,507.39 km) |
| Williamstown to Nelas | 3,457.43 mi (5,564.19 km) |
| Williamstown to Obidos | 3,424.08 mi (5,510.52 km) |
| Williamstown to Odemira | 3,498.99 mi (5,631.08 km) |
| Williamstown to Odivelas | 3,438.28 mi (5,533.38 km) |
| Williamstown to Oeiras | 3,434.40 mi (5,527.14 km) |
| Williamstown to Olhao | 3,554.61 mi (5,720.59 km) |
| Williamstown to Oliveira de Azemeis | 3,418.68 mi (5,501.84 km) |
