| Boston to Montalegre | 850.68 mi (1,369.03 km) |
| Boston to Montemor-o-Novo | 1,063.83 mi (1,712.06 km) |
| Boston to Montemor-o-Velho | 974.21 mi (1,567.83 km) |
| Boston to Montijo | 1,074.01 mi (1,728.45 km) |
| Boston to Mortagua | 948.36 mi (1,526.24 km) |
| Boston to Moura | 1,085.14 mi (1,746.36 km) |
| Boston to Murtosa | 936.97 mi (1,507.91 km) |
| Boston to Nazare | 1,018.11 mi (1,638.50 km) |
| Boston to Nelas | 935.80 mi (1,506.02 km) |
| Boston to Obidos | 1,035.44 mi (1,666.38 km) |
| Boston to Odemira | 1,140.90 mi (1,836.10 km) |
| Boston to Odivelas | 1,072.41 mi (1,725.87 km) |
| Boston to Oeiras | 1,081.96 mi (1,741.24 km) |
| Boston to Olhao | 1,164.57 mi (1,874.20 km) |
| Boston to Oliveira de Azemeis | 926.99 mi (1,491.85 km) |
