| Portland to Montalegre | 5,191.52 mi (8,354.95 km) |
| Portland to Montemor-o-Novo | 5,342.39 mi (8,597.75 km) |
| Portland to Montemor-o-Velho | 5,247.01 mi (8,444.24 km) |
| Portland to Montijo | 5,316.48 mi (8,556.05 km) |
| Portland to Mortagua | 5,248.76 mi (8,447.07 km) |
| Portland to Moura | 5,396.52 mi (8,684.86 km) |
| Portland to Murtosa | 5,219.34 mi (8,399.72 km) |
| Portland to Nazare | 5,262.98 mi (8,469.95 km) |
| Portland to Nelas | 5,257.64 mi (8,461.35 km) |
| Portland to Obidos | 5,272.31 mi (8,484.96 km) |
| Portland to Odemira | 5,383.34 mi (8,663.65 km) |
| Portland to Odivelas | 5,300.98 mi (8,531.11 km) |
| Portland to Oeiras | 5,301.66 mi (8,532.19 km) |
| Portland to Olhao | 5,440.92 mi (8,756.31 km) |
| Portland to Oliveira de Azemeis | 5,219.27 mi (8,399.61 km) |
