| Preston to Montalegre | 857.34 mi (1,379.76 km) |
| Preston to Montemor-o-Novo | 1,075.94 mi (1,731.56 km) |
| Preston to Montemor-o-Velho | 979.75 mi (1,576.75 km) |
| Preston to Montijo | 1,081.96 mi (1,741.25 km) |
| Preston to Mortagua | 956.08 mi (1,538.66 km) |
| Preston to Moura | 1,102.87 mi (1,774.90 km) |
| Preston to Murtosa | 941.23 mi (1,514.76 km) |
| Preston to Nazare | 1,022.78 mi (1,646.01 km) |
| Preston to Nelas | 945.81 mi (1,522.13 km) |
| Preston to Obidos | 1,040.18 mi (1,674.01 km) |
| Preston to Odemira | 1,152.77 mi (1,855.21 km) |
| Preston to Odivelas | 1,078.44 mi (1,735.59 km) |
| Preston to Oeiras | 1,087.45 mi (1,750.08 km) |
| Preston to Olhao | 1,181.97 mi (1,902.20 km) |
| Preston to Oliveira de Azemeis | 931.97 mi (1,499.86 km) |
