| Castel San Giorgio to Montemor-o-Novo | 1,223.32 mi (1,968.74 km) |
| Castel San Giorgio to Montemor-o-Velho | 1,226.09 mi (1,973.20 km) |
| Castel San Giorgio to Montijo | 1,258.50 mi (2,025.36 km) |
| Castel San Giorgio to Mortagua | 1,199.75 mi (1,930.81 km) |
| Castel San Giorgio to Moura | 1,192.44 mi (1,919.05 km) |
| Castel San Giorgio to Murtosa | 1,217.55 mi (1,959.46 km) |
| Castel San Giorgio to Nazare | 1,253.22 mi (2,016.86 km) |
| Castel San Giorgio to Nelas | 1,178.98 mi (1,897.38 km) |
| Castel San Giorgio to Obidos | 1,261.39 mi (2,030.00 km) |
| Castel San Giorgio to Odemira | 1,265.15 mi (2,036.06 km) |
| Castel San Giorgio to Odivelas | 1,271.34 mi (2,046.03 km) |
| Castel San Giorgio to Oeiras | 1,280.29 mi (2,060.43 km) |
| Castel San Giorgio to Olhao | 1,235.80 mi (1,988.83 km) |
| Castel San Giorgio to Oliveira de Azemeis | 1,208.36 mi (1,944.67 km) |
| Castel San Giorgio to Oliveira de Frades | 1,194.36 mi (1,922.14 km) |
