| Portici to Montemor-o-Novo | 1,204.53 mi (1,938.50 km) |
| Portici to Montemor-o-Velho | 1,207.16 mi (1,942.74 km) |
| Portici to Montijo | 1,239.69 mi (1,995.09 km) |
| Portici to Mortagua | 1,180.82 mi (1,900.34 km) |
| Portici to Moura | 1,173.76 mi (1,888.98 km) |
| Portici to Murtosa | 1,198.61 mi (1,928.98 km) |
| Portici to Nazare | 1,234.32 mi (1,986.45 km) |
| Portici to Nelas | 1,160.04 mi (1,866.91 km) |
| Portici to Obidos | 1,242.50 mi (1,999.62 km) |
| Portici to Odemira | 1,246.51 mi (2,006.07 km) |
| Portici to Odivelas | 1,252.52 mi (2,015.73 km) |
| Portici to Oeiras | 1,261.48 mi (2,030.15 km) |
| Portici to Olhao | 1,217.32 mi (1,959.09 km) |
| Portici to Oliveira de Azemeis | 1,189.42 mi (1,914.19 km) |
| Portici to Oliveira de Frades | 1,175.42 mi (1,891.66 km) |
