| South Portland to Oliveira de Frades | 3,111.13 mi (5,006.89 km) |
| South Portland to Oliveira do Bairro | 3,102.03 mi (4,992.23 km) |
| South Portland to Oliveira do Hospital | 3,136.98 mi (5,048.48 km) |
| South Portland to Ourem | 3,124.86 mi (5,028.97 km) |
| South Portland to Ovar | 3,085.42 mi (4,965.51 km) |
| South Portland to Pacos de Ferreira | 3,084.83 mi (4,964.56 km) |
| South Portland to Palmela | 3,142.32 mi (5,057.08 km) |
| South Portland to Paredes | 3,089.91 mi (4,972.73 km) |
| South Portland to Paredes de Coura | 3,058.78 mi (4,922.63 km) |
| South Portland to Penacova | 3,119.64 mi (5,020.58 km) |
| South Portland to Penafiel | 3,092.06 mi (4,976.20 km) |
| South Portland to Peniche | 3,095.69 mi (4,982.04 km) |
| South Portland to Peso da Regua | 3,117.19 mi (5,016.63 km) |
| South Portland to Pinhal Novo | 3,139.64 mi (5,052.75 km) |
| South Portland to Pinhel | 3,161.94 mi (5,088.65 km) |
