| Preston to Oliveira de Frades | 936.44 mi (1,507.05 km) |
| Preston to Oliveira do Bairro | 953.92 mi (1,535.18 km) |
| Preston to Oliveira do Hospital | 956.58 mi (1,539.47 km) |
| Preston to Ourem | 1,012.84 mi (1,630.01 km) |
| Preston to Ovar | 932.33 mi (1,500.44 km) |
| Preston to Pacos de Ferreira | 902.48 mi (1,452.40 km) |
| Preston to Palmela | 1,089.79 mi (1,753.85 km) |
| Preston to Paredes | 906.04 mi (1,458.12 km) |
| Preston to Paredes de Coura | 861.76 mi (1,386.86 km) |
| Preston to Penacova | 967.62 mi (1,557.24 km) |
| Preston to Penafiel | 904.98 mi (1,456.43 km) |
| Preston to Peniche | 1,043.62 mi (1,679.55 km) |
| Preston to Peso da Regua | 901.30 mi (1,450.50 km) |
| Preston to Pinhal Novo | 1,085.65 mi (1,747.19 km) |
| Preston to Pinhel | 919.17 mi (1,479.27 km) |
