| Caister-on-Sea to Oliveira de Frades | 947.13 mi (1,524.27 km) |
| Caister-on-Sea to Oliveira do Bairro | 966.88 mi (1,556.05 km) |
| Caister-on-Sea to Oliveira do Hospital | 962.20 mi (1,548.51 km) |
| Caister-on-Sea to Ourem | 1,022.34 mi (1,645.29 km) |
| Caister-on-Sea to Ovar | 948.49 mi (1,526.44 km) |
| Caister-on-Sea to Pacos de Ferreira | 918.36 mi (1,477.96 km) |
| Caister-on-Sea to Palmela | 1,097.82 mi (1,766.78 km) |
| Caister-on-Sea to Paredes | 920.85 mi (1,481.96 km) |
| Caister-on-Sea to Paredes de Coura | 883.13 mi (1,421.26 km) |
| Caister-on-Sea to Penacova | 977.16 mi (1,572.59 km) |
| Caister-on-Sea to Penafiel | 919.30 mi (1,479.47 km) |
| Caister-on-Sea to Peniche | 1,059.50 mi (1,705.10 km) |
| Caister-on-Sea to Peso da Regua | 909.95 mi (1,464.43 km) |
| Caister-on-Sea to Pinhal Novo | 1,094.08 mi (1,760.75 km) |
| Caister-on-Sea to Pinhel | 918.27 mi (1,477.81 km) |
