| Alton to Oliveira de Frades | 798.80 mi (1,285.54 km) |
| Alton to Oliveira do Bairro | 818.07 mi (1,316.56 km) |
| Alton to Oliveira do Hospital | 815.26 mi (1,312.04 km) |
| Alton to Ourem | 874.61 mi (1,407.55 km) |
| Alton to Ovar | 798.85 mi (1,285.63 km) |
| Alton to Pacos de Ferreira | 768.67 mi (1,237.05 km) |
| Alton to Palmela | 950.75 mi (1,530.08 km) |
| Alton to Paredes | 771.41 mi (1,241.46 km) |
| Alton to Paredes de Coura | 732.12 mi (1,178.24 km) |
| Alton to Penacova | 829.24 mi (1,334.54 km) |
| Alton to Penafiel | 769.97 mi (1,239.15 km) |
| Alton to Peniche | 910.33 mi (1,465.03 km) |
| Alton to Peso da Regua | 761.97 mi (1,226.28 km) |
| Alton to Pinhal Novo | 946.89 mi (1,523.87 km) |
| Alton to Pinhel | 773.00 mi (1,244.03 km) |
