| Southborough to Oliveira de Frades | 826.65 mi (1,330.36 km) |
| Southborough to Oliveira do Bairro | 846.44 mi (1,362.21 km) |
| Southborough to Oliveira do Hospital | 841.66 mi (1,354.52 km) |
| Southborough to Ourem | 901.81 mi (1,451.33 km) |
| Southborough to Ovar | 828.16 mi (1,332.79 km) |
| Southborough to Pacos de Ferreira | 798.05 mi (1,284.33 km) |
| Southborough to Palmela | 977.29 mi (1,572.79 km) |
| Southborough to Paredes | 800.49 mi (1,288.27 km) |
| Southborough to Paredes de Coura | 763.15 mi (1,228.17 km) |
| Southborough to Penacova | 856.65 mi (1,378.64 km) |
| Southborough to Penafiel | 798.93 mi (1,285.75 km) |
| Southborough to Peniche | 939.08 mi (1,511.31 km) |
| Southborough to Peso da Regua | 789.45 mi (1,270.50 km) |
| Southborough to Pinhal Novo | 973.54 mi (1,566.77 km) |
| Southborough to Pinhel | 797.78 mi (1,283.91 km) |
