| Williamstown to Oliveira de Frades | 3,436.02 mi (5,529.74 km) |
| Williamstown to Oliveira do Bairro | 3,425.81 mi (5,513.31 km) |
| Williamstown to Oliveira do Hospital | 3,460.97 mi (5,569.89 km) |
| Williamstown to Ourem | 3,445.36 mi (5,544.77 km) |
| Williamstown to Ovar | 3,410.32 mi (5,488.37 km) |
| Williamstown to Pacos de Ferreira | 3,411.43 mi (5,490.17 km) |
| Williamstown to Palmela | 3,458.25 mi (5,565.52 km) |
| Williamstown to Paredes | 3,416.35 mi (5,498.08 km) |
| Williamstown to Paredes de Coura | 3,387.47 mi (5,451.60 km) |
| Williamstown to Penacova | 3,442.80 mi (5,540.64 km) |
| Williamstown to Penafiel | 3,418.58 mi (5,501.67 km) |
| Williamstown to Peniche | 3,414.00 mi (5,494.30 km) |
| Williamstown to Peso da Regua | 3,444.14 mi (5,542.81 km) |
| Williamstown to Pinhal Novo | 3,455.79 mi (5,561.56 km) |
| Williamstown to Pinhel | 3,488.38 mi (5,614.00 km) |
