| Boston to Oliveira de Frades | 929.17 mi (1,495.36 km) |
| Boston to Oliveira do Bairro | 948.17 mi (1,525.93 km) |
| Boston to Oliveira do Hospital | 946.25 mi (1,522.84 km) |
| Boston to Ourem | 1,005.20 mi (1,617.72 km) |
| Boston to Ovar | 928.47 mi (1,494.23 km) |
| Boston to Pacos de Ferreira | 898.28 mi (1,445.65 km) |
| Boston to Palmela | 1,081.57 mi (1,740.62 km) |
| Boston to Paredes | 901.19 mi (1,450.32 km) |
| Boston to Paredes de Coura | 860.79 mi (1,385.31 km) |
| Boston to Penacova | 959.79 mi (1,544.64 km) |
| Boston to Penafiel | 899.82 mi (1,448.12 km) |
| Boston to Peniche | 1,040.12 mi (1,673.91 km) |
| Boston to Peso da Regua | 892.56 mi (1,436.44 km) |
| Boston to Pinhal Novo | 1,077.66 mi (1,734.33 km) |
| Boston to Pinhel | 904.57 mi (1,455.77 km) |
