| Mercer Island to Oliveira de Frades | 5,123.60 mi (8,245.63 km) |
| Mercer Island to Oliveira do Bairro | 5,123.55 mi (8,245.55 km) |
| Mercer Island to Oliveira do Hospital | 5,153.38 mi (8,293.56 km) |
| Mercer Island to Ourem | 5,167.24 mi (8,315.86 km) |
| Mercer Island to Ovar | 5,100.54 mi (8,208.52 km) |
| Mercer Island to Pacos de Ferreira | 5,087.20 mi (8,187.06 km) |
| Mercer Island to Palmela | 5,213.29 mi (8,389.98 km) |
| Mercer Island to Paredes | 5,092.96 mi (8,196.33 km) |
| Mercer Island to Paredes de Coura | 5,047.68 mi (8,123.45 km) |
| Mercer Island to Penacova | 5,143.91 mi (8,278.32 km) |
| Mercer Island to Penafiel | 5,094.29 mi (8,198.47 km) |
| Mercer Island to Peniche | 5,155.71 mi (8,297.31 km) |
| Mercer Island to Peso da Regua | 5,113.36 mi (8,229.16 km) |
| Mercer Island to Pinhal Novo | 5,209.39 mi (8,383.71 km) |
| Mercer Island to Pinhel | 5,157.27 mi (8,299.83 km) |
