| Clarksburg to Oliveira de Frades | 3,560.25 mi (5,729.67 km) |
| Clarksburg to Oliveira do Bairro | 3,550.17 mi (5,713.45 km) |
| Clarksburg to Oliveira do Hospital | 3,585.31 mi (5,770.00 km) |
| Clarksburg to Ourem | 3,570.09 mi (5,745.51 km) |
| Clarksburg to Ovar | 3,534.54 mi (5,688.29 km) |
| Clarksburg to Pacos de Ferreira | 3,535.43 mi (5,689.72 km) |
| Clarksburg to Palmela | 3,583.41 mi (5,766.93 km) |
| Clarksburg to Paredes | 3,540.37 mi (5,697.67 km) |
| Clarksburg to Paredes de Coura | 3,511.16 mi (5,650.67 km) |
| Clarksburg to Penacova | 3,567.23 mi (5,740.91 km) |
| Clarksburg to Penafiel | 3,542.59 mi (5,701.25 km) |
| Clarksburg to Peniche | 3,538.94 mi (5,695.37 km) |
| Clarksburg to Peso da Regua | 3,568.09 mi (5,742.29 km) |
| Clarksburg to Pinhal Novo | 3,580.93 mi (5,762.95 km) |
| Clarksburg to Pinhel | 3,612.41 mi (5,813.62 km) |
