| Clayton to Oliveira de Frades | 949.93 mi (1,528.76 km) |
| Clayton to Oliveira do Bairro | 967.85 mi (1,557.60 km) |
| Clayton to Oliveira do Hospital | 969.27 mi (1,559.89 km) |
| Clayton to Ourem | 1,026.36 mi (1,651.76 km) |
| Clayton to Ovar | 946.73 mi (1,523.62 km) |
| Clayton to Pacos de Ferreira | 916.73 mi (1,475.34 km) |
| Clayton to Palmela | 1,103.25 mi (1,775.52 km) |
| Clayton to Paredes | 920.12 mi (1,480.80 km) |
| Clayton to Paredes de Coura | 876.80 mi (1,411.07 km) |
| Clayton to Penacova | 981.01 mi (1,578.79 km) |
| Clayton to Penafiel | 918.98 mi (1,478.96 km) |
| Clayton to Peniche | 1,058.29 mi (1,703.16 km) |
| Clayton to Peso da Regua | 914.32 mi (1,471.46 km) |
| Clayton to Pinhal Novo | 1,099.17 mi (1,768.95 km) |
| Clayton to Pinhel | 930.62 mi (1,497.69 km) |
