| Dumbarton to Oliveira de Frades | 1,065.18 mi (1,714.24 km) |
| Dumbarton to Oliveira do Bairro | 1,081.15 mi (1,739.95 km) |
| Dumbarton to Oliveira do Hospital | 1,087.59 mi (1,750.30 km) |
| Dumbarton to Ourem | 1,140.94 mi (1,836.17 km) |
| Dumbarton to Ovar | 1,058.25 mi (1,703.09 km) |
| Dumbarton to Pacos de Ferreira | 1,029.12 mi (1,656.21 km) |
| Dumbarton to Palmela | 1,217.54 mi (1,959.45 km) |
| Dumbarton to Paredes | 1,033.18 mi (1,662.74 km) |
| Dumbarton to Paredes de Coura | 986.28 mi (1,587.26 km) |
| Dumbarton to Penacova | 1,096.43 mi (1,764.53 km) |
| Dumbarton to Penafiel | 1,032.41 mi (1,661.50 km) |
| Dumbarton to Peniche | 1,167.81 mi (1,879.40 km) |
| Dumbarton to Peso da Regua | 1,031.73 mi (1,660.41 km) |
| Dumbarton to Pinhal Novo | 1,213.25 mi (1,952.54 km) |
| Dumbarton to Pinhel | 1,054.01 mi (1,696.26 km) |
