| Greenock to Oliveira de Frades | 1,063.84 mi (1,712.08 km) |
| Greenock to Oliveira do Bairro | 1,079.71 mi (1,737.62 km) |
| Greenock to Oliveira do Hospital | 1,086.38 mi (1,748.37 km) |
| Greenock to Ourem | 1,139.53 mi (1,833.89 km) |
| Greenock to Ovar | 1,056.73 mi (1,700.64 km) |
| Greenock to Pacos de Ferreira | 1,027.66 mi (1,653.86 km) |
| Greenock to Palmela | 1,216.08 mi (1,957.09 km) |
| Greenock to Paredes | 1,031.75 mi (1,660.44 km) |
| Greenock to Paredes de Coura | 984.70 mi (1,584.72 km) |
| Greenock to Penacova | 1,095.07 mi (1,762.35 km) |
| Greenock to Penafiel | 1,030.99 mi (1,659.22 km) |
| Greenock to Peniche | 1,166.13 mi (1,876.71 km) |
| Greenock to Peso da Regua | 1,030.51 mi (1,658.45 km) |
| Greenock to Pinhal Novo | 1,211.78 mi (1,950.17 km) |
| Greenock to Pinhel | 1,053.08 mi (1,694.77 km) |
