| Round Rock to Oliveira de Frades | 4,856.58 mi (7,815.91 km) |
| Round Rock to Oliveira do Bairro | 4,846.94 mi (7,800.40 km) |
| Round Rock to Oliveira do Hospital | 4,882.01 mi (7,856.83 km) |
| Round Rock to Ourem | 4,867.90 mi (7,834.13 km) |
| Round Rock to Ovar | 4,830.86 mi (7,774.52 km) |
| Round Rock to Pacos de Ferreira | 4,830.98 mi (7,774.72 km) |
| Round Rock to Palmela | 4,882.06 mi (7,856.91 km) |
| Round Rock to Paredes | 4,836.00 mi (7,782.79 km) |
| Round Rock to Paredes de Coura | 4,805.60 mi (7,733.87 km) |
| Round Rock to Penacova | 4,864.23 mi (7,828.23 km) |
| Round Rock to Penafiel | 4,838.18 mi (7,786.30 km) |
| Round Rock to Peniche | 4,837.23 mi (7,784.77 km) |
| Round Rock to Peso da Regua | 4,863.48 mi (7,827.01 km) |
| Round Rock to Pinhal Novo | 4,879.55 mi (7,852.88 km) |
| Round Rock to Pinhel | 4,908.05 mi (7,898.75 km) |
