| Romeoville to Oliveira de Frades | 3,995.12 mi (6,429.52 km) |
| Romeoville to Oliveira do Bairro | 3,987.50 mi (6,417.26 km) |
| Romeoville to Oliveira do Hospital | 4,022.02 mi (6,472.81 km) |
| Romeoville to Ourem | 4,014.21 mi (6,460.25 km) |
| Romeoville to Ovar | 3,969.53 mi (6,388.34 km) |
| Romeoville to Pacos de Ferreira | 3,966.61 mi (6,383.65 km) |
| Romeoville to Palmela | 4,036.49 mi (6,496.10 km) |
| Romeoville to Paredes | 3,971.89 mi (6,392.14 km) |
| Romeoville to Paredes de Coura | 3,937.65 mi (6,337.03 km) |
| Romeoville to Penacova | 4,005.83 mi (6,446.76 km) |
| Romeoville to Penafiel | 3,973.92 mi (6,395.41 km) |
| Romeoville to Peniche | 3,987.61 mi (6,417.43 km) |
| Romeoville to Peso da Regua | 3,998.29 mi (6,434.63 km) |
| Romeoville to Pinhal Novo | 4,033.58 mi (6,491.43 km) |
| Romeoville to Pinhel | 4,043.54 mi (6,507.44 km) |
