| Arco to Montemor-o-Novo | 1,094.01 mi (1,760.63 km) |
| Arco to Montemor-o-Velho | 1,061.46 mi (1,708.26 km) |
| Arco to Montijo | 1,123.63 mi (1,808.30 km) |
| Arco to Mortagua | 1,031.86 mi (1,660.62 km) |
| Arco to Moura | 1,080.08 mi (1,738.21 km) |
| Arco to Murtosa | 1,041.04 mi (1,675.39 km) |
| Arco to Nazare | 1,098.30 mi (1,767.54 km) |
| Arco to Nelas | 1,011.36 mi (1,627.62 km) |
| Arco to Obidos | 1,110.92 mi (1,787.85 km) |
| Arco to Odemira | 1,154.65 mi (1,858.23 km) |
| Arco to Odivelas | 1,132.37 mi (1,822.37 km) |
| Arco to Oeiras | 1,142.56 mi (1,838.78 km) |
| Arco to Olhao | 1,143.25 mi (1,839.89 km) |
| Arco to Oliveira de Azemeis | 1,030.34 mi (1,658.17 km) |
| Arco to Oliveira de Frades | 1,020.52 mi (1,642.37 km) |
