| Clay to Olivares | 4,385.58 mi (7,057.91 km) |
| Clay to Olivenza | 4,303.71 mi (6,926.15 km) |
| Clay to Olot | 4,665.74 mi (7,508.78 km) |
| Clay to Onate | 4,414.22 mi (7,104.00 km) |
| Clay to Onda | 4,602.36 mi (7,406.79 km) |
| Clay to Onteniente | 4,619.54 mi (7,434.44 km) |
| Clay to Orihuela | 4,624.92 mi (7,443.09 km) |
| Clay to Osuna | 4,443.48 mi (7,151.09 km) |
| Clay to Ourense | 4,174.52 mi (6,718.24 km) |
| Clay to Oviedo | 4,245.51 mi (6,832.50 km) |
| Clay to Paiporta | 4,610.72 mi (7,420.24 km) |
| Clay to Pajara | 4,220.58 mi (6,792.36 km) |
| Clay to Palafolls | 4,693.35 mi (7,553.22 km) |
| Clay to Palafrugell | 4,704.85 mi (7,571.72 km) |
| Clay to Palamos | 4,705.46 mi (7,572.70 km) |
