| Severn to Olivares | 3,726.68 mi (5,997.51 km) |
| Severn to Olivenza | 3,643.13 mi (5,863.05 km) |
| Severn to Olot | 3,999.24 mi (6,436.15 km) |
| Severn to Onate | 3,747.87 mi (6,031.62 km) |
| Severn to Onda | 3,937.28 mi (6,336.44 km) |
| Severn to Onteniente | 3,955.63 mi (6,365.97 km) |
| Severn to Orihuela | 3,961.99 mi (6,376.21 km) |
| Severn to Osuna | 3,784.21 mi (6,090.10 km) |
| Severn to Ourense | 3,509.50 mi (5,648.00 km) |
| Severn to Oviedo | 3,579.42 mi (5,760.52 km) |
| Severn to Paiporta | 3,946.15 mi (6,350.71 km) |
| Severn to Pajara | 3,601.70 mi (5,796.37 km) |
| Severn to Palafolls | 4,026.91 mi (6,480.69 km) |
| Severn to Palafrugell | 4,038.35 mi (6,499.09 km) |
| Severn to Palamos | 4,038.97 mi (6,500.09 km) |
