| Euclid to Olivares | 3,896.93 mi (6,271.51 km) |
| Euclid to Olivenza | 3,809.06 mi (6,130.08 km) |
| Euclid to Olot | 4,129.16 mi (6,645.25 km) |
| Euclid to Onate | 3,882.79 mi (6,248.74 km) |
| Euclid to Onda | 4,083.58 mi (6,571.89 km) |
| Euclid to Onteniente | 4,108.10 mi (6,611.35 km) |
| Euclid to Orihuela | 4,118.63 mi (6,628.30 km) |
| Euclid to Osuna | 3,953.26 mi (6,362.15 km) |
| Euclid to Ourense | 3,657.86 mi (5,886.76 km) |
| Euclid to Oviedo | 3,718.70 mi (5,984.67 km) |
| Euclid to Paiporta | 4,095.34 mi (6,590.81 km) |
| Euclid to Pajara | 3,827.23 mi (6,159.33 km) |
| Euclid to Palafolls | 4,158.85 mi (6,693.02 km) |
| Euclid to Palafrugell | 4,168.24 mi (6,708.13 km) |
| Euclid to Palamos | 4,169.28 mi (6,709.81 km) |
