| Effingham to Olivares | 4,304.45 mi (6,927.34 km) |
| Effingham to Olivenza | 4,216.50 mi (6,785.79 km) |
| Effingham to Olot | 4,531.91 mi (7,293.40 km) |
| Effingham to Onate | 4,286.75 mi (6,898.85 km) |
| Effingham to Onda | 4,489.27 mi (7,224.79 km) |
| Effingham to Onteniente | 4,514.54 mi (7,265.45 km) |
| Effingham to Orihuela | 4,525.48 mi (7,283.05 km) |
| Effingham to Osuna | 4,360.76 mi (7,017.96 km) |
| Effingham to Ourense | 4,064.03 mi (6,540.43 km) |
| Effingham to Oviedo | 4,123.55 mi (6,636.22 km) |
| Effingham to Paiporta | 4,501.40 mi (7,244.31 km) |
| Effingham to Pajara | 4,224.51 mi (6,798.69 km) |
| Effingham to Palafolls | 4,561.99 mi (7,341.82 km) |
| Effingham to Palafrugell | 4,570.94 mi (7,356.22 km) |
| Effingham to Palamos | 4,572.07 mi (7,358.04 km) |
