| Walnut Creek to Olivares | 5,823.37 mi (9,371.81 km) |
| Walnut Creek to Olivenza | 5,725.17 mi (9,213.76 km) |
| Walnut Creek to Olot | 5,897.04 mi (9,490.37 km) |
| Walnut Creek to Onate | 5,685.80 mi (9,150.40 km) |
| Walnut Creek to Onda | 5,916.89 mi (9,522.32 km) |
| Walnut Creek to Onteniente | 5,962.77 mi (9,596.14 km) |
| Walnut Creek to Orihuela | 5,987.86 mi (9,636.53 km) |
| Walnut Creek to Osuna | 5,873.24 mi (9,452.07 km) |
| Walnut Creek to Ourense | 5,522.62 mi (8,887.81 km) |
| Walnut Creek to Oviedo | 5,548.00 mi (8,928.64 km) |
| Walnut Creek to Paiporta | 5,938.69 mi (9,557.39 km) |
| Walnut Creek to Pajara | 5,910.02 mi (9,511.26 km) |
| Walnut Creek to Palafolls | 5,932.70 mi (9,547.76 km) |
| Walnut Creek to Palafrugell | 5,933.41 mi (9,548.91 km) |
| Walnut Creek to Palamos | 5,936.05 mi (9,553.15 km) |
