| Barstow to Olivares | 5,762.52 mi (9,273.88 km) |
| Barstow to Olivenza | 5,667.03 mi (9,120.20 km) |
| Barstow to Olot | 5,884.91 mi (9,470.85 km) |
| Barstow to Onate | 5,661.69 mi (9,111.61 km) |
| Barstow to Onda | 5,886.31 mi (9,473.11 km) |
| Barstow to Onteniente | 5,926.17 mi (9,537.26 km) |
| Barstow to Orihuela | 5,946.98 mi (9,570.74 km) |
| Barstow to Osuna | 5,814.95 mi (9,358.27 km) |
| Barstow to Ourense | 5,478.95 mi (8,817.51 km) |
| Barstow to Oviedo | 5,515.01 mi (8,875.54 km) |
| Barstow to Paiporta | 5,905.31 mi (9,503.68 km) |
| Barstow to Pajara | 5,783.35 mi (9,307.41 km) |
| Barstow to Palafolls | 5,919.30 mi (9,526.20 km) |
| Barstow to Palafrugell | 5,922.41 mi (9,531.20 km) |
| Barstow to Palamos | 5,924.64 mi (9,534.78 km) |
