| Barstow to Oakley (California) | 336.73 mi (541.91 km) |
| Barstow to Oakton (Virginia) | 2,196.80 mi (3,535.41 km) |
| Barstow to Oakville (Missouri) | 1,496.55 mi (2,408.47 km) |
| Barstow to Oatfield (Oregon) | 784.88 mi (1,263.14 km) |
| Barstow to Ocala (Florida) | 2,070.90 mi (3,332.79 km) |
| Barstow to Ocean Acres (New Jersey) | 2,351.97 mi (3,785.13 km) |
| Barstow to Ocean City (New Jersey) | 2,338.27 mi (3,763.08 km) |
| Barstow to Ocean Pines (Maryland) | 2,316.09 mi (3,727.39 km) |
| Barstow to Ocean Pointe (Hawaii) | 2,645.95 mi (4,258.25 km) |
| Barstow to Ocean Springs (Mississippi) | 1,667.17 mi (2,683.05 km) |
| Barstow to Oceanside (California) | 114.39 mi (184.09 km) |
| Barstow to Oceanside (New York) | 2,380.36 mi (3,830.83 km) |
| Barstow to Ocoee (Florida) | 2,120.39 mi (3,412.43 km) |
| Barstow to Oconomowoc (Wisconsin) | 1,625.96 mi (2,616.73 km) |
| Barstow to Odenton (Maryland) | 2,228.17 mi (3,585.89 km) |
