| Barstow to Orangevale (California) | 350.75 mi (564.48 km) |
| Barstow to Orchards (Washington) | 801.20 mi (1,289.41 km) |
| Barstow to Orcutt (California) | 191.32 mi (307.91 km) |
| Barstow to Oregon (Ohio) | 1,870.15 mi (3,009.71 km) |
| Barstow to Oregon (Wisconsin) | 1,579.30 mi (2,541.64 km) |
| Barstow to Oregon City (Oregon) | 780.38 mi (1,255.90 km) |
| Barstow to Orem (Utah) | 475.81 mi (765.75 km) |
| Barstow to Orinda (California) | 353.31 mi (568.59 km) |
| Barstow to Orland Park (Illinois) | 1,642.04 mi (2,642.60 km) |
| Barstow to Orlando (Florida) | 2,134.04 mi (3,434.41 km) |
| Barstow to Ormond Beach (Florida) | 2,127.56 mi (3,423.98 km) |
| Barstow to Oro Valley (Arizona) | 387.80 mi (624.10 km) |
| Barstow to Oroville (California) | 405.23 mi (652.15 km) |
| Barstow to Oshkosh (Wisconsin) | 1,635.83 mi (2,632.61 km) |
| Barstow to Oskaloosa (Iowa) | 1,394.16 mi (2,243.69 km) |
