| Barstow to Odessa (Texas) | 872.15 mi (1,403.59 km) |
| Barstow to Ogden (Utah) | 518.98 mi (835.21 km) |
| Barstow to Oildale (California) | 118.62 mi (190.90 km) |
| Barstow to Ojus (Florida) | 2,268.50 mi (3,650.80 km) |
| Barstow to Okemos (Michigan) | 1,826.19 mi (2,938.98 km) |
| Barstow to Oklahoma City (Oklahoma) | 1,102.28 mi (1,773.95 km) |
| Barstow to Okmulgee (Oklahoma) | 1,186.20 mi (1,909.01 km) |
| Barstow to Olathe (Kansas) | 1,256.09 mi (2,021.48 km) |
| Barstow to Old Jamestown (Missouri) | 1,499.26 mi (2,412.83 km) |
| Barstow to Oldsmar (Florida) | 2,069.37 mi (3,330.33 km) |
| Barstow to Olean (New York) | 2,128.26 mi (3,425.10 km) |
| Barstow to Olive Branch (Mississippi) | 1,536.30 mi (2,472.44 km) |
| Barstow to Olivehurst (California) | 382.92 mi (616.25 km) |
| Barstow to Olney (Maryland) | 2,207.50 mi (3,552.62 km) |
| Barstow to Olympia (Washington) | 894.24 mi (1,439.15 km) |
