| Barstow to Oswego (Illinois) | 1,618.34 mi (2,604.47 km) |
| Barstow to Oswego (New York) | 2,227.96 mi (3,585.56 km) |
| Barstow to Otsego (Minnesota) | 1,424.34 mi (2,292.25 km) |
| Barstow to Ottawa (Illinois) | 1,590.38 mi (2,559.47 km) |
| Barstow to Ottawa (Kansas) | 1,230.38 mi (1,980.11 km) |
| Barstow to Ottumwa (Iowa) | 1,402.21 mi (2,256.63 km) |
| Barstow to Overland (Missouri) | 1,494.37 mi (2,404.96 km) |
| Barstow to Overland Park (Kansas) | 1,263.23 mi (2,032.98 km) |
| Barstow to Overlea (Maryland) | 2,235.71 mi (3,598.03 km) |
| Barstow to Oviedo (Florida) | 2,138.06 mi (3,440.88 km) |
| Barstow to Owasso (Oklahoma) | 1,193.90 mi (1,921.39 km) |
| Barstow to Owatonna (Minnesota) | 1,414.00 mi (2,275.61 km) |
| Barstow to Owensboro (Kentucky) | 1,671.13 mi (2,689.43 km) |
| Barstow to Owings Mills (Maryland) | 2,220.87 mi (3,574.14 km) |
| Barstow to Owosso (Michigan) | 1,840.40 mi (2,961.83 km) |
