| Oak Ridge to Oswego (Illinois) | 451.02 mi (725.84 km) |
| Oak Ridge to Oswego (New York) | 662.11 mi (1,065.57 km) |
| Oak Ridge to Otsego (Minnesota) | 806.50 mi (1,297.93 km) |
| Oak Ridge to Ottawa (Illinois) | 445.45 mi (716.89 km) |
| Oak Ridge to Ottawa (Kansas) | 629.50 mi (1,013.08 km) |
| Oak Ridge to Ottumwa (Iowa) | 560.88 mi (902.65 km) |
| Oak Ridge to Overland (Missouri) | 383.34 mi (616.93 km) |
| Oak Ridge to Overland Park (Kansas) | 604.55 mi (972.93 km) |
| Oak Ridge to Overlea (Maryland) | 485.64 mi (781.56 km) |
| Oak Ridge to Oviedo (Florida) | 536.30 mi (863.10 km) |
| Oak Ridge to Owasso (Oklahoma) | 643.89 mi (1,036.23 km) |
| Oak Ridge to Owatonna (Minnesota) | 733.19 mi (1,179.95 km) |
| Oak Ridge to Owensboro (Kentucky) | 199.28 mi (320.71 km) |
| Oak Ridge to Owings Mills (Maryland) | 474.12 mi (763.02 km) |
| Oak Ridge to Owosso (Michigan) | 485.88 mi (781.94 km) |
