| Oak Ridge to Olympia Heights (Florida) | 745.19 mi (1,199.26 km) |
| Oak Ridge to Omaha (Nebraska) | 731.90 mi (1,177.88 km) |
| Oak Ridge to On Top of the World Designated Place (Florida) | 488.02 mi (785.40 km) |
| Oak Ridge to Onalaska (Wisconsin) | 658.21 mi (1,059.29 km) |
| Oak Ridge to Oneida (New York) | 672.45 mi (1,082.21 km) |
| Oak Ridge to Oneonta (New York) | 666.47 mi (1,072.58 km) |
| Oak Ridge to Ontario (California) | 1,880.95 mi (3,027.09 km) |
| Oak Ridge to Ontario (Oregon) | 1,803.78 mi (2,902.90 km) |
| Oak Ridge to Opa-locka (Florida) | 735.20 mi (1,183.19 km) |
| Oak Ridge to Opelika (Alabama) | 236.41 mi (380.47 km) |
| Oak Ridge to Opelousas (Louisiana) | 585.91 mi (942.92 km) |
| Oak Ridge to Orange (California) | 1,896.84 mi (3,052.67 km) |
| Oak Ridge to Orange (Texas) | 680.24 mi (1,094.75 km) |
| Oak Ridge to Orange City (Florida) | 516.23 mi (830.79 km) |
| Oak Ridge to Orangeburg (South Carolina) | 258.84 mi (416.56 km) |
