| Radford to Olympia (Washington) | 2,245.91 mi (3,614.44 km) |
| Radford to Olympia Heights (Florida) | 787.69 mi (1,267.67 km) |
| Radford to Omaha (Nebraska) | 876.15 mi (1,410.02 km) |
| Radford to On Top of the World Designated Place (Florida) | 562.85 mi (905.82 km) |
| Radford to Onalaska (Wisconsin) | 727.96 mi (1,171.54 km) |
| Radford to Oneida (New York) | 485.80 mi (781.82 km) |
| Radford to Oneonta (New York) | 469.62 mi (755.77 km) |
| Radford to Ontario (California) | 2,079.52 mi (3,346.67 km) |
| Radford to Ontario (Oregon) | 1,952.71 mi (3,142.59 km) |
| Radford to Opa-locka (Florida) | 775.65 mi (1,248.29 km) |
| Radford to Opelika (Alabama) | 411.69 mi (662.55 km) |
| Radford to Opelousas (Louisiana) | 802.29 mi (1,291.16 km) |
| Radford to Orange (California) | 2,096.06 mi (3,373.29 km) |
| Radford to Orange (Texas) | 899.12 mi (1,447.00 km) |
| Radford to Orange City (Florida) | 567.31 mi (913.00 km) |
