| Bucharest to Olympia Heights (Florida) | 5,735.17 mi (9,229.86 km) |
| Bucharest to Omaha (Nebraska) | 5,517.94 mi (8,880.27 km) |
| Bucharest to On Top of the World Designated Place (Florida) | 5,647.57 mi (9,088.89 km) |
| Bucharest to Onalaska (Wisconsin) | 5,221.37 mi (8,402.98 km) |
| Bucharest to Oneida (New York) | 4,710.44 mi (7,580.72 km) |
| Bucharest to Oneonta (New York) | 4,715.91 mi (7,589.53 km) |
| Bucharest to Ontario (California) | 6,555.60 mi (10,550.22 km) |
| Bucharest to Ontario (Oregon) | 5,917.02 mi (9,522.53 km) |
| Bucharest to Opa-locka (Florida) | 5,722.79 mi (9,209.94 km) |
| Bucharest to Opelika (Alabama) | 5,591.62 mi (8,998.84 km) |
| Bucharest to Opelousas (Louisiana) | 5,960.72 mi (9,592.86 km) |
| Bucharest to Orange (California) | 6,575.57 mi (10,582.36 km) |
| Bucharest to Orange (Texas) | 6,045.05 mi (9,728.57 km) |
| Bucharest to Orange City (Florida) | 5,614.71 mi (9,036.00 km) |
| Bucharest to Orangeburg (South Carolina) | 5,370.70 mi (8,643.31 km) |
