| Drobeta-Turnu Severin to Olympia Heights (Florida) | 5,578.86 mi (8,978.32 km) |
| Drobeta-Turnu Severin to Omaha (Nebraska) | 5,395.20 mi (8,682.74 km) |
| Drobeta-Turnu Severin to On Top of the World Designated Place (Florida) | 5,495.93 mi (8,844.84 km) |
| Drobeta-Turnu Severin to Onalaska (Wisconsin) | 5,096.47 mi (8,201.98 km) |
| Drobeta-Turnu Severin to Oneida (New York) | 4,569.01 mi (7,353.10 km) |
| Drobeta-Turnu Severin to Oneonta (New York) | 4,573.12 mi (7,359.73 km) |
| Drobeta-Turnu Severin to Ontario (California) | 6,456.65 mi (10,390.97 km) |
| Drobeta-Turnu Severin to Ontario (Oregon) | 5,827.97 mi (9,379.21 km) |
| Drobeta-Turnu Severin to Opa-locka (Florida) | 5,566.57 mi (8,958.53 km) |
| Drobeta-Turnu Severin to Opelika (Alabama) | 5,446.48 mi (8,765.26 km) |
| Drobeta-Turnu Severin to Opelousas (Louisiana) | 5,820.31 mi (9,366.88 km) |
| Drobeta-Turnu Severin to Orange (California) | 6,476.76 mi (10,423.33 km) |
| Drobeta-Turnu Severin to Orange (Texas) | 5,906.12 mi (9,504.98 km) |
| Drobeta-Turnu Severin to Orange City (Florida) | 5,462.04 mi (8,790.31 km) |
| Drobeta-Turnu Severin to Orangeburg (South Carolina) | 5,222.24 mi (8,404.38 km) |
