| Drobeta-Turnu Severin to Orangevale (California) | 6,255.92 mi (10,067.94 km) |
| Drobeta-Turnu Severin to Orchards (Washington) | 5,843.23 mi (9,403.76 km) |
| Drobeta-Turnu Severin to Orcutt (California) | 6,476.17 mi (10,422.39 km) |
| Drobeta-Turnu Severin to Oregon (Ohio) | 4,930.42 mi (7,934.74 km) |
| Drobeta-Turnu Severin to Oregon (Wisconsin) | 5,082.76 mi (8,179.91 km) |
| Drobeta-Turnu Severin to Oregon City (Oregon) | 5,866.35 mi (9,440.98 km) |
| Drobeta-Turnu Severin to Orem (Utah) | 5,921.21 mi (9,529.27 km) |
| Drobeta-Turnu Severin to Orinda (California) | 6,328.23 mi (10,184.31 km) |
| Drobeta-Turnu Severin to Orland Park (Illinois) | 5,094.61 mi (8,198.97 km) |
| Drobeta-Turnu Severin to Orlando (Florida) | 5,486.61 mi (8,829.84 km) |
| Drobeta-Turnu Severin to Ormond Beach (Florida) | 5,436.26 mi (8,748.82 km) |
| Drobeta-Turnu Severin to Oro Valley (Arizona) | 6,368.03 mi (10,248.35 km) |
| Drobeta-Turnu Severin to Oroville (California) | 6,212.64 mi (9,998.28 km) |
| Drobeta-Turnu Severin to Oshkosh (Wisconsin) | 4,999.31 mi (8,045.62 km) |
| Drobeta-Turnu Severin to Oskaloosa (Iowa) | 5,278.47 mi (8,494.87 km) |
