| Orbetello to Navodari | 881.73 mi (1,419.01 km) |
| Orbetello to Negresti-Oas | 702.18 mi (1,130.04 km) |
| Orbetello to Nehoiu | 776.62 mi (1,249.86 km) |
| Orbetello to Ocna Mures | 680.25 mi (1,094.76 km) |
| Orbetello to Odobesti | 817.94 mi (1,316.34 km) |
| Orbetello to Odorheiu Secuiesc | 744.23 mi (1,197.73 km) |
| Orbetello to Oltenita | 783.18 mi (1,260.40 km) |
| Orbetello to Onesti | 811.05 mi (1,305.26 km) |
| Orbetello to Oradea | 614.43 mi (988.83 km) |
| Orbetello to Orastie | 638.55 mi (1,027.65 km) |
| Orbetello to Oravita | 552.33 mi (888.88 km) |
| Orbetello to Orsova | 581.06 mi (935.12 km) |
| Orbetello to Otelu Rosu | 592.71 mi (953.88 km) |
| Orbetello to Otopeni | 757.72 mi (1,219.43 km) |
| Orbetello to Ovidiu | 878.96 mi (1,414.54 km) |
