| Rio Maior to Navodari | 1,946.05 mi (3,131.87 km) |
| Rio Maior to Negresti-Oas | 1,708.04 mi (2,748.83 km) |
| Rio Maior to Nehoiu | 1,831.40 mi (2,947.36 km) |
| Rio Maior to Ocna Mures | 1,717.06 mi (2,763.34 km) |
| Rio Maior to Odobesti | 1,868.57 mi (3,007.18 km) |
| Rio Maior to Odorheiu Secuiesc | 1,785.30 mi (2,873.16 km) |
| Rio Maior to Oltenita | 1,849.00 mi (2,975.68 km) |
| Rio Maior to Onesti | 1,855.12 mi (2,985.52 km) |
| Rio Maior to Oradea | 1,630.86 mi (2,624.61 km) |
| Rio Maior to Orastie | 1,682.76 mi (2,708.14 km) |
| Rio Maior to Oravita | 1,605.90 mi (2,584.45 km) |
| Rio Maior to Orsova | 1,639.63 mi (2,638.73 km) |
| Rio Maior to Otelu Rosu | 1,640.39 mi (2,639.95 km) |
| Rio Maior to Otopeni | 1,820.11 mi (2,929.18 km) |
| Rio Maior to Ovidiu | 1,943.61 mi (3,127.94 km) |
