| Castel San Giorgio to Navodari | 748.03 mi (1,203.84 km) |
| Castel San Giorgio to Negresti-Oas | 651.59 mi (1,048.63 km) |
| Castel San Giorgio to Nehoiu | 664.54 mi (1,069.47 km) |
| Castel San Giorgio to Ocna Mures | 599.49 mi (964.78 km) |
| Castel San Giorgio to Odobesti | 709.91 mi (1,142.49 km) |
| Castel San Giorgio to Odorheiu Secuiesc | 653.22 mi (1,051.26 km) |
| Castel San Giorgio to Oltenita | 649.34 mi (1,045.01 km) |
| Castel San Giorgio to Onesti | 712.10 mi (1,146.01 km) |
| Castel San Giorgio to Oradea | 563.35 mi (906.62 km) |
| Castel San Giorgio to Orastie | 551.85 mi (888.12 km) |
| Castel San Giorgio to Oravita | 459.55 mi (739.57 km) |
| Castel San Giorgio to Orsova | 475.72 mi (765.60 km) |
| Castel San Giorgio to Otelu Rosu | 505.41 mi (813.38 km) |
| Castel San Giorgio to Otopeni | 632.84 mi (1,018.45 km) |
| Castel San Giorgio to Ovidiu | 744.62 mi (1,198.34 km) |
