| Frederikssund to Navodari | 1,076.67 mi (1,732.73 km) |
| Frederikssund to Negresti-Oas | 731.47 mi (1,177.19 km) |
| Frederikssund to Nehoiu | 952.49 mi (1,532.89 km) |
| Frederikssund to Ocna Mures | 826.76 mi (1,330.53 km) |
| Frederikssund to Odobesti | 951.46 mi (1,531.23 km) |
| Frederikssund to Odorheiu Secuiesc | 870.40 mi (1,400.77 km) |
| Frederikssund to Oltenita | 1,033.97 mi (1,664.01 km) |
| Frederikssund to Onesti | 915.90 mi (1,474.00 km) |
| Frederikssund to Oradea | 737.68 mi (1,187.18 km) |
| Frederikssund to Orastie | 841.43 mi (1,354.15 km) |
| Frederikssund to Oravita | 855.67 mi (1,377.07 km) |
| Frederikssund to Orsova | 890.63 mi (1,433.34 km) |
| Frederikssund to Otelu Rosu | 841.08 mi (1,353.59 km) |
| Frederikssund to Otopeni | 991.84 mi (1,596.21 km) |
| Frederikssund to Ovidiu | 1,077.94 mi (1,734.78 km) |
