| Demir Hisar to Navodari | 432.35 mi (695.81 km) |
| Demir Hisar to Negresti-Oas | 472.16 mi (759.87 km) |
| Demir Hisar to Nehoiu | 383.71 mi (617.53 km) |
| Demir Hisar to Ocna Mures | 380.88 mi (612.96 km) |
| Demir Hisar to Odobesti | 429.92 mi (691.89 km) |
| Demir Hisar to Odorheiu Secuiesc | 406.87 mi (654.79 km) |
| Demir Hisar to Oltenita | 339.65 mi (546.62 km) |
| Demir Hisar to Onesti | 445.14 mi (716.38 km) |
| Demir Hisar to Oradea | 405.85 mi (653.15 km) |
| Demir Hisar to Orastie | 335.09 mi (539.28 km) |
| Demir Hisar to Oravita | 265.02 mi (426.51 km) |
| Demir Hisar to Orsova | 249.53 mi (401.58 km) |
| Demir Hisar to Otelu Rosu | 302.50 mi (486.83 km) |
| Demir Hisar to Otopeni | 336.96 mi (542.28 km) |
| Demir Hisar to Ovidiu | 428.40 mi (689.45 km) |
