| Heum to Navodari | 1,283.13 mi (2,065.00 km) |
| Heum to Negresti-Oas | 945.77 mi (1,522.06 km) |
| Heum to Nehoiu | 1,164.58 mi (1,874.21 km) |
| Heum to Ocna Mures | 1,045.14 mi (1,681.98 km) |
| Heum to Odobesti | 1,158.62 mi (1,864.62 km) |
| Heum to Odorheiu Secuiesc | 1,082.98 mi (1,742.89 km) |
| Heum to Oltenita | 1,249.08 mi (2,010.20 km) |
| Heum to Onesti | 1,122.19 mi (1,805.99 km) |
| Heum to Oradea | 961.50 mi (1,547.39 km) |
| Heum to Orastie | 1,064.07 mi (1,712.46 km) |
| Heum to Oravita | 1,085.03 mi (1,746.19 km) |
| Heum to Orsova | 1,118.56 mi (1,800.15 km) |
| Heum to Otelu Rosu | 1,067.49 mi (1,717.96 km) |
| Heum to Otopeni | 1,207.65 mi (1,943.53 km) |
| Heum to Ovidiu | 1,284.82 mi (2,067.72 km) |
