| Merthyr Tudful to Curtea de Arges | 1,354.49 mi (2,179.84 km) |
| Merthyr Tudful to Dabuleni | 1,378.04 mi (2,217.75 km) |
| Merthyr Tudful to Darabani | 1,344.43 mi (2,163.65 km) |
| Merthyr Tudful to Darmanesti | 1,391.05 mi (2,238.69 km) |
| Merthyr Tudful to Dej | 1,255.43 mi (2,020.43 km) |
| Merthyr Tudful to Deva | 1,255.00 mi (2,019.72 km) |
| Merthyr Tudful to Dolhasca | 1,365.53 mi (2,197.61 km) |
| Merthyr Tudful to Dorohoi | 1,342.22 mi (2,160.09 km) |
| Merthyr Tudful to Draganesti-Olt | 1,382.65 mi (2,225.16 km) |
| Merthyr Tudful to Dragasani | 1,353.54 mi (2,178.31 km) |
| Merthyr Tudful to Drobeta-Turnu Severin | 1,286.94 mi (2,071.14 km) |
| Merthyr Tudful to Fagaras | 1,343.47 mi (2,162.11 km) |
| Merthyr Tudful to Falticeni | 1,351.48 mi (2,174.99 km) |
| Merthyr Tudful to Fetesti | 1,512.93 mi (2,434.83 km) |
| Merthyr Tudful to Filiasi | 1,331.86 mi (2,143.43 km) |
