| Harpenden to Curtea de Arges | 1,228.18 mi (1,976.57 km) |
| Harpenden to Dabuleni | 1,254.15 mi (2,018.35 km) |
| Harpenden to Darabani | 1,215.10 mi (1,955.51 km) |
| Harpenden to Darmanesti | 1,262.71 mi (2,032.14 km) |
| Harpenden to Dej | 1,127.25 mi (1,814.13 km) |
| Harpenden to Deva | 1,128.65 mi (1,816.38 km) |
| Harpenden to Dolhasca | 1,236.48 mi (1,989.92 km) |
| Harpenden to Dorohoi | 1,212.97 mi (1,952.09 km) |
| Harpenden to Draganesti-Olt | 1,257.83 mi (2,024.29 km) |
| Harpenden to Dragasani | 1,228.16 mi (1,976.54 km) |
| Harpenden to Drobeta-Turnu Severin | 1,162.78 mi (1,871.32 km) |
| Harpenden to Fagaras | 1,216.16 mi (1,957.21 km) |
| Harpenden to Falticeni | 1,222.46 mi (1,967.35 km) |
| Harpenden to Fetesti | 1,385.92 mi (2,230.41 km) |
| Harpenden to Filiasi | 1,207.42 mi (1,943.16 km) |
