| Harpenden to Delitzsch | 543.65 mi (874.92 km) |
| Harpenden to Delmenhorst | 387.64 mi (623.85 km) |
| Harpenden to Demmin | 576.17 mi (927.25 km) |
| Harpenden to Denkendorf | 478.01 mi (769.29 km) |
| Harpenden to Denzlingen | 448.10 mi (721.15 km) |
| Harpenden to Dessau-Rosslau | 536.79 mi (863.88 km) |
| Harpenden to Detmold | 393.77 mi (633.70 km) |
| Harpenden to Dettingen an der Erms | 485.08 mi (780.65 km) |
| Harpenden to Dieburg | 422.31 mi (679.64 km) |
| Harpenden to Diedorf | 547.33 mi (880.85 km) |
| Harpenden to Dielheim | 435.31 mi (700.56 km) |
| Harpenden to Diepholz | 373.09 mi (600.43 km) |
| Harpenden to Diessen am Ammersee | 574.75 mi (924.97 km) |
| Harpenden to Dietzenbach | 416.61 mi (670.48 km) |
| Harpenden to Diez | 376.39 mi (605.74 km) |
