| Cities | Distance |
|---|---|
| Harpenden to Darlaston | 88.61 mi (142.60 km) |
| Harpenden to Darlington | 193.69 mi (311.71 km) |
| Harpenden to Dartford | 35.82 mi (57.65 km) |
| Harpenden to Darton | 131.73 mi (212.01 km) |
| Harpenden to Darwen | 157.01 mi (252.68 km) |
| Harpenden to Daventry | 45.95 mi (73.96 km) |
| Harpenden to Davyhulme | 141.27 mi (227.35 km) |
| Harpenden to Dawlish | 159.57 mi (256.81 km) |
| Harpenden to Deal | 85.84 mi (138.15 km) |
| Harpenden to Denby Dale | 132.93 mi (213.92 km) |
| Harpenden to Denton | 135.09 mi (217.41 km) |
| Harpenden to Derby | 89.83 mi (144.57 km) |
| Harpenden to Derry | 361.63 mi (581.99 km) |
| Harpenden to Desborough | 47.30 mi (76.12 km) |
| Harpenden to Devizes | 77.51 mi (124.75 km) |