| Cities | Distance |
|---|---|
| Harpenden to Droylsden | 137.72 mi (221.63 km) |
| Harpenden to Dudley | 87.71 mi (141.15 km) |
| Harpenden to Dukinfield | 135.49 mi (218.05 km) |
| Harpenden to Dumbarton | 333.00 mi (535.91 km) |
| Harpenden to Dumfries | 261.46 mi (420.78 km) |
| Harpenden to Dunbar | 302.25 mi (486.43 km) |
| Harpenden to Dunblane | 335.40 mi (539.77 km) |
| Harpenden to Dundee | 337.89 mi (543.78 km) |
| Harpenden to Dunfermline | 319.55 mi (514.27 km) |
| Harpenden to Dunstable | 8.61 mi (13.86 km) |
| Harpenden to Durham | 210.54 mi (338.83 km) |
| Harpenden to Ealing | 20.85 mi (33.56 km) |
| Harpenden to Earlestown | 148.33 mi (238.71 km) |
| Harpenden to Earley | 36.41 mi (58.60 km) |
| Harpenden to East Barnet | 14.53 mi (23.38 km) |