| Harpenden to Deville-les-Rouen | 173.45 mi (279.14 km) |
| Harpenden to Dieppe | 145.22 mi (233.70 km) |
| Harpenden to Digne-les-Bains | 614.08 mi (988.27 km) |
| Harpenden to Dijon | 392.96 mi (632.40 km) |
| Harpenden to Dinan | 244.13 mi (392.90 km) |
| Harpenden to Dinard | 232.65 mi (374.42 km) |
| Harpenden to Divonne-les-Bains | 477.87 mi (769.06 km) |
| Harpenden to Dole | 418.56 mi (673.60 km) |
| Harpenden to Dombasle-sur-Meurthe | 369.13 mi (594.06 km) |
| Harpenden to Domerat | 398.96 mi (642.06 km) |
| Harpenden to Domont | 225.95 mi (363.63 km) |
| Harpenden to Douai | 179.32 mi (288.59 km) |
| Harpenden to Douarnenez | 312.18 mi (502.40 km) |
| Harpenden to Douchy-les-Mines | 193.44 mi (311.30 km) |
| Harpenden to Dourdan | 250.10 mi (402.49 km) |
