| Harpenden to Desert Hot Springs (California) | 5,369.76 mi (8,641.80 km) |
| Harpenden to DeSoto (Texas) | 4,741.67 mi (7,630.98 km) |
| Harpenden to Destin (Florida) | 4,442.04 mi (7,148.78 km) |
| Harpenden to Destrehan (Louisiana) | 4,621.91 mi (7,438.25 km) |
| Harpenden to Detroit (Michigan) | 3,732.49 mi (6,006.87 km) |
| Harpenden to Diamond Bar (California) | 5,408.38 mi (8,703.95 km) |
| Harpenden to Diamond Springs (California) | 5,232.00 mi (8,420.10 km) |
| Harpenden to Dickinson (North Dakota) | 4,223.50 mi (6,797.07 km) |
| Harpenden to Dickinson (Texas) | 4,835.09 mi (7,781.33 km) |
| Harpenden to Dickson (Tennessee) | 4,196.78 mi (6,754.06 km) |
| Harpenden to Difficult Run (Virginia) | 3,661.59 mi (5,892.76 km) |
| Harpenden to Dinuba (California) | 5,312.12 mi (8,549.02 km) |
| Harpenden to Discovery Bay (California) | 5,299.98 mi (8,529.50 km) |
| Harpenden to Dix Hills (New York) | 3,414.23 mi (5,494.68 km) |
| Harpenden to Dixon (California) | 5,275.28 mi (8,489.74 km) |
