| Harpenden to Delhi (California) | 5,302.98 mi (8,534.33 km) |
| Harpenden to Delray Beach (Florida) | 4,376.03 mi (7,042.53 km) |
| Harpenden to Deltona (Florida) | 4,299.82 mi (6,919.89 km) |
| Harpenden to Deming (New Mexico) | 5,163.70 mi (8,310.18 km) |
| Harpenden to Denison (Texas) | 4,670.38 mi (7,516.25 km) |
| Harpenden to Dent (Ohio) | 3,940.23 mi (6,341.19 km) |
| Harpenden to Denton (Texas) | 4,720.24 mi (7,596.50 km) |
| Harpenden to Dentsville (South Carolina) | 4,034.91 mi (6,493.56 km) |
| Harpenden to Denver (Colorado) | 4,659.92 mi (7,499.41 km) |
| Harpenden to Depew (New York) | 3,537.56 mi (5,693.16 km) |
| Harpenden to Derby (Connecticut) | 3,381.30 mi (5,441.68 km) |
| Harpenden to Derby (Kansas) | 4,501.45 mi (7,244.38 km) |
| Harpenden to Des Moines (Iowa) | 4,167.00 mi (6,706.14 km) |
| Harpenden to Des Moines (Washington) | 4,773.29 mi (7,681.87 km) |
| Harpenden to Des Plaines (Illinois) | 3,932.09 mi (6,328.08 km) |
