| Harpenden to Dover (New Jersey) | 3,460.28 mi (5,568.78 km) |
| Harpenden to Dover (Ohio) | 3,753.07 mi (6,039.98 km) |
| Harpenden to Downers Grove (Illinois) | 3,947.69 mi (6,353.20 km) |
| Harpenden to Downey (California) | 5,421.99 mi (8,725.85 km) |
| Harpenden to Dranesville (Virginia) | 3,658.23 mi (5,887.36 km) |
| Harpenden to Draper (Utah) | 4,853.03 mi (7,810.20 km) |
| Harpenden to Drexel Heights (Arizona) | 5,286.40 mi (8,507.64 km) |
| Harpenden to Drexel Hill (Pennsylvania) | 3,531.65 mi (5,683.64 km) |
| Harpenden to Duarte (California) | 5,403.42 mi (8,695.97 km) |
| Harpenden to Dublin (California) | 5,319.82 mi (8,561.43 km) |
| Harpenden to Dublin (Georgia) | 4,190.70 mi (6,744.29 km) |
| Harpenden to Dublin (Ohio) | 3,837.88 mi (6,176.47 km) |
| Harpenden to Dubuque (Iowa) | 4,015.31 mi (6,462.02 km) |
| Harpenden to Duluth (Georgia) | 4,168.49 mi (6,708.53 km) |
| Harpenden to Duluth (Minnesota) | 3,867.41 mi (6,224.00 km) |
