| Harpenden to Dallas (Texas) | 4,727.88 mi (7,608.79 km) |
| Harpenden to Dalton (Georgia) | 4,164.44 mi (6,702.02 km) |
| Harpenden to Daly City (California) | 5,338.41 mi (8,591.35 km) |
| Harpenden to Damascus (Maryland) | 3,638.78 mi (5,856.05 km) |
| Harpenden to Damascus (Oregon) | 4,889.54 mi (7,868.95 km) |
| Harpenden to Dana Point (California) | 5,434.64 mi (8,746.21 km) |
| Harpenden to Danbury (Connecticut) | 3,393.81 mi (5,461.81 km) |
| Harpenden to Dania Beach (Florida) | 4,399.16 mi (7,079.77 km) |
| Harpenden to Danville (California) | 5,316.41 mi (8,555.94 km) |
| Harpenden to Danville (Illinois) | 4,010.03 mi (6,453.52 km) |
| Harpenden to Danville (Indiana) | 3,985.39 mi (6,413.86 km) |
| Harpenden to Danville (Kentucky) | 4,018.20 mi (6,466.66 km) |
| Harpenden to Danville (Virginia) | 3,852.41 mi (6,199.86 km) |
| Harpenden to Daphne (Alabama) | 4,487.77 mi (7,222.37 km) |
| Harpenden to Darby (Pennsylvania) | 3,531.17 mi (5,682.87 km) |
