| Harpenden to Dumas (Texas) | 4,762.01 mi (7,663.72 km) |
| Harpenden to Dumont (New Jersey) | 3,434.69 mi (5,527.60 km) |
| Harpenden to Duncan (Oklahoma) | 4,681.24 mi (7,533.72 km) |
| Harpenden to Duncanville (Texas) | 4,741.14 mi (7,630.12 km) |
| Harpenden to Dundalk (Maryland) | 3,610.32 mi (5,810.25 km) |
| Harpenden to Dunedin (Florida) | 4,409.19 mi (7,095.91 km) |
| Harpenden to Dunkirk (New York) | 3,581.14 mi (5,763.28 km) |
| Harpenden to Dunmore (Pennsylvania) | 3,479.50 mi (5,599.71 km) |
| Harpenden to Dunwoody (Georgia) | 4,178.19 mi (6,724.15 km) |
| Harpenden to Durango (Colorado) | 4,896.21 mi (7,879.68 km) |
| Harpenden to Durant (Oklahoma) | 4,651.44 mi (7,485.77 km) |
| Harpenden to Durham (North Carolina) | 3,860.11 mi (6,212.24 km) |
| Harpenden to Dyer (Indiana) | 3,942.31 mi (6,344.53 km) |
| Harpenden to Dyersburg (Tennessee) | 4,276.73 mi (6,882.73 km) |
| Harpenden to Eagan (Minnesota) | 3,995.20 mi (6,429.66 km) |
