| Herndon to Dover (New Hampshire) | 446.57 mi (718.69 km) |
| Herndon to Dover (New Jersey) | 199.88 mi (321.68 km) |
| Herndon to Dover (Ohio) | 242.70 mi (390.59 km) |
| Herndon to Downers Grove (Illinois) | 592.07 mi (952.85 km) |
| Herndon to Downey (California) | 2,271.79 mi (3,656.09 km) |
| Herndon to Dranesville (Virginia) | 2.00 mi (3.22 km) |
| Herndon to Draper (Utah) | 1,823.14 mi (2,934.06 km) |
| Herndon to Drexel Heights (Arizona) | 1,938.06 mi (3,119.01 km) |
| Herndon to Drexel Hill (Pennsylvania) | 130.10 mi (209.37 km) |
| Herndon to Duarte (California) | 2,256.67 mi (3,631.76 km) |
| Herndon to Dublin (California) | 2,389.27 mi (3,845.17 km) |
| Herndon to Dublin (Georgia) | 542.10 mi (872.43 km) |
| Herndon to Dublin (Ohio) | 316.75 mi (509.75 km) |
| Herndon to Dubuque (Iowa) | 737.83 mi (1,187.43 km) |
| Herndon to Duluth (Georgia) | 508.42 mi (818.22 km) |
