| Gaithersburg to Dover (New Hampshire) | 432.01 mi (695.26 km) |
| Gaithersburg to Dover (New Jersey) | 185.35 mi (298.29 km) |
| Gaithersburg to Dover (Ohio) | 246.07 mi (396.02 km) |
| Gaithersburg to Downers Grove (Illinois) | 596.45 mi (959.89 km) |
| Gaithersburg to Downey (California) | 2,280.28 mi (3,669.76 km) |
| Gaithersburg to Dranesville (Virginia) | 12.75 mi (20.52 km) |
| Gaithersburg to Draper (Utah) | 1,829.36 mi (2,944.07 km) |
| Gaithersburg to Drexel Heights (Arizona) | 1,948.09 mi (3,135.15 km) |
| Gaithersburg to Drexel Hill (Pennsylvania) | 116.27 mi (187.12 km) |
| Gaithersburg to Duarte (California) | 2,265.11 mi (3,645.34 km) |
| Gaithersburg to Dublin (California) | 2,395.97 mi (3,855.94 km) |
| Gaithersburg to Dublin (Georgia) | 556.79 mi (896.07 km) |
| Gaithersburg to Dublin (Ohio) | 322.78 mi (519.46 km) |
| Gaithersburg to Dubuque (Iowa) | 741.95 mi (1,194.05 km) |
| Gaithersburg to Duluth (Georgia) | 522.89 mi (841.51 km) |
