| Gaithersburg to Darby (Pennsylvania) | 117.36 mi (188.88 km) |
| Gaithersburg to Dardenne Prairie (Missouri) | 726.26 mi (1,168.80 km) |
| Gaithersburg to Darien (Illinois) | 593.85 mi (955.70 km) |
| Gaithersburg to Davenport (Iowa) | 723.99 mi (1,165.15 km) |
| Gaithersburg to Davidson (North Carolina) | 320.89 mi (516.43 km) |
| Gaithersburg to Davie (Florida) | 919.46 mi (1,479.73 km) |
| Gaithersburg to Davis (California) | 2,371.74 mi (3,816.95 km) |
| Gaithersburg to Dayton (Nevada) | 2,246.54 mi (3,615.46 km) |
| Gaithersburg to Dayton (Ohio) | 375.31 mi (604.00 km) |
| Gaithersburg to Daytona Beach (Florida) | 721.28 mi (1,160.78 km) |
| Gaithersburg to De Pere (Wisconsin) | 667.91 mi (1,074.90 km) |
| Gaithersburg to De Witt (New York) | 275.51 mi (443.39 km) |
| Gaithersburg to Dearborn (Michigan) | 383.15 mi (616.62 km) |
| Gaithersburg to Dearborn Heights (Michigan) | 386.03 mi (621.26 km) |
| Gaithersburg to DeBary (Florida) | 746.28 mi (1,201.03 km) |
