| Gaithersburg to Decatur (Alabama) | 625.19 mi (1,006.15 km) |
| Gaithersburg to Decatur (Georgia) | 540.30 mi (869.53 km) |
| Gaithersburg to Decatur (Illinois) | 626.47 mi (1,008.21 km) |
| Gaithersburg to Deer Park (New York) | 234.77 mi (377.82 km) |
| Gaithersburg to Deer Park (Texas) | 1,207.78 mi (1,943.74 km) |
| Gaithersburg to Deerfield (Illinois) | 595.19 mi (957.86 km) |
| Gaithersburg to Deerfield Beach (Florida) | 902.34 mi (1,452.17 km) |
| Gaithersburg to Defiance (Ohio) | 405.36 mi (652.36 km) |
| Gaithersburg to DeForest (Wisconsin) | 690.46 mi (1,111.19 km) |
| Gaithersburg to DeKalb (Illinois) | 635.22 mi (1,022.29 km) |
| Gaithersburg to Del Aire (California) | 2,293.55 mi (3,691.10 km) |
| Gaithersburg to Del City (Oklahoma) | 1,138.08 mi (1,831.57 km) |
| Gaithersburg to Del Rio (Texas) | 1,504.35 mi (2,421.02 km) |
| Gaithersburg to DeLand (Florida) | 736.33 mi (1,185.00 km) |
| Gaithersburg to Delano (California) | 2,297.67 mi (3,697.75 km) |
