| Gaithersburg to Dixon (California) | 2,378.32 mi (3,827.53 km) |
| Gaithersburg to Dixon (Illinois) | 670.51 mi (1,079.08 km) |
| Gaithersburg to Dobbs Ferry (New York) | 219.26 mi (352.86 km) |
| Gaithersburg to Doctor Phillips (Florida) | 777.94 mi (1,251.97 km) |
| Gaithersburg to Dodge City (Kansas) | 1,234.42 mi (1,986.61 km) |
| Gaithersburg to Dolton (Illinois) | 572.65 mi (921.60 km) |
| Gaithersburg to Donna (Texas) | 1,502.32 mi (2,417.75 km) |
| Gaithersburg to Dorado (Puerto Rico) | 1,571.23 mi (2,528.65 km) |
| Gaithersburg to Doral (Florida) | 938.16 mi (1,509.83 km) |
| Gaithersburg to Doraville (Georgia) | 532.62 mi (857.17 km) |
| Gaithersburg to Dothan (Alabama) | 714.95 mi (1,150.60 km) |
| Gaithersburg to Douglas (Arizona) | 1,890.23 mi (3,042.04 km) |
| Gaithersburg to Douglas (Georgia) | 615.24 mi (990.14 km) |
| Gaithersburg to Douglasville (Georgia) | 558.60 mi (898.98 km) |
| Gaithersburg to Dover (Delaware) | 90.73 mi (146.01 km) |
