| Gaithersburg to Duluth (Minnesota) | 918.64 mi (1,478.41 km) |
| Gaithersburg to Dumas (Texas) | 1,371.10 mi (2,206.56 km) |
| Gaithersburg to Dumont (New Jersey) | 211.34 mi (340.13 km) |
| Gaithersburg to Duncan (Oklahoma) | 1,185.33 mi (1,907.61 km) |
| Gaithersburg to Duncanville (Texas) | 1,187.19 mi (1,910.60 km) |
| Gaithersburg to Dundalk (Maryland) | 39.62 mi (63.76 km) |
| Gaithersburg to Dunedin (Florida) | 830.96 mi (1,337.31 km) |
| Gaithersburg to Dunkirk (New York) | 256.33 mi (412.52 km) |
| Gaithersburg to Dunmore (Pennsylvania) | 178.87 mi (287.86 km) |
| Gaithersburg to Dunwoody (Georgia) | 532.62 mi (857.18 km) |
| Gaithersburg to Durango (Colorado) | 1,662.11 mi (2,674.91 km) |
| Gaithersburg to Durant (Oklahoma) | 1,119.44 mi (1,801.56 km) |
| Gaithersburg to Durham (North Carolina) | 236.82 mi (381.13 km) |
| Gaithersburg to Dyer (Indiana) | 566.05 mi (910.96 km) |
| Gaithersburg to Dyersburg (Tennessee) | 698.68 mi (1,124.42 km) |
