| Rockville to Dallas (Oregon) | 2,371.29 mi (3,816.23 km) |
| Rockville to Dallas (Texas) | 1,176.98 mi (1,894.16 km) |
| Rockville to Dalton (Georgia) | 524.33 mi (843.83 km) |
| Rockville to Daly City (California) | 2,430.32 mi (3,911.22 km) |
| Rockville to Damascus (Maryland) | 13.08 mi (21.05 km) |
| Rockville to Damascus (Oregon) | 2,325.47 mi (3,742.48 km) |
| Rockville to Dana Point (California) | 2,272.06 mi (3,656.52 km) |
| Rockville to Danbury (Connecticut) | 251.77 mi (405.19 km) |
| Rockville to Dania Beach (Florida) | 916.61 mi (1,475.14 km) |
| Rockville to Danville (California) | 2,401.73 mi (3,865.20 km) |
| Rockville to Danville (Illinois) | 560.99 mi (902.83 km) |
| Rockville to Danville (Indiana) | 500.82 mi (805.99 km) |
| Rockville to Danville (Kentucky) | 424.65 mi (683.41 km) |
| Rockville to Danville (Virginia) | 212.04 mi (341.24 km) |
| Rockville to Daphne (Alabama) | 842.20 mi (1,355.38 km) |
