| Rockville to Des Plaines (Illinois) | 599.27 mi (964.43 km) |
| Rockville to Desert Hot Springs (California) | 2,198.19 mi (3,537.64 km) |
| Rockville to DeSoto (Texas) | 1,188.15 mi (1,912.14 km) |
| Rockville to Destin (Florida) | 799.10 mi (1,286.03 km) |
| Rockville to Destrehan (Louisiana) | 979.35 mi (1,576.10 km) |
| Rockville to Detroit (Michigan) | 385.76 mi (620.82 km) |
| Rockville to Diamond Bar (California) | 2,265.25 mi (3,645.57 km) |
| Rockville to Diamond Springs (California) | 2,326.32 mi (3,743.85 km) |
| Rockville to Dickinson (North Dakota) | 1,395.54 mi (2,245.91 km) |
| Rockville to Dickinson (Texas) | 1,216.15 mi (1,957.20 km) |
| Rockville to Dickson (Tennessee) | 596.41 mi (959.83 km) |
| Rockville to Difficult Run (Virginia) | 16.24 mi (26.14 km) |
| Rockville to Dinuba (California) | 2,291.73 mi (3,688.18 km) |
| Rockville to Discovery Bay (California) | 2,380.48 mi (3,831.02 km) |
| Rockville to Dix Hills (New York) | 234.53 mi (377.45 km) |
