| Rockville to Dixon (California) | 2,382.15 mi (3,833.70 km) |
| Rockville to Dixon (Illinois) | 674.64 mi (1,085.73 km) |
| Rockville to Dobbs Ferry (New York) | 218.99 mi (352.43 km) |
| Rockville to Doctor Phillips (Florida) | 775.66 mi (1,248.30 km) |
| Rockville to Dodge City (Kansas) | 1,237.70 mi (1,991.88 km) |
| Rockville to Dolton (Illinois) | 576.81 mi (928.29 km) |
| Rockville to Donna (Texas) | 1,503.20 mi (2,419.17 km) |
| Rockville to Dorado (Puerto Rico) | 1,566.66 mi (2,521.29 km) |
| Rockville to Doral (Florida) | 935.37 mi (1,505.33 km) |
| Rockville to Doraville (Georgia) | 532.70 mi (857.29 km) |
| Rockville to Dothan (Alabama) | 714.47 mi (1,149.82 km) |
| Rockville to Douglas (Arizona) | 1,892.92 mi (3,046.36 km) |
| Rockville to Douglas (Georgia) | 613.96 mi (988.08 km) |
| Rockville to Douglasville (Georgia) | 558.76 mi (899.23 km) |
| Rockville to Dover (Delaware) | 87.81 mi (141.31 km) |
