| Rockville to Decatur (Alabama) | 626.34 mi (1,008.00 km) |
| Rockville to Decatur (Georgia) | 540.33 mi (869.57 km) |
| Rockville to Decatur (Illinois) | 630.06 mi (1,013.98 km) |
| Rockville to Deer Park (New York) | 233.89 mi (376.40 km) |
| Rockville to Deer Park (Texas) | 1,208.93 mi (1,945.58 km) |
| Rockville to Deerfield (Illinois) | 599.46 mi (964.74 km) |
| Rockville to Deerfield Beach (Florida) | 899.50 mi (1,447.61 km) |
| Rockville to Defiance (Ohio) | 409.63 mi (659.23 km) |
| Rockville to DeForest (Wisconsin) | 694.87 mi (1,118.28 km) |
| Rockville to DeKalb (Illinois) | 639.40 mi (1,029.01 km) |
| Rockville to Del Aire (California) | 2,296.89 mi (3,696.48 km) |
| Rockville to Del City (Oklahoma) | 1,140.76 mi (1,835.88 km) |
| Rockville to Del Rio (Texas) | 1,506.10 mi (2,423.84 km) |
| Rockville to DeLand (Florida) | 734.05 mi (1,181.34 km) |
| Rockville to Delano (California) | 2,301.22 mi (3,703.45 km) |
