| Rockville to Bound Brook (New Jersey) | 172.61 mi (277.80 km) |
| Rockville to Bountiful (Utah) | 1,829.83 mi (2,944.83 km) |
| Rockville to Bourbonnais (Illinois) | 584.30 mi (940.34 km) |
| Rockville to Bowie (Maryland) | 23.97 mi (38.57 km) |
| Rockville to Bowling Green (Kentucky) | 525.58 mi (845.83 km) |
| Rockville to Bowling Green (Ohio) | 377.33 mi (607.25 km) |
| Rockville to Box Elder (South Dakota) | 1,377.60 mi (2,217.04 km) |
| Rockville to Boynton Beach (Florida) | 883.82 mi (1,422.37 km) |
| Rockville to Bozeman (Montana) | 1,774.69 mi (2,856.09 km) |
| Rockville to Bradenton (Florida) | 859.57 mi (1,383.34 km) |
| Rockville to Bradfordville (Florida) | 710.51 mi (1,143.45 km) |
| Rockville to Bradley (Illinois) | 582.36 mi (937.22 km) |
| Rockville to Bradley Gardens (New Jersey) | 167.28 mi (269.22 km) |
| Rockville to Brainerd (Minnesota) | 997.39 mi (1,605.14 km) |
| Rockville to Brambleton (Virginia) | 21.45 mi (34.52 km) |
