| Rockville to Bixby (Oklahoma) | 1,046.71 mi (1,684.52 km) |
| Rockville to Black Forest (Colorado) | 1,470.48 mi (2,366.51 km) |
| Rockville to Blackfoot (Idaho) | 1,839.19 mi (2,959.90 km) |
| Rockville to Blackhawk (California) | 2,398.37 mi (3,859.80 km) |
| Rockville to Blacksburg (Virginia) | 219.09 mi (352.59 km) |
| Rockville to Blackwells Mills (New Jersey) | 166.48 mi (267.92 km) |
| Rockville to Blaine (Minnesota) | 921.57 mi (1,483.13 km) |
| Rockville to Bloomingdale (Florida) | 827.85 mi (1,332.30 km) |
| Rockville to Bloomingdale (Illinois) | 606.99 mi (976.85 km) |
| Rockville to Bloomington (California) | 2,241.56 mi (3,607.44 km) |
| Rockville to Bloomington (Illinois) | 634.20 mi (1,020.65 km) |
| Rockville to Bloomington (Indiana) | 502.08 mi (808.01 km) |
| Rockville to Bloomington (Minnesota) | 918.18 mi (1,477.67 km) |
| Rockville to Bloomsburg (Pennsylvania) | 137.67 mi (221.56 km) |
| Rockville to Blue Ash (Ohio) | 387.23 mi (623.19 km) |
