| Rockville to Brown Deer (Wisconsin) | 629.38 mi (1,012.88 km) |
| Rockville to Brownsburg (Indiana) | 494.76 mi (796.23 km) |
| Rockville to Brownsville (Florida) | 933.63 mi (1,502.53 km) |
| Rockville to Brownsville (Texas) | 1,482.60 mi (2,386.01 km) |
| Rockville to Brownwood (Texas) | 1,326.04 mi (2,134.06 km) |
| Rockville to Brunswick (Georgia) | 600.17 mi (965.87 km) |
| Rockville to Brunswick (Ohio) | 288.02 mi (463.53 km) |
| Rockville to Brushy Creek (Texas) | 1,305.17 mi (2,100.46 km) |
| Rockville to Bryan (Texas) | 1,231.68 mi (1,982.19 km) |
| Rockville to Bryant (Arkansas) | 900.98 mi (1,449.98 km) |
| Rockville to Bryn Mawr-Skyway (Washington) | 2,306.08 mi (3,711.27 km) |
| Rockville to Buckeye (Arizona) | 2,002.20 mi (3,222.23 km) |
| Rockville to Buckhall (Virginia) | 29.39 mi (47.30 km) |
| Rockville to Bucyrus (Ohio) | 330.20 mi (531.41 km) |
| Rockville to Buda (Texas) | 1,327.13 mi (2,135.81 km) |
