| Rockville to Bonham (Texas) | 1,122.81 mi (1,806.99 km) |
| Rockville to Bonita (California) | 2,257.44 mi (3,632.99 km) |
| Rockville to Bonita Springs (Florida) | 919.30 mi (1,479.46 km) |
| Rockville to Bonney Lake (Washington) | 2,303.71 mi (3,707.46 km) |
| Rockville to Boone (Iowa) | 899.72 mi (1,447.96 km) |
| Rockville to Boone (North Carolina) | 316.63 mi (509.57 km) |
| Rockville to Borger (Texas) | 1,348.00 mi (2,169.40 km) |
| Rockville to Bossier City (Louisiana) | 1,028.18 mi (1,654.70 km) |
| Rockville to Boston (Massachusetts) | 388.51 mi (625.25 km) |
| Rockville to Bostonia (California) | 2,248.96 mi (3,619.36 km) |
| Rockville to Bothell (Washington) | 2,303.68 mi (3,707.41 km) |
| Rockville to Bothell East (Washington) | 2,302.68 mi (3,705.81 km) |
| Rockville to Bothell West (Washington) | 2,305.27 mi (3,709.97 km) |
| Rockville to Boulder (Colorado) | 1,492.01 mi (2,401.16 km) |
| Rockville to Boulder City (Nevada) | 2,068.61 mi (3,329.11 km) |
