| Southborough to Bonita (California) | 5,508.81 mi (8,865.57 km) |
| Southborough to Bonita Springs (Florida) | 4,487.21 mi (7,221.47 km) |
| Southborough to Bonney Lake (Washington) | 4,833.77 mi (7,779.21 km) |
| Southborough to Boone (Iowa) | 4,199.85 mi (6,759.01 km) |
| Southborough to Boone (North Carolina) | 4,001.61 mi (6,439.98 km) |
| Southborough to Borger (Texas) | 4,798.48 mi (7,722.41 km) |
| Southborough to Bossier City (Louisiana) | 4,664.60 mi (7,506.94 km) |
| Southborough to Boston (Massachusetts) | 3,297.50 mi (5,306.81 km) |
| Southborough to Bostonia (California) | 5,497.37 mi (8,847.16 km) |
| Southborough to Bothell (Washington) | 4,800.77 mi (7,726.10 km) |
| Southborough to Bothell East (Washington) | 4,798.37 mi (7,722.23 km) |
| Southborough to Bothell West (Washington) | 4,799.88 mi (7,724.66 km) |
| Southborough to Boulder (Colorado) | 4,707.59 mi (7,576.13 km) |
| Southborough to Boulder City (Nevada) | 5,260.24 mi (8,465.54 km) |
| Southborough to Bound Brook (New Jersey) | 3,512.98 mi (5,653.60 km) |
