| Southborough to Barberton (Ohio) | 3,778.54 mi (6,080.97 km) |
| Southborough to Bardstown (Kentucky) | 4,078.75 mi (6,564.11 km) |
| Southborough to Barrington (Illinois) | 3,980.13 mi (6,405.41 km) |
| Southborough to Barstow (California) | 5,384.23 mi (8,665.08 km) |
| Southborough to Bartlesville (Oklahoma) | 4,539.44 mi (7,305.52 km) |
| Southborough to Bartlett (Illinois) | 3,991.07 mi (6,423.00 km) |
| Southborough to Bartlett (Tennessee) | 4,376.80 mi (7,043.77 km) |
| Southborough to Bartow (Florida) | 4,412.03 mi (7,100.47 km) |
| Southborough to Batavia (Illinois) | 4,001.17 mi (6,439.27 km) |
| Southborough to Batavia (New York) | 3,555.50 mi (5,722.03 km) |
| Southborough to Batesville (Arkansas) | 4,421.35 mi (7,115.47 km) |
| Southborough to Baton Rouge (Louisiana) | 4,669.01 mi (7,514.05 km) |
| Southborough to Battle Creek (Michigan) | 3,862.36 mi (6,215.87 km) |
| Southborough to Battle Ground (Washington) | 4,923.95 mi (7,924.33 km) |
| Southborough to Bay City (Michigan) | 3,752.87 mi (6,039.67 km) |
