| Southborough to Bailey's Crossroads (Virginia) | 3,694.88 mi (5,946.33 km) |
| Southborough to Bainbridge (Georgia) | 4,377.38 mi (7,044.71 km) |
| Southborough to Bainbridge Island (Washington) | 4,817.05 mi (7,752.29 km) |
| Southborough to Baker (Louisiana) | 4,662.94 mi (7,504.28 km) |
| Southborough to Bakersfield (California) | 5,419.86 mi (8,722.43 km) |
| Southborough to Balch Springs (Texas) | 4,769.82 mi (7,676.29 km) |
| Southborough to Baldwin (New York) | 3,471.20 mi (5,586.36 km) |
| Southborough to Baldwin (Pennsylvania) | 3,741.90 mi (6,022.00 km) |
| Southborough to Baldwin Park (California) | 5,458.67 mi (8,784.88 km) |
| Southborough to Ballenger Creek (Maryland) | 3,682.93 mi (5,927.11 km) |
| Southborough to Ballwin (Missouri) | 4,241.34 mi (6,825.77 km) |
| Southborough to Baltimore (Maryland) | 3,653.34 mi (5,879.48 km) |
| Southborough to Bangor (Maine) | 3,103.45 mi (4,994.52 km) |
| Southborough to Banning (California) | 5,431.68 mi (8,741.45 km) |
| Southborough to Baraboo (Wisconsin) | 3,979.74 mi (6,404.77 km) |
