| Southborough to Bel Air (Maryland) | 3,632.17 mi (5,845.41 km) |
| Southborough to Bel Air North (Maryland) | 3,632.42 mi (5,845.81 km) |
| Southborough to Bel Air South (Maryland) | 3,632.19 mi (5,845.44 km) |
| Southborough to Belgrade (Montana) | 4,596.51 mi (7,397.37 km) |
| Southborough to Bell (California) | 5,471.22 mi (8,805.08 km) |
| Southborough to Bell Gardens (California) | 5,471.21 mi (8,805.07 km) |
| Southborough to Bella Vista (Arkansas) | 4,489.15 mi (7,224.59 km) |
| Southborough to Bellair-Meadowbrook Terrace (Florida) | 4,294.91 mi (6,911.99 km) |
| Southborough to Bellaire (Texas) | 4,880.35 mi (7,854.17 km) |
| Southborough to Belle Chasse (Louisiana) | 4,653.05 mi (7,488.36 km) |
| Southborough to Belle Glade (Florida) | 4,422.75 mi (7,117.74 km) |
| Southborough to Bellefontaine (Ohio) | 3,893.26 mi (6,265.59 km) |
| Southborough to Bellefontaine Neighbors (Missouri) | 4,221.29 mi (6,793.51 km) |
| Southborough to Belleville (Illinois) | 4,223.49 mi (6,797.05 km) |
| Southborough to Bellevue (Nebraska) | 4,319.49 mi (6,951.55 km) |
