| San Marcos to Bound Brook (New Jersey) | 2,388.40 mi (3,843.76 km) |
| San Marcos to Bountiful (Utah) | 609.29 mi (980.56 km) |
| San Marcos to Bourbonnais (Illinois) | 1,696.73 mi (2,730.62 km) |
| San Marcos to Bowie (Maryland) | 2,275.39 mi (3,661.89 km) |
| San Marcos to Bowling Green (Kentucky) | 1,750.86 mi (2,817.73 km) |
| San Marcos to Bowling Green (Ohio) | 1,916.02 mi (3,083.54 km) |
| San Marcos to Box Elder (South Dakota) | 1,071.26 mi (1,724.03 km) |
| San Marcos to Boynton Beach (Florida) | 2,257.54 mi (3,633.16 km) |
| San Marcos to Bozeman (Montana) | 925.77 mi (1,489.88 km) |
| San Marcos to Bradenton (Florida) | 2,090.51 mi (3,364.35 km) |
| San Marcos to Bradfordville (Florida) | 1,935.01 mi (3,114.09 km) |
| San Marcos to Bradley (Illinois) | 1,698.21 mi (2,733.01 km) |
| San Marcos to Bradley Gardens (New Jersey) | 2,381.60 mi (3,832.82 km) |
| San Marcos to Brainerd (Minnesota) | 1,515.14 mi (2,438.38 km) |
| San Marcos to Brambleton (Virginia) | 2,232.83 mi (3,593.39 km) |
