| San Marcos to Buena Park (California) | 69.13 mi (111.25 km) |
| San Marcos to Buenaventura Lakes (Florida) | 2,142.54 mi (3,448.09 km) |
| San Marcos to Buffalo (Minnesota) | 1,492.08 mi (2,401.27 km) |
| San Marcos to Buffalo (New York) | 2,171.30 mi (3,494.37 km) |
| San Marcos to Buffalo Grove (Illinois) | 1,705.17 mi (2,744.20 km) |
| San Marcos to Buford (Georgia) | 1,901.91 mi (3,060.83 km) |
| San Marcos to Bull Run (Virginia) | 2,234.00 mi (3,595.28 km) |
| San Marcos to Bullhead City (Arizona) | 203.49 mi (327.49 km) |
| San Marcos to Burbank (California) | 98.28 mi (158.17 km) |
| San Marcos to Burbank (Illinois) | 1,709.17 mi (2,750.65 km) |
| San Marcos to Burien (Washington) | 1,026.97 mi (1,652.75 km) |
| San Marcos to Burkburnett (Texas) | 1,071.26 mi (1,724.02 km) |
| San Marcos to Burke (Virginia) | 2,247.85 mi (3,617.56 km) |
| San Marcos to Burke Centre (Virginia) | 2,245.84 mi (3,614.33 km) |
| San Marcos to Burleson (Texas) | 1,150.99 mi (1,852.34 km) |
