| San Marcos to Brown Deer (Wisconsin) | 1,720.01 mi (2,768.09 km) |
| San Marcos to Brownsburg (Indiana) | 1,762.39 mi (2,836.29 km) |
| San Marcos to Brownsville (Florida) | 2,265.91 mi (3,646.63 km) |
| San Marcos to Brownsville (Texas) | 1,280.69 mi (2,061.07 km) |
| San Marcos to Brownwood (Texas) | 1,064.51 mi (1,713.17 km) |
| San Marcos to Brunswick (Georgia) | 2,083.10 mi (3,352.42 km) |
| San Marcos to Brunswick (Ohio) | 2,009.68 mi (3,234.27 km) |
| San Marcos to Brushy Creek (Texas) | 1,153.57 mi (1,856.50 km) |
| San Marcos to Bryan (Texas) | 1,229.53 mi (1,978.73 km) |
| San Marcos to Bryant (Arkansas) | 1,416.10 mi (2,278.99 km) |
| San Marcos to Bryn Mawr-Skyway (Washington) | 1,026.87 mi (1,652.58 km) |
| San Marcos to Buckeye (Arizona) | 262.51 mi (422.47 km) |
| San Marcos to Buckhall (Virginia) | 2,238.09 mi (3,601.86 km) |
| San Marcos to Bucyrus (Ohio) | 1,947.34 mi (3,133.95 km) |
| San Marcos to Buda (Texas) | 1,154.94 mi (1,858.70 km) |
