| San Marcos to Bonham (Texas) | 1,209.29 mi (1,946.16 km) |
| San Marcos to Bonita (California) | 33.53 mi (53.97 km) |
| San Marcos to Bonita Springs (Florida) | 2,163.23 mi (3,481.38 km) |
| San Marcos to Bonney Lake (Washington) | 1,005.02 mi (1,617.42 km) |
| San Marcos to Boone (Iowa) | 1,410.27 mi (2,269.61 km) |
| San Marcos to Boone (North Carolina) | 2,017.56 mi (3,246.95 km) |
| San Marcos to Borger (Texas) | 914.95 mi (1,472.47 km) |
| San Marcos to Bossier City (Louisiana) | 1,362.61 mi (2,192.92 km) |
| San Marcos to Boston (Massachusetts) | 2,564.37 mi (4,126.96 km) |
| San Marcos to Bostonia (California) | 25.48 mi (41.00 km) |
| San Marcos to Bothell (Washington) | 1,044.83 mi (1,681.50 km) |
| San Marcos to Bothell East (Washington) | 1,046.76 mi (1,684.59 km) |
| San Marcos to Bothell West (Washington) | 1,047.43 mi (1,685.67 km) |
| San Marcos to Boulder (Colorado) | 813.75 mi (1,309.61 km) |
| San Marcos to Boulder City (Nevada) | 226.58 mi (364.65 km) |
