| San Marcos to Baraboo (Wisconsin) | 1,639.89 mi (2,639.15 km) |
| San Marcos to Barberton (Ohio) | 2,019.66 mi (3,250.32 km) |
| San Marcos to Bardstown (Kentucky) | 1,804.88 mi (2,904.68 km) |
| San Marcos to Barrington (Illinois) | 1,696.59 mi (2,730.40 km) |
| San Marcos to Barstow (California) | 119.83 mi (192.85 km) |
| San Marcos to Bartlesville (Oklahoma) | 1,225.21 mi (1,971.79 km) |
| San Marcos to Bartlett (Illinois) | 1,690.20 mi (2,720.12 km) |
| San Marcos to Bartlett (Tennessee) | 1,565.26 mi (2,519.05 km) |
| San Marcos to Bartow (Florida) | 2,125.22 mi (3,420.22 km) |
| San Marcos to Batavia (Illinois) | 1,683.14 mi (2,708.75 km) |
| San Marcos to Batavia (New York) | 2,205.56 mi (3,549.51 km) |
| San Marcos to Batesville (Arkansas) | 1,462.93 mi (2,354.36 km) |
| San Marcos to Baton Rouge (Louisiana) | 1,536.79 mi (2,473.23 km) |
| San Marcos to Battle Creek (Michigan) | 1,844.19 mi (2,967.93 km) |
| San Marcos to Battle Ground (Washington) | 918.62 mi (1,478.37 km) |
