| San Marcos to Ashtabula (Ohio) | 2,065.97 mi (3,324.85 km) |
| San Marcos to Ashwaubenon (Wisconsin) | 1,738.44 mi (2,797.76 km) |
| San Marcos to Aspen Hill (Maryland) | 2,256.66 mi (3,631.74 km) |
| San Marcos to Astoria (Oregon) | 967.35 mi (1,556.81 km) |
| San Marcos to Atascadero (California) | 257.79 mi (414.88 km) |
| San Marcos to Atascocita (Texas) | 1,309.79 mi (2,107.90 km) |
| San Marcos to Atchison (Kansas) | 1,300.20 mi (2,092.47 km) |
| San Marcos to Athens (Alabama) | 1,729.32 mi (2,783.07 km) |
| San Marcos to Athens (Georgia) | 1,938.72 mi (3,120.07 km) |
| San Marcos to Athens (Ohio) | 1,988.05 mi (3,199.45 km) |
| San Marcos to Athens (Tennessee) | 1,857.62 mi (2,989.55 km) |
| San Marcos to Athens (Texas) | 1,240.84 mi (1,996.95 km) |
| San Marcos to Atlanta (Georgia) | 1,880.66 mi (3,026.64 km) |
| San Marcos to Atlantic Beach (Florida) | 2,100.20 mi (3,379.94 km) |
| San Marcos to Atlantic City (New Jersey) | 2,396.31 mi (3,856.49 km) |
