| San Marcos to San Luis (Arizona) | 149.91 mi (241.26 km) |
| San Marcos to San Luis Obispo (California) | 248.12 mi (399.31 km) |
| San Marcos to San Marcos (Texas) | 1,153.76 mi (1,856.80 km) |
| San Marcos to San Marino (California) | 87.02 mi (140.04 km) |
| San Marcos to San Mateo (California) | 420.56 mi (676.82 km) |
| San Marcos to San Pablo (California) | 442.20 mi (711.65 km) |
| San Marcos to San Rafael (California) | 450.26 mi (724.63 km) |
| San Marcos to San Ramon (California) | 417.08 mi (671.23 km) |
| San Marcos to San Tan Valley (Arizona) | 324.56 mi (522.32 km) |
| San Marcos to Sand Springs (Oklahoma) | 1,211.78 mi (1,950.18 km) |
| San Marcos to Sandusky (Ohio) | 1,965.33 mi (3,162.90 km) |
| San Marcos to Sandy (Oregon) | 889.61 mi (1,431.70 km) |
| San Marcos to Sandy (Utah) | 591.81 mi (952.43 km) |
| San Marcos to Sandy Springs (Georgia) | 1,881.98 mi (3,028.76 km) |
| San Marcos to Sanford (Florida) | 2,137.58 mi (3,440.10 km) |
