| San Marcos to Sumter (South Carolina) | 2,107.56 mi (3,391.79 km) |
| San Marcos to Sun City (Arizona) | 284.21 mi (457.39 km) |
| San Marcos to Sun City Center (Florida) | 2,098.07 mi (3,376.52 km) |
| San Marcos to Sun City West (Arizona) | 280.27 mi (451.04 km) |
| San Marcos to Sun Lakes (Arizona) | 306.80 mi (493.75 km) |
| San Marcos to Sun Prairie (Wisconsin) | 1,658.68 mi (2,669.38 km) |
| San Marcos to Sun Valley (Nevada) | 470.19 mi (756.70 km) |
| San Marcos to Sun Village (California) | 108.16 mi (174.07 km) |
| San Marcos to Sunland Park (New Mexico) | 622.97 mi (1,002.57 km) |
| San Marcos to Sunny Isles Beach (Florida) | 2,269.70 mi (3,652.73 km) |
| San Marcos to Sunnyside (Washington) | 922.88 mi (1,485.23 km) |
| San Marcos to Sunnyvale (California) | 401.22 mi (645.71 km) |
| San Marcos to Sunrise (Florida) | 2,254.13 mi (3,627.67 km) |
| San Marcos to Sunrise Manor (Nevada) | 242.49 mi (390.24 km) |
| San Marcos to Sunset (Florida) | 2,262.45 mi (3,641.06 km) |
