| District Name | San Marcos Unified School District |
| State | California |
| County | San Diego County |
| Statistical Area | San Diego-Chula Vista-Carlsbad, CA |
| Total Students (2021) | 19743 |
| District Growth Rate (2017-21) | -5.7% |
| Majority Race/Ethnicty | Hispanic (46.0%) |
| Free/Reduced Lunch Program | 28.88% |