5% of the students at California State University-San Marcos are registered with the college's disability services office.
| In-state | Out of state | |
| Cost of Attendance | $24,653 | $36,533 |
| Tuition | $7,727 | $19,607 |
| Room & Board (on-campus) | $13,150 | $13,150 |
| Books & Supplies | $1,118 | $1,118 |
| Transportation & Other | $2,658 | $2,658 |
| Percentage of students receiving some need-based aid | 77% | |
| Percentage of students receiving some Federal aid | 48% | |
| Percentage of students receiving some institutional aid | 41% | |
| Percentage of students with education loans | 37% |
California State University-San Marcos's Admissions Page
In 2020, the average GPA of students admitted to California State University-San Marcos was 3.18.
In 2020, 94% of applicants submitted SAT scores. Reported score ranges for admitted students:
| Score | Math | EBRW |
| 25th Percentile | 470 | 480 |
| 75th Percentile | 560 | 570 |
In 2020, 25% of applicants submitted ACT scores. Reported score ranges for admitted students:
| Score | Composite | Writing |
| 25th Percentile | 17 | - |
| 75th Percentile | 22 | - |
| Registered Nursing/Registered Nurse |
| Business Administration and Management, General |
| Human Development and Family Studies, General |
| Psychology, General |
| Criminology |
| Registered Nursing/Registered Nurse |
| Psychology, General |
| Biology/Biological Sciences, General |
| Computer Science |
| Environmental Studies |
| Criminology |
| Speech Communication and Rhetoric |
| Sociology, General |
| Liberal Arts and Sciences/Liberal Studies |
| History, General |