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The most popular California State University, San Marcos undergraduate major is Business Administration and Management, General. Psychology, General and Registered Nursing/Registered Nurse are other popular majors.
| Business Administration and Management, General | 531 |
| Psychology, General | 323 |
| Registered Nursing/Registered Nurse | 318 |
| Criminology | 263 |
| Sociology | 258 |
| Biology/Biological Sciences, General | 195 |
| Human Development and Family Studies, General | 192 |
| Liberal Arts and Sciences/Liberal Studies | 174 |
| Speech Communication and Rhetoric | 166 |
| Computer Science | 126 |
| Health and Physical Education/Fitness, General | 126 |
| Early Childhood Education and Teaching | 114 |
| Visual and Performing Arts, General | 74 |
| Speech-Language Pathology/Pathologist | 71 |
| History, General | 69 |
| Political Science and Government, General | 61 |
| English Language and Literature, General | 56 |
| Environmental Studies | 48 |
| Economics, General | 42 |
| Mass Communication/Media Studies | 37 |
| Biochemistry | 35 |
| Biotechnology | 32 |
| Computer Software Engineering | 32 |
| Social Sciences, General | 29 |
| Sociology | 25 |
| Anthropology | 22 |
| Mathematics, General | 22 |
| Fire Protection, Other | 21 |
| Spanish Language and Literature | 19 |
| International/Global Studies | 14 |
| Physics, Other | 13 |
| Criminology | 10 |
| Chemistry, General | 9 |
| Music, General | 5 |
| Early Childhood Education and Teaching | 4 |
| Political Science and Government, General | 4 |
| Spanish Language and Literature | 4 |
| Drama and Dramatics/Theatre Arts, General | 3 |
| Women’s Studies | 3 |
| American Indian/Native American Studies | 2 |
| Environmental Studies | 2 |
| Psychology, General | 2 |
| Visual and Performing Arts, General | 2 |
| American Indian/Native American Studies | 1 |
| Anthropology | 1 |
| Biology/Biological Sciences, General | 1 |
| Business Administration and Management, General | 1 |
| Computer Science | 1 |
| Economics, General | 1 |
| International/Global Studies | 1 |
| Social Sciences, General | 1 |
| Speech Communication and Rhetoric | 1 |
The data on this website is sourced as public domain data from the most recent survey year of the National Center for Education Statistics’ College Navigator tool. That tool can be found at this link: https://nces.ed.gov/collegenavigator/. MyCollegeSelection encourages students to explore multiple resources as part of the research process in selecting the college of their dreams.