To get an answer, you need to specify which state college you're asking about. For example, you might ask:
* "How many students attend California State University, Fullerton?"
* "How many students attend Pennsylvania State University?"
* "How many students attend the University of North Carolina at Chapel Hill?" (While not explicitly called "state college," it's a public university funded by the state)
Once you specify the college, you can usually find the enrollment information on the college's official website.