A single Individual campus with a single physical location of a four-year public university within the United States Enrollment is the sum of the headcount of undergraduate and graduate students Enrollment is counted by the 21st-day headcount, as provided to the United States Department of Education under the Common Data Set program.
Why Are These Colleges So Big? Most of the biggest colleges are public state universities. It makes sense that these schools attract the most students because they provide incentives for students who live in the state to attend. The largest schools are located in the most populous states.