List of United States university campuses by undergraduate enrollment

This list of largest United States universities by undergraduate enrollment includes only individual four-year campuses, not four-year universities. Universities can have multiple campuses with a single administration.

What this list includes:
 * 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 students
 * Enrollment is counted by the 21st-day headcount, as provided to the United States Department of Education under the Common Data Set program.
 * Campuses that have small secondary physical locations that are not reported separately (for extended education, outreach, etc.) are indicated with a footnote.

What this list does not include:
 * University systems, or universities that have multiple physical campuses.

For other lists that measure university enrollment, see the see also section below.