A survey of more than six hundred American colleges found that more than half knowingly admit students who are in the United States illegally under at least some circumstances. 

The survey, conducted by American Association of Collegiate Registrars and Admissions Officers, found that 54 percent of the 613 schools responding knowingly admitted undocumented students, although some said they only did so if the student had graduated from an in-state high school or had certified their intention to seek legal status. Public community colleges were the most likely to admit students known to be undocumented, with 7o percent of those respondents saying they did so.

Just a heads-up: the link above leads to the website of the Chronicle of Higher Education, and the comments on that article are just as creepy as one would expect.