Some do and some don’t. Universities with a large number of Canadians are very aware of CEGEPs. You know if a university has a large number of Canadian applicants if they have an international admissions officer that only works with Canada (examples: NYU, Harvard, UPenn).
It is a great idea to reach out to a university and let them know that you are interested in more information about their programs. In that email, let the admissions officer know that you attend a CEGEP, and ask them if they need more information on what a CEGEP is. You can direct them to the
EducationUSA Canadian Education System page for more information or to your Guidance Counselor. It is suggested that your Guidance Counselor describes what a CEGEP is and how the grading system works in their letter of recommendation to the universities you are applying to.