In the United States, there isn’t any official difference between a college and a university. There are no rules that require certain types of higher education institutions to use the term “college” and others to use “university.”
Many perceive the difference in terms of size, “university” means big and “college” means small. However, there are 467 institutions with “university” in their name that have 3,000 or less undergraduates with 109 having less than 1,000. There are some pretty big colleges out there as well. A total of 79 have 5,000 or more students, 163 have 3,000 or more.