What are the 3 largest universities in Oklahoma?

The three largest universities in Oklahoma, by student enrollment, are generally considered to be:

1. Oklahoma State University (OSU): Located in Stillwater.

2. University of Oklahoma (OU): Located in Norman.

3. University of Central Oklahoma (UCO): Located in Edmond.

It's worth noting that rankings can fluctuate slightly depending on the source and the definition of "university" (some might include community colleges, which would change the list). But these three consistently appear at the top of any list of largest Oklahoma universities.