Harvard first, BYU second: Most popular schools in US

This actually makes sense. After all, when people apply to BYU, they are specifically looking for an LDS educational environment that only a few schools provide, and even though you have places like BYU-Idaho, SVU, or even the Utah public schools (I know some people from outside of Utah will go to a Utah state school just to move to Utah), BYU-Provo is still considered the gold standard for LDS higher education. Most students in America, I would say, either choose a school for low cost (so they go to their respective in-state school) or because they know what to study, so they choose a school that has a good program in that field. I don't think either one of those drivers draws a high percentage of any school's population like BYU's LDS environment and prestige among LDS schools draws its environment.