While it is a limited data set, my kid’s fairly well known Chicagoland public high school had substantially higher than average admissions to Carleton, Macalester, Grinnell, Denison, Kenyon, St Olaf’s, Depauw, Laurence, and Knox. Acceptance rates to these colleges was a lot higher than acceptance rates of students from the high school to almost all non-Midwestern LACs with similar average acceptance rates. In fact, acceptance rates to similar non-midwestern LACs was generally lower than the average of those colleges (sometimes much lower), though it’s difficult to actually say much, since so few apply to LACs outside of the Midwest (very few had more than 1-3 applications each year).
So I can say that, at least for my kid’s high school, there is a strong geographic component in both application rates and acceptance rates to LACs.
PS. For some reason few kids from the high school apply to Oberlin.