This study sought to identify in a meaningful and standardized fashion the in-state and out-of-state students at the freshman, junior, and graduate levels for each of the 9 colleges in the state of Idaho. It further sought to ascertain for each college the main contributing areas or zones in the state for freshman and junior students and to establish some explanation concerning variations. Maps presented in this document were subsequently prepared to show the data in a graphic fashion and to note zones of overlap and degrees of institutional dominance. Results of the study are presented by individual institutions and then in the composite. (HS)