The "Principal Retention Patterns in Arizona, Nevada, and Utah" study examined principal retention rates in Arizona, Nevada, and Utah. The study sought to understand principal retention patterns in these states, so that their new statewide leadership support initiatives could identify areas where support could be most effective. Principal retention patterns varied by state according to grade span, school locale type, and student demographic characteristics. In addition, across the three states, proportionally fewer principals remained at schools with lower average proficiency rates on standardized tests in math and English language arts than at schools with higher average proficiency rates from fall 2016 to fall 2019 (three year retention). This document presents the following three appendixes that accompany the study: (1) Data and methods; (2) Detailed results for principal mobility; and (3) County-level retention rates by state. [For the full report, see ED617164. For the Study Snapshot, see ED617165.]