This report describes teacher and school characteristics related to teacher movement within and out of public school systems in Colorado, Missouri, and South Dakota. Stakeholders in each of these states expressed interest in better understanding teacher mobility and attrition and related factors. The authors used administrative data provided by state education agencies to examine the characteristics related to the likelihood that teachers would move to different schools or leave state public school systems from 2015/16 to 2016/17. Results suggest that the likelihood of teachers either moving or leaving was most strongly related to age, years of experience in their schools or districts, special education teaching assignments, average salaries, school demographics and performance, and school state accountability designation. Information about factors that contribute to moving and leaving may help decision-makers improve the policy and practices aimed at attracting and keeping teachers.