There is a growing demand for research linking specific educational services with positive student outcomes. Little empirical evidence exists to show that school nursing services improve student success. School attendance is one of many factors that has been associated with improved learning; school nurses can affect that factor. This study compared the number of students in a Midwest urban public school district who were dismissed from school early for illness or injury with and without interaction with a school nurse. A student sign-out and sign-in log identified the number of students who left school prior to the official dismissal time, and a school nurse activity log indicated the students who were dismissed early from school after contact with a school nurse. Analysis of these data indicates that 57% fewer students left school early with school nurse contact compared with those who left school early without such contact. The results of this study indicate school nurses may positively influence student school success by reducing avoidable early release from school for ill or injured students.