Does the number of students attending a school affect student achievement? This question guided the study. Therefore, one purpose of this study was to determine if a relationship existed between the total high school population (net enrollment) and outcomes defined in terms of test scores of Georgias Public High Schools. Another purpose was, assuming a statistical, Correlational relationship, was to focus on determining the statistical effect of student population size on student outcomes. Achievement was measured by scores from the Scholastic Aptitude Reasoning Test (SAT) and Georgia High School Graduation Test (GHSGT) data from standardized tests in English, Mathematics, Science, Social Studies, and Writing for the 2008-2009 school year. The 303 usable data sets were coded for statistical analysis using Statistical Package for Social Sciences (SPSS) software. Comparisons among school population and academic achievement measures were made through Pearsons r, multiple regression, and regression reduction. Alpha was set at the .05 level. Based upon the findings of this study, school size played no importance in the measures of academic achievement. Supporters of both large and small schools can equally say that in Georgia, size has little to no impact on academic achievement or graduation rates.