This study examined the impact racial composition of prior environment (specifically, high school and neighborhood environments) has on reported racial microaggression occurrence among self-identified minority college students in the Midwest. Participating students completed the Racial Microaggression Scale, a survey instrument whose primary domain is intended to assess the frequency of occurrence for racial microaggressions. Findings indicated that racial composition of high school and neighborhood environments has a statistically significant effect on reported racial microaggression occurrence. Additionally, findings indicated that microaggression themes of criminality and undesirability are particularly related to the racial composition of prior environment, with students from a majority minority background reporting incidents of criminality and undesirability themed racial microaggressions more frequently than their peers. Implications will be included for professional school counselors working with these students at the high school level.