Objective: Detentions and suspensions are common practices of school discipline, despite evidence that they are largely ineffective and disproportionately affect children from racial and ethnic minority backgrounds, particularly Black children, and children of lower socioeconomic status. However, few studies have examined suspension and detention rates among race, ethnicity, and family structure (single parent versus secondary caregiver) when controlling for typical behaviors associated with detention and suspension such as externalizing symptoms, age, sex, family income, family education, family conflict, and special education needs. Method: Caregivers of 11,875 children between ages 9 and 10 years from the Adolescent Brain Cognitive Development (ABCD) study completed a questionnaire assessing their child's demographics, family information, emotions and behaviors, and past-year school discipline history. Data were analyzed with logistic regression, implemented with a generalized estimating equations model. Results: 5.4% of children received a detention or suspension. Controlling for typical predictors of behaviors, Black and multiracial Black children had up to 3.5 times greater odds of receiving a detention or suspension than White children; there were no disciplinary differences for Hispanic or Asian children compared to White children. Children from single-parent households had 1.4 times the odds of receiving detentions or suspensions than children in homes with a secondary caregiver. Conclusion: Disciplinary actions that can impair typical childhood development, lead to academic failure and dropout, and cause significant emotional and psychological distress disproportionately affect Black children, multiracial Black children, and children from single-parent homes. Racism in elementary school discipline can perpetuate disparities in today's educational system.