This report updates and expands the 2013 surveillance report on mental health among children (8). Similar to the 2013 report, this report provides an overview of nine federal surveillance systems that collect data related to children’s mental health in the United States and the most recent estimates (2013–2019) available from these systems, including estimates according to selected sociodemographic characteristics linked to social determinants of health, such as age, sex, race and ethnicity, economic resources, parent education, access to health insurance, and geographic classification.