This report presents national data about the prevalence of behavioral health conditions. This data includes the rate of serious mental illness, suicidal thoughts, substance use, and underage drinking. The report also highlights the percentages of those who seek treatment for these conditions. The state-level Barometers contain valuable insight into the behavioral health needs and the unique challenges faced by communities across the country. This analysis can help public health authorities and others determine the best ways of meeting behavioral health care needs and disparities among various communities.