This study considers demographic, offense, and disorder contributors to exposure and posttraumatic stress disorder (PTSD) in a large (N = 9,611) dataset of standardized psychiatric assessments resulting from nationwide collaborations with justice agencies. Youths' antisocial history may elevate risk for traumatic exposure and PTSD, additionally, traumatic victimization increases risk for externalizing behavior. Rates of all types of traumatic exposure and PTSD were clearly elevated and expectably related to disorder and antisocial behavior.