Providing access to high-quality medical care to patients with mental, behavioral and substance abuse disorders is one of the most important challenges in U.S. healthcare today. Helping individuals with mental illness requires a comprehensive strategy specific to the local challenges. As state policymakers assess new proposals to improve mental health treatment and access, understanding the population affected, the coverage gaps and the overall economic burden is integral to developing sustainable solutions that meet the need. The KSI has created several state-specific data chartbooks to quantify the magnitude of the challenges facing these states. In them, we present data from various sources to describe characteristics of the population with mental health disorders, the shortage of mental health providers, the impact on the healthcare system, and the implications for the criminal justice system. This project is a collaboration with BHECON, which aims to unite diverse stakeholders to identify, examine, and advance policy reforms to strengthen states’ mental health delivery systems.