This report presents results from the Mental Health Client-Level Data (MH-CLD) and Mental Health Treatment Episode Data Set (MH-TEDS) for individuals receiving mental health services from state mental health systems in 2017, as well as selected trends in data collected from such individuals between 2014 and 2017. The report provides information on mental health diagnoses, mental health treatment settings, and demographic and substance use characteristics of individuals in mental health treatment in facilities that reported to individual state administrative data systems. In the 2017 reporting period, 48 states and other jurisdictions submitted 5,835,429 records for individuals receiving mental health services. Alaska, American Samoa, the Federated States of Micronesia, Georgia, Guam, Kansas, Marshall Islands, New Hampshire, New Jersey, U.S. Virgin Islands, and West Virginia had submitted no data or incomplete data for the 2017 reporting period, as of July 1, 2018.