This report uses data from the Treatment Episode Data Set (TEDS) to examine treatment admission data in 2015, and trend data from 2005 to 2015, nationally, regionally (by four Census regions and nine Census divisions), and by state or jurisdiction. The report provides information on the demographic and substance abuse characteristics of admissions to treatment aged 12 and older for abuse of alcohol and/or drugs in facilities that report to individual state administrative data systems. It is important to note that values in charts, narrative lists, and percentage distributions are calculated using actual raw numbers and rounded for presentation in this report; calculations using rounded values may produce different results. For 2015, a total of 1,537,025 admissions aged 12 and older were reported to TEDS by 45 states, the District of Columbia, and Puerto Rico (Georgia, Kansas, Oregon, Pennsylvania, and South Carolina did not report sufficient admissions for 2015 to be included in this report).