Figure 5.21 is a U.S. map showing needing but not receiving treatment for illicit drug use in past year among persons aged 12 or older, by State: percentages, annual averages based on 2002 and 2003 NSDUHs. States listed here in alphabetical order within each group were divided into five groups based on the magnitude of their percentages. States in the highest group (2.91 to 3.50 percent) were Alaska, Arizona, Colorado, District of Columbia, Massachusetts, New Hampshire, New Mexico, Rhode Island, Vermont, and Washington. States in the next highest group (2.75 to 2.90 percent) were California, Connecticut, Florida, Idaho, Louisiana, Maine, Missouri, Montana, and Oregon. States in the mid group (2.61 to 2.74 percent) were Arkansas, Hawaii, Maryland, Nebraska, Nevada, New York, North Carolina, Ohio, Oklahoma, Utah, and Virginia. States in the next lowest group (2.47 to 2.60 percent) were Delaware, Georgia, Illinois, Indiana, Kentucky, Michigan, Minnesota, Mississippi, North Dakota, Tennessee, and Texas. States in the lowest group (2.20 to 2.46 percent) were Alabama, Iowa, Kansas, New Jersey, Pennsylvania, South Carolina, South Dakota, West Virginia, Wisconsin, and Wyoming.

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SAMHSA, an agency in the Department of Health and Human Services, is the Federal Government's lead agency for improving the quality and availability of substance abuse prevention, addiction treatment, and mental health services in the United States.