This report is modeled after the 1990 National Household Survey on Drug Abuse (NHSDA) to provide estimates of the prevalence of drug use in the DC metropolitan area. The report provides an overview of the prevalence of use of illicit drugs, alcohol, and tobacco for the DC MSA household population and for four age groups: youth (ages 12 to 17; young adults (ages 18-25); middle adults (ages 26-34); and older adults (ages 35 and older). Data are reported on the use of any illicit drugs as well as the specific drugs of marijuana; cocaine and crack; inhalants, hallucinogens, and heroin; and the nonmedical use of psychotherapeutic drugs. Data on alcohol and tobacco use are also reported. In addition to data on the prevalence of the use of these drugs, the report examines the demographic correlates of the use of illicit drugs, alcohol, and tobacco. Separate chapters provide information on problems associated with drug use, patterns of use of illicit drugs and alcohol, perceptions of the harmfulness of drug use, and opportunities to use drugs. Another chapter presents information on the drug use of special populations, such as women of childbearing age, groups of various educational status, and groups of various employment status. 21 tables, 29 figures, 7 references, and appended selected data tables, tables of standard efforts, suppression rule for prevalence estimates, and sampling and weighting procedures