This study presents nationally representative data on the 12-month prevalence of DSM-IV alcohol abuse and dependence in the United States for the years 1991-1992 and 2001-2002. The prevalence of DSM-IV alcohol abuse was 4.65% in 2001-2002, with males and younger respondents being more affected. The prevalence of dependence was 3.81%, with Whites, Native Americans, and Hispanics having higher rates than Asians. Between 1991-1992 and 2001-2002, the prevalence of abuse increased while dependence declined. The study highlights the need for continued monitoring of prevalence and trends and the development of culturally sensitive prevention and intervention programs.This study presents nationally representative data on the 12-month prevalence of DSM-IV alcohol abuse and dependence in the United States for the years 1991-1992 and 2001-2002. The prevalence of DSM-IV alcohol abuse was 4.65% in 2001-2002, with males and younger respondents being more affected. The prevalence of dependence was 3.81%, with Whites, Native Americans, and Hispanics having higher rates than Asians. Between 1991-1992 and 2001-2002, the prevalence of abuse increased while dependence declined. The study highlights the need for continued monitoring of prevalence and trends and the development of culturally sensitive prevention and intervention programs.