Our study draws on Andersen’s Model of health service utilization [20] to determine the influence of predisposing factors (e.g., socio-demographic and clinical characteristics), enabling factors (e.g., health insurance, financial resources to seek treatment), and need factors (e.g., type of substance disorder), on alcohol use treatment utilization. The study further builds on two previous studies of treatment seeking and barriers to treatment among NESARC participants with alcohol disorders [21, 22]; and extends the findings from these studies by comparing service settings and providers accessed, perceived unmet need for treatment and barriers to treatment in participants with and without comorbid mood or anxiety disorders.