OBJECTIVES:  To examine the correlates of marijuana use in the prior 12 months among US adults. METHODS:  Data from 2013-2014 National Surveys on Drug Use and Health, a cross-sectional nationally representative survey, identified 64,901 adults aged 21 and above. Outcome variable was self-reported marijuana use in the past year or not. Independent variables included sociodemographic factors, cigarette smoking, and other illicit drug use. Weighted, multivariate logistic regression models were constructed to examine the association between independent variables and marijuana use. RESULTS:  The prevalence of past-year marijuana use among respondents was approximately 12%. In the adjusted model, there was a dose response association between age and marital status and marijuana use. Respondents who were 35-49 years old (aOR = 1.37; 95% CI: 1.21 – 1.55) and 21–34 years old (aOR = 2.89; 95% CI: 2.57 – 3.26) were more likely to have used marijuana in the past year compared to those who were 50+ years as were widowed/divorced/separated (aOR = 1.27; 95% CI: 1.11 – 1.45) and never married (aOR = 2.14; 95% CI: 1.95 – 2.35) compared to married respondents. Past-year users were more likely to be male (aOR = 1.14; 95% CI: 1.04 – 1.24), and black (aOR = 1.32; 95% CI: 1.18 – 1.47) versus white. Past-year users, in addition to frequent marijuana use, also were more likely to smoke cigarettes within the past year and use other illicit drugs such as cocaine within the past year. CONCLUSIONS:  Younger adults, men, blacks, unmarried individuals and other substance users were more likely to use marijuana. Comprehensive screening, treatment for use of multiple substances, and additional research and patient education on the possible harms of marijuana use are needed. Particularly in the age of increasing policy changes, at the state level, around the legalization of marijuana, these findings may have important public health implications.