This report compares state-level mental health prevalence estimates generated from the 2008 to 2014 National Surveys on Drug Use and Health (NSDUHs) with estimates of similar measures from the 2006 to 2013 Behavioral Risk Factor Surveillance System (BRFSS). It also describes the methodologies of these two surveys, such as survey mode and questionnaire design, and discusses how methodological differences may have contributed to differences in estimates.