BRFSS is a state-based surveillance system. Each year, state health departments (with assistance from CDC) conduct random-digit–dialed, landline telephone surveys of the noninstitutionalized civilian population aged ≥18 years in all 50 states, the District of Columbia (DC), Puerto Rico, Guam, and the U.S. Virgin Islands.* Median response rates during 2006–2010 ranged from 50.6% to 54.6%. Since 2005, the core component of the survey has included a cardiovascular disease section, which includes one question related to stroke: “Has a doctor, nurse, or other health professional ever told you that you had stroke?” Participants who answered “yes” to this question were defined as having self-reported stroke. Participants were excluded if they answered “don't know” or refused to answer this question. Stroke prevalence was calculated based on the proportion of the population answering “yes.” Data on the following sociodemographic characteristics were obtained from BRFSS core questions and included in this analysis: age group (18–44 years, 45–64 years, and ≥65 years), sex, race/ethnicity (white, black, Hispanic, Asian or Native Hawaiian/Other Pacific Islander [Asian/NHOPI], and American Indian/Alaska Native),† level of education, and state of residence.