To determine differences in the prevalence of suicide by sex, race/ethnicity, age, and geographic region in the United States, CDC analyzed 1999--2007 data from the Web-based Injury Statistics Query and Reporting System --- Fatal (WISQARS Fatal) and the National Vital Statistics System (NVSS). Mortality data originate from NVSS, which collects death certificate data filed in the 50 states and the District of Columbia. Data in this report were based on suicides from any cause and include the 1999--2007 data years. The WISQARS database contains mortality data based on NVSS and population counts for all U.S. counties based on U.S. Census data. Counts and rates of death can be obtained by underlying cause of death, mechanism of injury, state, county, age, race, sex, year, injury cause of death (e.g., firearm, poisoning, or suffocation) and by manner of death (e.g., suicide, homicide, or unintentional injury).