The No Child Left Behind Act has generated debate over issues including graduation levels; the ways states are implementing graduation rate accountability required under the law; and the best methods for measuring graduation rates. This study provides the most extensive set of systematic empirical findings to date on U.S. public school graduation rates. The findings include detailed descriptive statistics and analytic results for the nation as a whole, by geographical region, and for each of the states. The study also offers a detailed perspective on high school completion by examining graduation rates for the overall student population, for specific racial and ethnic groups, and by gender, and analysis of graduation rate patterns for particular types of school districts.