This study uses a widely respected method to calculate public high school graduation rates for the nation, for each state, and for the 100 largest school districts in the United States. Graduation rates are calculated overall, by race, and by gender, using the most recent available data (the class of 2003). While this report builds upon a foundation of previous reports, there is much that is new. First, this report contains graduation rate estimates for the class of 2003, the most recent year for which data are available. Unfortunately, Common Core Data (CCD) enrollment and diploma counts are being released with greater time lags. However, since graduation rates tend not to change dramatically in short periods of time, this study provides a valuable snapshot of the performance of public schools today. Second, this report is able for the first time to break out graduation rates by gender. Observers have long suspected that the graduation rate for boys is significantly lower than that for girls. CCD now contains enough information to allow estimated graduation rates using the method for boys and girls separately. Third, this report contains graduation rates for each of the 100 largest school districts in the country. Previous rates for these districts were reported in a 2001 report, "High School Graduation Rates in the United States," with results for the class of 1998. The last few national report results for districts were not released. The district results in the 2001 report were based on enrollment and diploma information gathered from districts and states. After releasing that report, there were concerns about the reliability and consistency of those counts, so district graduation rates in subsequent national reports were not produced. For this report, reliability and consistency concerns have been addressed by relying only on district information gathered from CCD. Because of the uniform standards and procedures enforced by CCD, district results can once again be reported with a high level of confidence. It is important to note that no comparisons ought to be made between the district results for the class of 2003 and the previously reported district results for the class of 1998. Because those earlier results may not be reliable and were not computed using the same method as the current report, no conclusions should be drawn about any change in graduation rates for the districts. (Contains 14 endnotes and 5 tables.)