How much does academic performance vary among school districts and communities in the U.S.? How much of that variation is due to the socioeconomic context of the schools and the socioeconomic background of the students? How do test scores vary by race within and between districts? This short report uses new data from the Stanford Education Data Archive to investigate these questions. It is a working draft that will be updated in the next few weeks. The intended purpose is to highlight key patterns of academic achievement across the country; in future papers I will add additional more detailed analyses.