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National Center for Education Statistics -- Common Core of Data

The Common Core of Data (CCD), a program of the U.S. Department of Education's National Center for Education Statistics, is a comprehensive, annual, national statistical database of information concerning all public elementary and secondary schools (approximately 95,000) and school districts (approximately 17,000).
School District Demographics

From the National Center for Education Statistics, the School District Demographics website provides access to geographic and demographic data for school districts nationwide.