Statista: Rutgers-restricted database of statistical data from over 80,000 topics including education, politics, and society.
Kids Count Data Center: Data about child well-being in the United States. Search by keyword, browse by topic, or select a region to see available research.
National Center for Education Statistics (NCES): The "primary federal entity for collecting and analyzing data related to education in the U.S. and other nations." Search by keyword or browse publications.