The NCES Composite School District Boundaries combine the boundaries of three of the U.S. Census Bureau's Topologically Integrated Geographic Encoding and Referencing (TIGER) school district layers (Elementary, Secondary, and Unified) into a single file. This simplifies the task of linking school district boundaries with other types of school district data by eliminating the need to join data to multiple boundary files. It also simplifies district-level mapping by providing wall-to-wall school district geographic coverage for all U.S. territory in a single file. This school district boundary file was developed from geographic shapefiles created by the U.S. Census Bureau and made available for download by the U.S. Department of Education's National Center for Education Statistics (NCES) through its Education Demographic and Geographic Estimates (EDGE) program.
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