From the 2019 TIGER/Line Technical Documentation: The Census Bureau obtains school district boundaries, names, local education agency codes, grade ranges, and school district levels annually from state education officials. The Census Bureau collects this information for the primary purpose of providing the U.S. Department of Education with annual estimates of the number of children aged 5 through 17 in families in poverty within each school district, county, and state. This information serves as the basis for the Department of Education to determine the annual allocation of Title I funding to states and school districts. The 2023 118th Congressional District TIGER/Line Shapefiles include separate shapefiles for elementary, secondary, and unified school districts. The 2020 shapefiles contain information from the 2020 school year (i.e., districts in operation as of January 1, 2020). Unified school districts provide education to children of all school ages. In general, if there is a unified school district, no elementary or secondary school district exists. If there is an elementary school district, the secondary school district may or may not exist. In addition to regular functioning school districts, the TIGER/Line Shapefiles contain pseudoschool districts.