The NCES School District Geographic Relationship Files (GRFs) are tables that identify complete spatial associations between geographically defined school districts and other types of geographic areas. The GRFs were constructed from the Census Bureau's Topologically Integrated Geographic Encoding and Referencing (TIGER) database and include associations between school districts and American Indian, Alaska Native, and Native Hawaiian areas (AIANNH), counties, Core Based Statistical Areas (CBSA), Consolidated Statistical Areas (CSA), New England City and Town Areas (NECTA), Zip Code Tabulation Areas (ZCTA), Urban Areas, Congressional Districts (CD), places, county subdivisions, Census tracts, and Census block groups.
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