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School segregation estimates draw on school-level enrollment data from the Longitudinal Imputed School Dataset (LISD) 1.0, created by the Segregation Tracking Project team. The LISD combines, cleans, and imputes missing and erroneous data from the National Center for Education Statistics Common Core of Data (CCD) since 1991. More information about the LISD is available at the Get the Data page.

Residential segregation estimates are derived from Census tract-level data on residents from the U.S. Census Bureau’s 1970 to 2020 decennial censuses and American Community Survey (ACS) five-year aggregate estimates from 2005-2009 through 2018-2022. The ACS trades annual frequency for smaller samples, so tract-level estimates require five-year aggregations.