The Segregation Index

The Segregation Index is now the Segregation Explorer. Follow our work at

Neighborhood and school segregation remain key barriers to social mobility and equal opportunity. To tackle these long-standing inequalities, we must have a clear understanding of patterns and trends in racial/ethnic and socioeconomic segregation.

The Segregation Index will be a comprehensive resource for tracking neighborhood and school segregation in the U.S., across every neighborhood and every school.

The SegIndex launched in May 2022 with new findings on school segregation. Additional data and resources are coming soon, including:

  • Longitudinal datasets on racial/ethnic and economic segregation between schools and neighborhoods at multiple levels of geography (e.g., national, metropolitan area, school district)
  • Research papers and briefs on key trends and findings
  • Methodological explainers on interpreting measures of segregation
  • Code for researchers to create customized segregation estimates





Trends in National Racial/Ethnic School Segregation, 1991 to 2020

Trends in National Economic School Segregation, 1991 to 2020

Share of National School Segregation Occurring Between School Districts, 1991 to 2020

Average Trends in Racial/Ethnic School Segregation in Large School Districts, 1991 to 2020

Average Trends in Economic School Segregation in Large School Districts, 1991 to 2020

School Racial Composition in the U.S.

National Trends in Racial Economic Segregation

Geographic Decomposition of Racial Economic Segregation

Average Within-District Trends ini Racial Economic Segregation, by District URM Enrollment



Related paper: Is Separate Still Unequal? New Evidence on School Segregation and Racial Academic Achievement Gaps



Access the Longitudinal School Demographic Dataset (LSDD):

The LSDD draws on the National Center for Education Statistics’ Common Core of Data to provide school-level race/ethnicity and free/reduced price lunch eligibility data from the 1991-92 to 2020-21 school years. The LSDD imputes missing and implausible data, improves school ID linkages, and links charter schools to geographic districts, among other data quality improvements.

LSDD Under Construction.

Data: School Segregation in U.S. Metro Areas

Read Related Report: School Segregation in U.S. Metro Areas; By Halley Potter, The Century Foundation

View Related Data Dashboard: School Segregation in Cities Across America Mapped


Coming Soon: School Segregation Database

The School Segregation Database will provide longitudinal estimates of segregation between schools and between districts for all states, metros, and districts in the US; among private schools, and between public and private schools; and among and between public traditional and charter sectors. We will estimate segregation with multiple indices for racial segregation, economic segregation, and racial economic segregation.



Ann Owens 
Professor of Sociology, Public Policy, and Spatial Sciences; Associate Director, Sol Price Center for Social Innovation, USC

sean f. reardon
Professor of Poverty and Inequality in Education, Professor (by courtesy) of Sociology, Stanford Graduate School of Education

Demetra Kalogrides
Research Associate, Stanford Center for Education Policy

Heewon Jang
Assistant Professor, University of Alabama

Thalia Tom
Ph.D. Candidate, USC Department of Sociology


Related Media

  • USCNews: New ‘Segregation Index’ shows U.S. schools remain highly separated by race, ethnicity and economic status
  • AirTalk on KPCC: American Schools, Including In LAUSD, Remain Highly Segregated According To New Index
  • KCBS Radio: New tool helps researchers evaluate segregation in United States schools
  • The 74: 68 Years After Brown, Schools Still ‘Highly’ Segregated: 4 Takeaways from Study
  • Chalkbeat Newark: Newark area has some of the country’s most segregated schools, study finds
  • Newsweek: School Segregation Still Common 68 Years After Brown v. Board: Report
  • The Century Foundation: School Segregation in U.S. Metro Areas
  • KNX-AM
  • Chalkbeat Philadelphia: Philadelphia area schools among the most segregated in the country
  • Education Week: An Expansive Look at School Segregation Shows It’s Getting Worse
  • The Miami Times: Where School Segregation Is Still Happening

This work has been supported (in part) by Grant # 1911-19449 from the Russell Sage Foundation. Any opinions expressed are those of the principal investigator(s) alone and should not be construed as representing the opinions of the Foundation.
For more information, email Ann Owens: [email protected].

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