Child Opportunity Index 3.0 database, 2020 census tracts

The data available on this page is for 2020 census tracts, i.e., census tracts as defined for the 2020 Decennial Census. For 2010 census tract data, please follow this link.

The Child Opportunity Index (COI) 3.0 is a composite index of neighborhood features that help children thrive. COI 3.0 was first released in March 2024 and is updated annually. It builds on COI 2.0, which was released in 2020. For an overview of new features in COI 3.0 and a comparison to COI 2.0, please see What's New in COI 3.0. We recommend that all new users and new projects use COI 3.0.

COI 3.0 is based on 44 component indicators spanning 3 domains (education, health and environment, and social and economic) and 14 subdomains. Data is available for virtually all U.S. census tracts from 2012 to 2021.

More information on the COI is available on our COI overview page, including the COI 3.0 technical document. If you are looking for COI 3.0 data for ZIP codes or counties, please contact us.

Using the links below, you can download COI 3.0 data for the overall index, its three domains and 14 subdomains, as well as child population counts by race/ethnicity. Please note before downloading: The overall index and subdomain files are several hundred megabytes large.

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Suggested citation: 2024. “Child Opportunity Index 3.0 database, 2020 census tracts”, retrieved from on May 19 2024.

Additional Info

Last Updated April 11, 2024
Year(s) Data available from 2012 to 2021.

The COI is compiled from many sources. Please refer to the technical document for details. Population counts for children aged 0-17 are taken from the 5-Year American Community Survey.

Use Cases

To learn how the COI has been used by organizations and researchers, please see our impact stories. For a list of reports and peer-reviewed studies, please see our COI bibliography. For a list peer-reviewed studies citing the COI on PubMed, please follow this link to the PubMed database.


To interactively explore COI 3.0 data, please see our interactive COI 3.0 map. For COI 3.0 data visualizations focused on the 100 largest metropolitan areas, please follow this link.

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