The National Taxonomy of Exempt Entities (NTEE) is a used by the Internal Revenue Service (IRS) and NCCS to classify U.S. tax-exempt organizations. A specialist from the IRS assigns an NTEE code to each organization exempt under I.R.C. § 501(a) as part of the process of closing a case when the organization is recognized as tax-exempt. For more information and more detailed definitions of these codes developed by the National Center for Charitable Statistics (NCCS), visit the Urban Institute. The NTEE classification system was developed by the

National Center for Charitable Statistics The National Center for Charitable Statistics (NCCS) is a clearing house for information about the nonprofit sector of the U.S. economy. The National Center for Charitable Statistics builds national, state, and regional databases and develops sta ...

. The IRS classifies nonprofit organizations using this system. X4Impact, with the support of the Rockefeller Foundation, Ford Foundation, Hewlett Foundation, and Giving Tech Labs, created a free interactive too
Nonprofit Code Finder
this online tool is updated every 15 days and enables users to find the most recent NTEE code, EIN number, and other relevant information for over 3.3 million tax-exempt organizations in the US.

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Further reading