This website mentions 501(c)(3) which grants federal tax exemption to qualifying nonprofit organizations, which can be public charities, private foundations, or private operating foundations.
https://www.501c3.org/
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Get access to data on 91,471 websites that are 501c3 Status Nonprofit Customers. We know of 75,254 live websites using 501c3 Status Nonprofit and an additional 16,217 sites that used 501c3 Status Nonprofit historically and 72,457 websites in the United States.
Get a list of 91,471 websites using 501c3 Status Nonprofit which includes location information, hosting data, contact details, 75,254 currently live websites and an additional 112,994 domains that redirect to sites in this list. 16,217 sites that used this technology previouslyand 72,457 websites in the United States currently using 501c3 Status Nonprofit.
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