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 142,275 websites that are 501c3 Status Nonprofit Customers. We know of 123,594 live websites using 501c3 Status Nonprofit and an additional 18,681 sites that used 501c3 Status Nonprofit historically and 119,299 websites in the United States.
Get a list of 142,275 websites using 501c3 Status Nonprofit which includes location information, hosting data, contact details, 123,594 currently live websites and an additional 137,551 domains that redirect to sites in this list. 18,681 sites that used this technology previouslyand 119,299 websites in the United States currently using 501c3 Status Nonprofit.
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