Guidestar - The National Database of Nonprofit Organizations
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Guidestar is a great guide for donors, nonprofits and grantmakers. It is run by the Philanthropic Research, Inc., a 501(c)(3) nonprofit organization. There are very detailed reports on many nonprofits. The reports often include scanned copies of the organization's IRS Form 990 (Their financial disclosure document). Access is currently free for the public, although access to detailed information requires user registration.