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GuideStar: The National Database of Nonprofit Organizations Provides information on the missions, finances, programs, and management of nonprofit organizations, including foundations, public charities, and others. Search by name, keyword, city or state, nonprofit type (public charity, private operating foundation, or private nonoperating foundation), or income range.
Associations Unlimited Associations Unlimited contains information on international, national, regional, state and local nonprofit membership organizations in all fields. It includes IRS data on U.S. 501(c) nonprofit organizations.