|Section 501 (c) entities are entities tax-exempt nonprofit organizations in the United States that obtained a 501(c) organization status from the IRS.
Some of the entities included in Section 501(c) include:
Corporations Organized Under Act of Congress (including Federal Credit Unions)
Religious, Educational, Charitable, Scientific, or Literary Organizations
Civic Leagues, Social Welfare Organizations, and Local Associations of Employees
Labor, Agricultural and Horticultural Organizations
Business Leagues, Chambers of Commerce, Real Estate Boards, etc.
Social and Recreational Clubs
For a complete list of Section 501(c) entities, please see IRS Publication 557