Environmental and conservation organizations - Number of members

This data only considers organizations which filled the Form 990. The IRS Form 990 is titled "Return of Organization Exempt From Income Tax." It is submitted by tax-exempt organizations and non-profit organizations to provide the Internal Revenue Service with annual financial information. A short version, Form 990-EZ, may be used by organizations with gross receipts of between $25,000 and $500,000 and total assets of less than $2.5 million. (Organizations with gross receipts of under $25,000 in a year are not required to file a form 990). Another variant, Form 990-PF, is available for private foundation organizations.