Environmental and conservation organizations - Membership 2005-2006

This graph shows the number of members by national environmental and conservation organizations in 2005-2006. The Sierra Club had 778,830 members.

Membership of selected national environmental and conservation organizations in the United States in 2005-2006

Characteristic	Number of members
National Wildlife Federation	1,261,167
World Wildlife Fund - US	1,133,547
The Nature Conservancy	972,000
Sierra Club	778,830
Natural Resources Defense Council	600,000
Ducks Unlimited	598,363
National Audubon Society	500,000
Defenders of Wildlife	490,000
Environmental Defense Fund	400,000
National Parks Conservation Association	297,000
The Wilderness Society	275,000
Ocean Conservancy	170,000
Greenpeace USA	138,804
Earthjustice	84,000
American Rivers	39,000
Izaak Walton League	37,520
Center for Health, Environment, and Justice	31,842
Trust for Public Land	31,760
League of Conservation Voters	31,754
National Park Trust	30,000
Friends of the Earth	18,000
Sea Shepherd Conservation Society	8,000
Earth Island Institute	6,000
Conservation International	2,974
Conservation Fund	1,800

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Release date

December 2008

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Region

United States

Survey time period

2005-2006

Supplementary notes

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.

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