The National Wildlife Federation is the largest American conservation organization, with over 5 million members and supporters in 47 state-affiliated organizations; its annual budget is over $125 million as of 2006.
The National Wildlife Federation (NWF) is the United States' largest largest private, nonprofit conservation education and advocacy organization, with over 5 million members and supporters in 48 state-affiliated organizations. The NWF has an annual budget of over $125 million as of 2006.