Non-governmental organizations (NGOs) are called "the third sector" in America. According to the survey, the total number of non-governmental organizations in the United States has exceeded 2 million, touching all walks of life, with a total capital of more than 500 billion and a staff of more than 9 million.

Among them, the famous NGOs are: American Environmental Protection Association, American Nature Conservancy, American Ford Foundation, American World Health Foundation, American wildaid Association, American Kangba Aid Foundation, Blue Moon Foundation, American Chamber of Commerce, Carter Center, San Francisco Public Communication Center, and American National Institute for Democratic International Affairs.