The National Association of Realtors (NAR) is an American trade association for those who work in the real estate industry. It has over 1.5 million members, making it the largest trade association in the United States including NAR's institutes, societies, and councils, involved in all aspects of the residential and commercial real estate industries. The organization holds a U.S. trademark over the term "Realtor". NAR also functions as a self-regulatory organization for real estate brokerage. The organization is headquartered in Chicago.