National Association of Realtors (NAR)
founded in 1908, whose members are known as REALTORS ®, the largest trade organization for realtors and one of the most powerful lobbying groups in North America.
It has over 1.2 million members and is involved in all aspects of the residential and commercial real estate industries. NAR also functions as a self regulatory organization for real estate brokerage. The organization is headquartered in Chicago, USA.
http://www.realtor.org
http://www.realtor.org