As stated in our cover story, one of the main benefits of joining a Realtor association is to access the multiple listing service (MLS). Though syndication sites such as Trulia and Zillow, and online brokerages such as Redfin, offer capabilities similar to the MLS, none can compare to the accuracy of an official MLS.

We have listed the top 10 associations and MLS in the U.S., based on membership. MORe and CAR rank fourth and sixth, respectively; Chicagoland’s MLS, Midwest Real Estate Data (MRED), ranks third:

Top MLS

California Regional MLS: 68,000 members (Merged with SoCalMLS, Southern California’s MLS)

MRIS – VA, MD, DC, DE:
45,000 members

Georgia MLS: 43,000 members

MRED: 36,000 members

Arizona Regional Multiple Listing Service: 30,000 members

Miami Association of Realtors Multiple Listing Service:
25,000 members

My Florida MLS: 25,000 members

Houston Association of Realtors MLS: 24,000 members

Trend – PA, NJ, DE:
22,000 members

Northwest MLS (WA):
21,500 members

Top Associations

Miami Association of Realtors: 27,141 members

Houston Association of Realtors: 22,437 members

Long Island Board of Realtors:  18,455 members

Mainstreet Organization of Realtors:  13,968 members

MetroTex Association of Realtors (Dallas, Tex.): 11,766 members

Chicago Association of Realtors: 11,181 members

Greater Las Vegas Association of Realtors: 10,622 members

Greater San Diego Association of Realtors:  10,557 members

Pacific West Association of Realtors (Anaheim, Calif.): 10,343 members

Orange County Association of Realtors: 10,299 members