Top 20 MLS the United States

What are the largest MLSs in the United States? The table gives you the most updated list (10/10/2010), as well as links to their homepages, and their 2018 Membership numbers.

The National Association of REALTORS (NAR) is North America’s largest trade association for real estate helped set the general requirements for IDX and does a good job of coordinating the industry but the MLS space is a continually shifting landscape.

In November of 2018, a RESO official cited about 645 MLS. We’ve heard numbers as high as 1,100 when considering smaller and area specific groups.

Feel free to bookmark this page for your resource of the largest MLS. We’ll continue to update it for you, so you have a single resource.

Rank Company Name Corporate Office 2018 Membership
1 California Regional MLS San Dimas, CA 96,203
2 Bright MLS Rockville, MD 88,071
3 Stellar MLS Maitland, FL 58,600
4 MIAMI Association of Realtors (SEF Shared MLS Database) Miami, FL 50,019
5 Midwest Real Estate Data Lisle, Il 45,000
6 First Multiple Listing Service Atlanta, GA 42,438
7 MLS Property Information Network Shrewsbury, MA 41,537
8 New York MLS (Combined MLSli/HGAR MLS) West Babylon, NY 40,000
9 Georgia MLS Tucker, GA 39,209
10 North Texas Real Estate Information Systems Dallas, TX 38,522
11 Arizona Regional MLS Tempe, AZ 38,321
12 Houston Association Of Realtors Houston, TX 35,844
13 RAPB + GFLR (Beaches MLS) West Palm Beach, FL 33,204
14 Northwest MLS Kirkland, WA 30,984
15 REcolorado Greenwood Village, CO 24,113
16 Garden State MLS Parsippany, NJ 23,061
17 Metrolist Services Sacramento, CA 20,498
18 RMLS of Minnesota (Northstar MLS) St. Paul, MN 18,097
19 SMART MLS Wallingford, CT 17,762
20 Realcomp Farmington Hills, MI 16,729

What is an MLS?

multiple listing service (MLS, also multiple listing system or multiple listings service) is a suite of services that real estate brokers use to establish contractual offers of compensation (among brokers) and accumulate and disseminate information to enable appraisals. A multiple listing service’s database and software is used by real estate brokers in real estate (or aircraft broker[1] in other industries for example), representing sellers under a listing contract to widely share information about properties with other brokers who may represent potential buyers or wish to work with a seller’s broker in finding a buyer for the property or asset. The listing data stored in a multiple listing service’s database is the proprietary information of the broker who has obtained a listing agreement with a property’s seller.

According to the U.S. National Association of Realtors:

In the late 1800s, real estate brokers regularly gathered at the offices of their local associations to share information about properties they were trying to sell. They agreed to compensate other brokers who helped sell those properties, and the first MLS was born, based on a fundamental principle that’s unique to organized real estate: Help me sell my inventory and I’ll help you sell yours

There is no single authoritative MLS and no universal data format. However, there is a data standard for MLS systems—the Real Estate Transaction Standard—which is being deployed across MLS solutions in North America. However, the Real Estate Standards Organization has been spearheading the industry’s move to use more modern data formats, standard data definitions/fields, and coordinate leading industry organizations to build a new future of real estate data.

Each MLS in the U.S. are independent and offers direct data feeds to technology vendors via RETS and/or Web API. Our proprietary MLS aggregation technology connects your local MLS into our IDX engine and the most advanced home search available.

We deal with technology, so you do not have to, and we love geeking out on innovative technology that people use every day. How much do we love data and software people love? The Real Estate Standards Organization (RESO) wrote a case study on us, how our team helped build the navigation apps in your car and on your phone (pages 6 – 7, and Showcase IDX’s role in the real estate industry over the past 20+ years.

Start your free trial today. Find out why we’re the #1 rated IDX plugin and why the best web developers work with us.

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