Largest MLSs in the U.S.: The Biggest Multiple Listing Services
The U.S. has fewer than 500 MLSs, and a small group of very large regional MLSs serves a big share of the country's agents. Here are the biggest.
How many MLSs are there?
T3 Sixty counted 484 MLSs in the U.S. as of December 31, 2025, down from 514 at the end of 2024 and about 850 in 2015.[2] RESO also reports tracking 484 U.S. MLS systems.[3]
The largest MLSs: the 19 "Mega+" MLSs
The 2026 Real Estate Almanac groups MLSs into size tiers. Its top tier, "Mega+," covers MLSs with 20,000 or more subscribers; it lists these 19, shown here alphabetically.[1]
| MLS | Main market | Links |
|---|---|---|
| Arizona Regional MLS (ARMLS) | Arizona | Official site ↗ · News |
| BeachesMLS | South Florida | Official site ↗ |
| Bright MLS | Mid-Atlantic | Official site ↗ · News |
| California Regional MLS (CRMLS) | California | Official site ↗ · News |
| Canopy MLS | North and South Carolina | Official site ↗ |
| First MLS (FMLS) | Georgia | Official site ↗ |
| Garden State MLS | New Jersey | Official site ↗ |
| Georgia MLS | Georgia | Official site ↗ |
| Houston Association of REALTORS® (HAR) MLS | Texas | Official site ↗ |
| Miami REALTORS® MLS | South Florida | Official site ↗ |
| Midwest Real Estate Data (MRED) | Illinois | Official site ↗ · News |
| MLS Property Information Network (MLS PIN) | New England | Official site ↗ |
| NorthstarMLS | Minnesota and Wisconsin | Official site ↗ |
| North Texas Real Estate Information Systems (NTREIS) | Texas | Official site ↗ |
| Northwest MLS (NWMLS) | Washington | Official site ↗ |
| OneKey MLS | New York | Official site ↗ · News |
| REcolorado | Colorado | Official site ↗ |
| SmartMLS | Connecticut and Rhode Island | Official site ↗ |
| Stellar MLS | Florida | Official site ↗ · News |
Which MLS is the biggest?
In T3 Sixty's 2025 ranking, Bright MLS was the largest with about 101,100 subscribers, followed by CRMLS with about 99,000 and Stellar MLS with 81,453, according to Real Estate News.[4] Subscriber counts change as MLSs merge and agents leave or join the business, so treat these figures as of their publication date.
Why size matters
Large regional MLSs have more leverage in data licensing and rule-making — and are at the center of current disputes. Several of the MLSs above are plaintiffs or parties in the Compass–MLS lawsuits. Follow consolidation in Mergers & Consolidation and regional news in Regional MLS News.
Sources
- Real Estate Almanac 2026 — MLS tier: Mega+ (20,000+ subscribers) — Real Estate Almanac / T3 Sixty
- 2026 Real Estate Almanac indices — T3 Sixty
- RESO — MLS FAQ — Real Estate Standards Organization
- 2025 MLS ranking coverage (Bright, CRMLS, Stellar subscriber counts) — Real Estate News, June 4, 2025
This guide is original MLS Daily News reporting based on the sources above. It is general information, not legal advice. Found an error? See our corrections policy.
