What Is MARIS MLS (Mid America Regional Information Systems) in Real Estate?

MARIS MLS refers to Mid America Regional Information Systems, a large Multiple Listing Service serving real estate professionals throughout Missouri and Southwestern Illinois. MARIS provides property data, MLS listing access, member tools, and regional market coverage for more than 15 REALTOR® associations across the Midwest.

🏙️ How MARIS MLS Works

MARIS functions as a centralized MLS system where licensed REALTORS® and brokers can list, update, and manage properties across Eastern Missouri and Southern Illinois. The MLS provides real-time property data, collaboration tools, and syndication to top consumer websites like Realtor.com, Zillow, and brokerage IDX networks.

  • Coverage area: Eastern Missouri and Southwestern Illinois, including St. Louis, St. Charles, and Belleville.
  • Operated by: Mid America Regional Information Systems (MARIS).
  • Integration: Data feeds flow to Realtor.com, Zillow, and brokerage websites through MLS/IDX syndication.
  • Membership: More than 14,000 real estate professionals across Missouri and Illinois.

💡 Why MARIS MLS Matters for FSBO Sellers

Buyer agents rely on MARIS MLS as the primary source for accurate, up-to-date property listings throughout the St. Louis region and surrounding markets. Through a flat fee MLS plan with Brokerless, FSBO sellers can gain MLS exposure without paying the traditional 6% commission—reaching motivated buyers across Missouri and Illinois.

📍 MARIS MLS Coverage Area

  • St. Louis City & County
  • St. Charles County
  • Jefferson County
  • Franklin County
  • Lincoln County
  • Warren County
  • Washington County
  • Cape Girardeau region
  • Southern Illinois — including Belleville, Edwardsville, and O’Fallon

Explore MLS systems across the U.S. in our Flat Fee MLS directory.

📚 Learn more in our Real Estate Glossary.