What is an MLS (Multiple Listing Service)?
An MLS is a cooperative database that allows licensed real estate agents in Ontario to share property listings with each other, giving buyers and sellers broader market exposure than publicly available sites alone.
Multiple Listing Service, or MLS, is a private database operated by real estate boards across Ontario where licensed agents pool property listings for mutual access and sale. Rather than each agency maintaining its own inventory, the MLS creates a unified market where properties appear to all participating brokers almost simultaneously, giving sellers exposure to the widest possible pool of agents and buyers.
The Ontario Real Estate Association (OREA) oversees the largest MLS networks in the province, including the Toronto Real Estate Board system and regional boards serving London and surrounding areas. Only licensed real estate agents and brokers can list and search on the MLS, which keeps the data current and accurate for professionals negotiating on behalf of clients.
This differs fundamentally from public listing websites such as Zillow or Realtor.ca. Those sites aggregate MLS data after it is posted but do not offer the real-time updating, commission negotiation tools, or confidential property details that agents access directly. Homes listed through residential sales professionals typically appear on the MLS first, then sync to consumer-facing portals hours or days later.
For sellers, MLS placement means their property is shown to every agent in the board's territory who has a buyer looking. For buyers, working with an agent gives access to the complete, up-to-date inventory rather than only what appears on public portals. Commissions are negotiated and shared through MLS agreements, creating incentive for agents to cooperate on sales.