MLS stands for Multiple Listings Service. The OKC MLS is a site that Realtors subscribe to and communicate through. Through membership at their local board (OKCMAR), Realtors are able to post their new listings and immediately following all other Realtors are able to see the new listings. The public typically sees this updated information within 24 hours through public sites but it completely depends on which sites they search. Not all information online is accurate or timely.