I assume that you refer to an online audience. Realtor.com is the most active site when it comes to searching for homes on the web. All REALTORS, when listing on the MLS, will have some exposure on REALTOR.com yet, all should seriously consider adding "showcase listing" and "featured home" (additional fee) contracts to their REALTOR.com accounts. Agents should also utilize something like point2.com (free) to build an agent page and add listings which will then be syndicated through many different online sources and greatly increase exposure. If you are gaining the proper exposure, you will be able to Google your listing address, without city or state, and your listing will appear in the first 3 results. If your listing does not appear in the first 3, you need to re look at how you are marketing online. Once syndicated using point2 , Postlets or others, adding to Zillow and on ActiveRain will increase your exposure even more.