If you go to Zillow.com, at the bottom of the listing it states: Listing Provided by: Judy Nelson, Adkins, McNeill, Smith & Associates Realtors, phone number, Source: iHOUSEweb, Inc. How did iHOUSEweb, Inc. get the listing information? Zillow, Trulia, etc. gets listing informtion from various sources - including iHOUSEweb, Inc.
Zillow and Trulia are the same company now. Zillow bought out Trulia about 2 years ago.