Nope, Zillow is not MLS.
Zillow receives its information from a variety of sources, but it is not the same as MLS. Many differences exist but the major ones revolve around accuracy and timing. There is no guarantee that what you see on Zillow is either a complete list or one whose availability is accurate. Furthermore, the timing between when a home is listed for sale in MLS and when it might appear on Zillow is Nope, Zillow is not MLS.
Serious buyers use MLS for their search. Click to learn more.