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Zillow’s Transaction and Assessment Database (ZTRAX)
It used to be available to academic researchers on a request-basis for free, but Zillow has decided to discontinue the program.
The Zillow Transaction and Assessment Dataset (ZTRAX) is the country’s largest real estate database made available free of charge to U.S. academic, nonprofit and government researchers. Zillow makes the data — previously inaccessible and/or prohibitively expensive — available in the interest of greater transparency in the real estate market. They are used by dozens of institutions to further research across various disciplines and to address important policy questions.
ZTRAX is updated quarterly and is continually growing. Released data include:
More than 400 million detailed public records across 2,750+ U.S. counties;
More than 20 years of deed transfers, mortgages, foreclosures, auctions, property tax delinquencies and more, for both commercial and residential properties;
Property characteristics, geographic information and prior valuations for approximately 150 million parcels in 3,100+ counties nationwide.