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Direct sources. Here in Houston, nobody uses Zillow because their data is not reliably up-to-date. The city has a custom solution: har.com. It's not as pretty, but it's what all the realtors in the city actually use.
Yeah, here in the D.C. area, nobody's using Zillow for much either since the "Zestimates" are pretty wildly off of actual market value and even in between homes in the same area. For example, it puts my house at about $50k under my next-door neighbor's house, despite my home being larger, with more upgrades (about $100k worth), with one more bedroom and an additional full bathroom. The identical house to mine, a bloc…
The change in house prices block by block in many places can go from 20-30K to 300K to 800K depending on whether the block has been restored or are old burned out 100 year homes. Also, crime levels can change quite a bit in a one mile radius.