Lori,

Zestimate accuracy is a frequent concern that I hear from agents. As you can imagine, it's pretty hard to have a computer model value 80 million homes throughout the country 3-times per week. We take massive amounts of data, have spent tens of millions of dollars, have assembled several dozen of the best statisticians and computer scientists from around the world, and have nearly a swimming pool full of computer servers all targeted at this challenge. And considering that we've never been inside the homes, the accuracy of Zestimates is actually pretty good nationwide. HOWEVER, there are big exceptions. In particular, we have a hard time valuing uncommon homes, especially high end homes. Frequently when our Zestimates are off it's because the underlying property data we have about a home is incorrect. We allow owners or their agents to claim a home and edit the home facts and then we re-Zestimate that home based on the new data. Whenever a home is listed for sale we automatically re-Zestimate it with the property attributes from the listing. If you're interested in learning more about Zestimates and how they interact with your listings, here's a good video on the topic.

Lanre,

Unfortunately the file that I embedded here is all the detail that we have on traffic by geography. One proxy though would be to look at the number ot times a specific home has been viewed. In the upper right hand corner of any home details page we show the # of times the home has been viewed overall. If you click on that number it takes you to a page where you can scroll down and see the # of views for that home for that month, and for the zip code, city, county and state. For example, look at this home. Scroll down and you can see that homes in Maryland have been viewed 74,321,600 times since we launched the website 4 years ago, and 359,135 times so far in August.

Jim & Bob,

That is an excellent question which in retrospect I should have addressed in the original post.Here are some statistics about our website's visitors:

- about 75% of our visitors are consumers, and 25% say they're real estate professionals. Within the category of professionals, agents and brokers make up about 12% of our total traffic so in each month about 1 million of your colleagues visit Zillow. Considering that NAR estimates there are about 1 million people practicing with real estate licenses in the country, that means that almost all agents check Zillow at least once a month.

- 87% of our visitors already own a home.

- About 2/3 of our visitors are either in the market to buy a home now, or say they will be in the near future.  I think this is the most important and perhaps surprising statistic because there's a misperception that Zillow just attracts lookie-loos who are interested in real estate porn but not in buying homes. Untrue.

- 25% of our visitors say they use Zillow as "my primary real estate shopping website"

- our average household income is about $90,000 which makes our audience the most affluent of any real estate website. More information about our audience can be found here on the website.