Zillow uses statistics which can skew the results. They can be either too high or too low. They also don't take into account the direction the market is trending....are we going up or down in value. What is the average number of days on the market, etc.
I'd be happy to email you a comparable analysis if you'd like to send me a private email. I only need the address. Then you can see all the comparables which are on the market now as well as the recent sales...and get a better picture than a Zillow can give you. I'll also give you my opinion of the market....I live and work in your area and am very familar with RSM and it's real estate market.