Crain’s just released an interactive map for Chicago that shows home price changes by zip code for the first 6 months of the year. Not sure if you can see this without a subscription though. Also, there are a lot of zip codes with no data. However, where the data is available it shows that home prices fell throughout the city, with most of the northern parts experiencing moderate declines of 0.1 – 3.9%. The larger declines were in the southwest edges of the city. In those areas prices declined between 5.7% – 18.5%.
The data comes from Fiserv, which calculates the Case Shiller home price index – one of the few indices that calculates price changes correctly.