A couple of months ago I saw this request from Ryan Delk on Twitter: After a quick search I was able to find a real estate API matching his needs. It gave me an idea though, there are a lot of APIs for real estate data if you know where to look. So to make it easy I started a list of real estate APIs and broken them down by category. Some of the obvious ones are on here, Rets.ly, Zillow, Rets Rabbit, but there are a few more such as the great Community and Places API data from Onboard Informatics.