http://www.huduser.org/Datasets/nsp_foreclosure_data.html

HUD’s Neighborhood Stabilization Program (NSP) local level foreclosure data is a statistically generated dataset to estimate a foreclosure rate as small as at a tract level. The data was created, under a new law, Economic Recovery Act of 2008, to assist local efforts to sustain high risk neighborhoods by acquiring and redeveloping foreclosed properties. Since foreclosure data is not readily available (no public & nationwide data sources available), some users may find the data useful. Remember: the data is not actual data but estimated numbers using public datasets – read the methdoroloogy document!

[Image left - HUD NSP Foreclosure Rate in Chicago metropolitan area (sorry, I forgot to add a legend!) - click on the image to enlarge]