In the case of absent year-over-year sales price changes, there were certain historical pricing data that were incomplete or that First American CoreLogic deemed unreliable.

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And many borrowers are facing painful payment hikes: According to a First American CoreLogic study, one-third of ARMs taken out between 2004 and 2006 began with "teaser" rates below 4 percent.

NPR: Mass. Homeowners Rally Against Foreclosures

We based our rankings on the median home sales prices between July 2007 and June 2008 for each ZIP, as collected by First American CoreLogic, a national real estate data collection and research firm that tracks over 150 million parcels in over 3, 000 counties, amounting to 99% of all real estate transactions.

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