Negative equity, often referred to as "underwater" or "upside down," means that borrowers owe more on their mortgage than their homes are worth.

Data Highlights

Nearly 10.7 million, or 23 percent, of all residential properties with mortgages were in negative equity as of September, 2009. An additional 2.3 million mortgages were approaching negative equity, meaning they had less than five percent equity. Together negative equity and near negative equity mortgages account for nearly 28 percent of all residential properties with a mortgage nationwide.

The distribution of negative equity is heavily concentrated in five states: Nevada (65 percent), which had the highest percentage negative equity, followed by Arizona (48 percent), Florida (45 percent), Michigan (37 percent) and California (35 percent). Among the top five states, the average negative equity share was 40 percent, compared to 14 percent for the remaining states. In numerical terms, California (2.4 million) and Florida (2.0 million) had the largest number of negative equity mortgages accounting for 4.4 million or 42 percent of all negative equity loans