Nevada negative equity mortgages ? 66% of all ! People owe more than house is worth. Reno-Sparks, NV, 55% ? or 54 764 active mortgages. US ? 32.2%, or 15.2 mill active mortgages. ...06/08 ? 41% for Reno-Sparks, or 33, 900, US 20%., or 8.3 mil active mortgages.