RealtyTrac reported in its 2015 Natural Disaster Risk Report that 35.8 million U.S. single family homes & condos with a combined estimated market value of $6.6 trillion are in counties with high or very high natural hazard risk. Those 35.8 million homes represent 43 percent of the 83.4 million single family homes & condos.
For the report RealtyTrac assigned a natural disaster risk score to 2,318 counties nationwide with sufficient home value data available. Based on its score, each county was assigned to one of five risk categories for overall risk of natural disaster: Very High, High, Moderate, Low and Very Low. Similar scoring and ranking was also used to rate risk for each of the five natural disasters individually
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