Homes in the United States are expected to lose more than $1.7 trillion in value during 2010, which is 63% more than the $1 trillion lost in 2009, according to recent analysis of the Zillow Real Estate Market Reports.

The bulk of the total value lost during 2010 was in the second half of the year. From January to June, the housing market lost $680 billion. From June to December, Zillow projects residential home value losses will top $1 trillion.

Less than one-fourth (31) of the 129 markets tracked by Zillow showed gains in total home values during 2010. Among those were the Boston metropolitan statistical area (MSA), which gained $10.8 billion in value, and the San Diego MSA, which gained $10.2 billion.

Total market value was calculated as the sum of all Zestimate values, using forecasting to reach a projected total for the end of December 2010. Total home value change is calculated by subtracting the value of all homes in an area in December 2010 from the total value at the start of 2010.

The full list of markets is below.

Zillow Total Market Value by Metropolitan Statistical Area