The number of high-net-worth individuals in the top 10 U.S. metropolitan areas rose 17.5% in 2009, the highest growth rate in the last four years, according to the Capgemini 2010 U.S. Metro Wealth Index.

New York, Houston, Washington and San Jose all had more high-net-worth individuals — those with investable assets of $1 million or more — in 2009 than in 2007 before the financial meltdown hit.

The largest head-count increase, 28.9%, was in Houston. In New York, which had the most high-net-worth individuals, the increase was 18.7%.

Capgemini released the results Tuesday.

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