Ranks of U.S. Millionaires Rose 8% Last Year, Trails High

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The number of U.S. millionaires increased by 600,000 in 2010, according to a report by Spectrem Group.

About 8.4 million American households had assets of $1 million or more, not including their primary residences, a gain of 8 percent, according to Chicago-based Spectrem. The figure is still below the 2007 high for millionaires, when there were 9.2 million in the U.S., Spectrem said.