The number of households with a net worth of $1 million or more, not including their primary residence, grew by 600,000, or 8%, to 8.4 million in 2010, according to the “Affluent Market Insights 2011” report from Spectrem Group.

Their ranks grew by 16% in 2009 but fell by 27% in 2008.

In addition, the number of ultra-high-net-worth households, those with a net worth of $5 million or more, rose by 80,000, or 8%, to 1.06 million.

“The millionaire comeback continues,” said George H. Walper, Jr. “After taking a big recession-driven hit in 2008, the U.S. millionaire population staged a second-straight year of growth in 2010.”

In addition, the broader affluent population, households with a net worth of $500,000 or more, grew by 800,000, or 6%, to 13.5 million

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