About 47,000 people had a net worth of $20 million or more in 2004, the latest available year, according to new estimates by the Internal Revenue Service. . . . the number of people with a net worth between $10 million and $20 million [was] 79,000 people[.]
The IRS estimates that there are 231,000 people with net worths of $5 million to $10,000,000; 247,000 with net worths of $2.5 million to $5,000,000; and 846,000 people with net worths of $2 million to $3.5 million.
In all, there are 1.45 million Americans with a net worth of $2 million or more. The population of the United States is a little over 300 million. So, a net worth of $2 million puts someone in the 99.5th percentile.
Separate IRS data, released earlier this year, showed the nation's top 400 taxpayers by income reported total income of $85.6 billion on their federal income-tax returns for 2005 -- an average of nearly $214 million apiece. Just to make the cutoff to be eligible for this group of 400 required income of at least $100.3 million, up from $74.5 million for 2004.
From here (citing this story).