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Only 5M US millionaires. So math problems somewhere: http://www.cnbc.com/id/47631154

That link is talking about people with $1M in investible assets; I'm guessing the original link is counting people with $1M net worth.

Im guessing author used data like this (http://blogs.wsj.com/wealth/2007/02/01/rich-o-meter-20/) which is household, not individual