How many millionaires and billionaires are there in the us today?

Millions
Approximately 15-20 million people are estimated to be millionaires, in the world. This may seem like a lot. However, this represents just 0.2 - 0.3% of the world's population.

Actually, the above figure is now believed to be too conservative of an estimate.

Globally, the number of millionaires in the world is increasing, while the number of multi-millionaires is decreasing. Currently, the number of millionaires in the world stands at about 10,000,000.