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At 3.8 million square miles (9.8 million km2) and with over 324 million people, the United States is the world's third-largest country by total area (and fourth-largest by land area) and the third-most populous.
Many people have asked us, How many billionaires are there in the United States?, As of March 1, 2016, there are 540 billionaires in the U.S. and currently there are 1,810 total billionaires in the world.