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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.
Originally Answered: How many states are there in USA? First of all, most of the people older than 50 would answer this question with 52. 51 or 52 United States?