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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.
How many people live in the United States? As of July 2013, the population of the United Stated was estimated to be just over 316 million people. In October 2014, the U.S. Census Bureau estimated that the population had surpassed 319 million.