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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.
There are 325,569,772 people in the United States of America. If everyone in the U.S. lined up single file, the line would stretch around the Earth almost 7 times. That's a lot of people. The U.S. Census Bureau statistics tell us that there are at least 151,671 different last names and 5,163 different first names in common use in the United States. Some names are more common than others. There are 47,197 people named John Smith in the United States.