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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.
The first decennial census in the United States showed a population of just under four million people. Today, the U.S. population is estimated at more than 310 million. Here you will find a list of the U.S. population every ten years from the first official census in 1790 to the most recent in 2000. 1790 - 3,929,214. 1800 - 5,308,483.