U.S. Population
U.S. population statistics from the U.S. Census Bureau
Check out their population clock to see how the U.S. population is changing second-by-second.
World population statistics
The World Factbook is published by the U.S. Central Intelligence Agency. This link will take you to a table that provides population statistics by country. You can also click on a country to go to an index for more information on that country.
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