China and India are the world 's two most populous countries ; both have more than 1 billion people . ( CNN ) -- The United States is a distant third with a little more than 300 million people . Last on the list : Marshall Islands , with an estimated 48 people .
China and India are the world 's two most populous countries ; both have more than 1 billion people . The United States is a distant third with a little more than 300 million people . Last on the list : Marshall Islands , with an estimated 48 people .