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Feeling crowded? As the world's population reaches 6 billion, elbow room can be hard to find. More than 270 million people live in the United States. That may sound like a lot, but in India - which is one-third the size of the United States - there are almost four times as many people! Here are the most populous countries:

1. China - 1.25 billion

2. India - 1 billion

3. U.S. - 273 million

4. Indonesia - 212 million

5. Brazil - 168 million

Source: Population Reference Bureau Inc. 1999
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