Kottke has a post today wherein he shows how little space would be required to house the United States' entire population if it were packed as densely as The Bronx, Manhattan, or Manila?

I decided to ask the question from the other angle: What would the population of the US be if the entire area were populated as densely as The Bronx, Manhattan, or Manila.

The area of the United States is 3,794,101 sq mi. At the density of The Bronx (33,000) the population of US would be 125 billion. The density of Manhattan is more than twice The Bronx, so at 71,000 the US population would go up to 270 billion. Manila is the the most densely populated city in the word. They pack 1,660,714 people into 14.88 sq mi at a density of 111,000. If the entire US were packed like that, the population would be 423 billion people. And if the entire planet were as dense as Manila? The land mass of Earth is 148,940,000 sq mi. That would be over 16 trillion people.