If Wal-Mart were a country, its revenues would make it on par with the GDP of the 25th largest economy in the world by, surpassing 157 smaller countries.

We've found 25 major American corporations whose 2010 revenues surpass the 2010 Gross Domestic Product of entire countries, often with a few billion to spare.

Even some major countries like Norway, Thailand, and New Zealand can be bested by certain U.S. firms.