51% of the U.S. population has two or more credit cards, according to the Center for Media Research. I think we should should have as many cards as we feel you can manage responsibly. keep one credit card with a zero balance in a safe place outside the home. This way, if your wallet is stolen or your house burns down, you'll have a credit card to use while you wait to have the damaged or stolen cards replaced.

How You Can Profit from Credit Cards: Using Credit to Improve Your Financial Life and Bottom Line