Some state quarters in pristine condition could be worth well over $500. Before using your quarters, check whether you have any of these in your wallet.

Here are 20 rare state quarters worth additional value, according to Gainesville Coins, USA CoinBook and PCGS.

Starting in 1999, the U.S. Mint began a years-long program where they released aspecially designed quarter for all 50 states. It is widely lauded as the mostsuccessful coin program in the Mint's ...

A coin sitting in a jar or drawer could be worth thousands of dollars if it has a rare mistake from the U.S. Mint. Some 1999 state quarters from Georgia have sold for as much as $10,000 due to unusual ...