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

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

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 manufacturing error on the 1999 Georgia state quarter has increased the coin’s value, and some collectors are paying as much as $10,000 for the affected 25-cent ...

Once known as the “Hobby of the Kings,” coin collecting is a global pastime open to anyone with an appetite for accumulation. Coins can be appreciated due to their artwork, their rarity or their ...