The U.S. State Quarters series is one of the most popular coin collecting series of all times.
The 50 State Quarters program (Pub.L. 105-124, 111 Stat. 2534, enacted December 1, 1997) is the release of a series of commemorative coins by the United States Mint. Between 1999 and 2008, it featured each of the 50 individual U.S. states on unique designs for the reverse of the quarter.
In 2009, the U.S. Mint started issuing quarters under the 2009 District of Columbia and U.S. Territories Program, authorized by the passage of H.R. 2764. This program will feature the District of Columbia, Puerto Rico, American Samoa, Guam, the U.S. Virgin Islands, and Northern Mariana Islands. Although commonly mistaken as part of the 50 State Quarters Program, it is a separate program recognized by the U.S. Mint.
The program was conceived as a means of creating a new generation of coin collectors, and in that it succeeded. The 50 State Quarters program became the most successful numismatic program in history, with roughly half of the U.S. population collecting the coins, either in casual manner or as a serious pursuit. The U.S. federal government so far has made a profit of $4.6 billion from collectors taking the coins out of circulation.