A complete list of all the special state quarters released as part of the 50 State Quarters program can be found at the U.S. Mint. Pictures of each of the quarters can be viewed there as well.
As stated by the U.S. Mint, the 50 State Quarters program was started in 1998. Under the program, five quarters were released every year for 10 years, in the order in which the various states joined the United States of America. The front side of each coin displays the standard image of George Washington, while the reverse side was engraved with a specific image chosen by each state.