The Last six coins of the State Quarters series are the U.S.

Territories:

District of Columbia 

Puerto Rico

Guam

American Samoa

U.S. Virgin Islands

The Northern Mariana Islands.

What a great addition to the set of 50 American State Quarter Coins, five different states are released each year starting from 1999 & ending in 2008 plus these 6 US Territory Quarter coins, equaling 56 coins. 

Each coin is minted in Philadelphia & Denver Mints, thus each coin has a Mint Mark "D" or "P".  Please let us know if you want a particular Mint Mark