Department of the Interior - Office of Insular Affairs  
   Coordinates federal policy in the territories of American Samoa, Guam, the U.S. Virgin Islands, and the Commonwealth of the Northern Mariana Islands, and oversight of federal programs and funds in the freely associated states of the Federated States of M
   http://www.doi.gov/oia/

Census Bureau: Puerto Rico and the Island Areas  
   Census data and projections, information about history and geography, and other resources for Puerto Rico, American Samoa, Guam and the Northern Mariana Islands, the Virgin Islands, and Palau.
   http://www.census.gov/population/www/proas/proas.html