Guam Zip Codes - Offers an up-to-date and complete listing of Guam zip codes. - http://www.guamzipcodes.com/
University of Texas Libraries - Guam Maps - Country, city and thematic maps from the Perry-CastaƱeda Library Map Collection, along with links to maps on other web sites. - http://www.lib.utexas.edu/maps/guam.html
Guam's location - Map and aerial photograph. - http://ns.gov.gu/location.html