Key facts about Guam
Island and Ocean Ecosystems
Guam is the southernmost island in the Mariana Islands Archipelago. Of all the islands in Micronesia, Guam is the largest in terms of both land area (543 sq km) and population (over 176,000 in 2008) (26,49). Politically, Guam is considered a U.S. territory and county and is divided into 19 districts (or US. Census Bureau county subdivision equivalents). Tamuning, the third most populated district, is located on the island's western shore. It contains approximately 11% of Guam's population (49) and is home to Guam's primary economic activities, including the tourism industry, Harmon Industrial Park, Antonio B. Won Pat International Airport, and Fort Juan Munaheadquarters of Guam's Army National Guard.