Guam is an unincorporated and organized territory of the United States in Micronesia in the western Pacific Ocean. The capital city of Guam is Hagåtña and the most populous city is Dededo. The inhabitants of Guam are called Guamanians, and they are American citizens by birth. Indigenous Guamanians are the Chamorros, who are related to other Austronesian natives to the west in the Philippines and Taiwan.
In 2016, 162,742 people resided on Guam. Guam has an area of 210 square miles and a population density of 775 per square mile. In Oceania, it is the largest and southernmost of the Mariana Islands and the largest island in Micronesia. Among its municipalities, Mongmong-Toto-Maite has the highest population density at 3,691 per square mile, whereas Inarajan and Umatac have the lowest density at 119 per square mile. The highest point is Mount Lamlam at 1,332 feet above sea level. Since the 1960s, the economy has been supported by two industries: tourism and the United States Armed Forces.
The indigenous Chamorros settled the island approximately 4,000 years ago.