- Agana, also known as Hagåtña, is the capital city of the United States territory of Guam. It is located on the western coast of the island and has a population of approximately 1,100 residents. Agana serves as the political, cultural, and economic center of Guam, with government buildings, commercial establishments, and cultural landmarks located within the city. Key attractions in Agana include the Agana Shopping Center, the Guam Museum, and the Plaza de España, which features an ancient Spanish fort called Fort Santa Agueda. The city has a tropical climate and is known for its beautiful beaches and vibrant Chamorro culture.