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 | Official name: Territory of Guam (English), Guåhan (Chamorro) Guam postal code abbreviation: GU Guam prefix phone numbers: 671 You may also be interested in the answers to the following questions: Total area: 540 km2 ✅ What is the largest city by population in Guam?- Largest Guam cities by population: Dededo ✅ What is the capital of Guam?- State capital of Guam: Hagatna ✅ What is the population of Guam?- Guam state population 2025: 168 801 |