Guam Government US Unincorporated Territory Capital Hagatna Population 172 400 Land area 541 km² Max height above sea level 406 m EEZ 221 504 km² GDP Year 2016 Currency US dollar Languages English, Chamorro GDP per capita 34 177 USD Useful links Guam.gov: Official portal for the Island of Guam Guam Visitors Bureau Guam Economic Development Authority Pacific Community Membership 1983