Guam is 2.7 times larger than American Samoa.
Area: 199 km2 World Factbook
Population: 54,517 (July 2014) World Factbook
American Samoa is an unincorporated territory of the United States located in the South Pacific Ocean, southeast of Samoa. American Samoa consists of 5 main islands and 2 coral atolls. Wikipedia
Area: 544 km2 World Factbook
Population: 161,001 (July 2014) World Factbook
Guam is an organized, unincorporated territory of the United States in the western Pacific Ocean. It is one of five U.S. territories with an established civilian government. Wikipedia