Guam is 19% larger than Palau.
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
Area: 459 km2 World Factbook
Population: 21,186 (July 2014) World Factbook
Palau, officially the Republic of Palau, is an island country located in the western Pacific Ocean. It is geographically part of the larger island group of Micronesia. The country's population of around 21,000 is spread across 250 islands forming the western chain of the Caroline Islands. Wikipedia