The Chamorro people are the indigenous people of the Mariana Islands, politically divided between the United States territory of Guam and the encompassing Commonwealth of the Northern Mariana Islands in Micronesia. Today, significant Chamorro populations also exist in several U.S. states, including Hawaii, California, Washington, Texas, Tennessee, Oregon, and Nevada, all of which together are designated as Pacific Islander Americans according to the U.S. Census. According to the 2000 Census, about 64,590 people of Chamorro ancestry live in Guam and another 19,000 live in the Northern Marianas. Another 93,000 live outside the Marianas in Hawaii and the West Coast of the United States. The Chamorros are primarily Austronesian, but many also have Spanish, Mexican, or Filipino ancestry.
Native Chamorros, descend primarily from Austronesian peoples and may also have other ancestries, such as Spanish, Mexican, Filipino, or Japanese. Chamorros and other Micronesians constitute about half the current population of Guam.