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(, meaning "The Cottonwoods") is a townsite and census-designated place (CDP) in Los Alamos County, New Mexico, United States. The population of the CDP was 11,909 at the 2000 census. The townsite or "the hill" is one part of town while White Rock is also part of the town. Technically, both are part of the same incorporated city/county. Los Alamos is home to the Los Alamos National Laboratory, which was founded to undertake the Manhattan Project. Los Alamos County is an incorporated county, and many county offices are located at the townsite of Los Alamos. Los Alamos High School is the public high school of Los Alamos County. Before the Manhattan Project, the site was occupied by the Los Alamos Ranch School. Los Alamos has a county council which the people elect to four-year terms. The county council is seven members with four or three persons elected every two years to the four-year terms. The council elects a chairman and vice-chairman.
Los Alamos is located at (35.891086, -106.297727), approximately 35 miles (56 km) to the northwest of Santa Fe. Elevation is 7320 feet.
According to the United States Census Bureau, the CDP has a total area of 10.9 square miles (28.1 km²), all of it land.