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Los Alamos County New Mexico ☎ +1 505-662-8083 Last Updated: 04/08/2026 |
| Los Alamos County is a county in the state of New Mexico. It is also home to one of the National Nuclear Security Agency's laboratories—the Los Alamos National Laboratory. According to the 2020 census, the population was 19,419. The county has two census-designated locations: Los Alamos and White Rock. Los Alamos is the county's administrative center and its largest community. | |
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New Mexico » Los Alamos County
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