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Los Alamos County is a county in the state of New Mexico. Based on the 2010 census, the population was 17,950. The smallest county in
area of this state was administered exclusively by the US federal government during the Manhattan Project, but now has equal status to New
Mexico's other counties. The county seat is Los Alamos. The other population center in the county is White Rock.
Los Alamos County comprises the Los Alamos, NM Micropolitan Statistical Area, which is also included in the Albuquerque-Santa Fe-Las Vegas, NM Combined Statistical Area.
Named for its principal town
County QuickFacts: CensusBureau Quick Facts
Los Alamos County was created 16 March 1949. The county seat is Los Alamos. This is the smallest county in New Mexico. Small packages pack a big punch! The famous Manhattan Project was completed here. This county remains important in the nuclear and scientific area. Friendly people, clear skies and fresh air make this a popular county.
As reported by the Census Bureau, the county has a total area of 109 square miles (280 km2), of which 109 square miles (280 km2) is land
and 0.09 square miles (0.23 km2) (0.08%) is water.
It is the smallest county by area in New Mexico. There is no significant open water in the county. The county's highest point is located along its northern border, near the summit of Caballo Mountain, at 10,480 feet above sea level.
Bordering counties are as follows: