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Los Alamos County

Facts about Los Alamos County, New Mexico

Los Alamos County (English: The Poplars or Cottonwoods) is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 17,950. The smallest county in area of this state was administered exclusively by the U.S. federal government during the Manhattan Project, but now has equal status to New Mexico's other counties. The county has two population centers known as CDPs: Los Alamos (the county seat) and 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.


According to the U.S. 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.


As of the 2010 census, there were 17,950 people, 7,663 households, and 5,199 families residing in the county. The population density was 164.4 inhabitants per square mile (63.5/km²). There were 8,354 housing units at an average density of 76.5 per square mile (29.5/km²). The racial makeup of the county was 87.8% white, 6.0% Asian, 0.8% American Indian, 0.6% black or African American, 0.1% Pacific islander, 2.2% from other races, and 2.6% from two or more races. Those of Hispanic or Latino origin made up 14.7% of the population. In terms of ancestry, 18.9% were German, 16.5% were English, 13.2% were Irish, and 6.5% were American.

Of the 7,663 households, 31.3% had children under the age of 18 living with them, 58.1% were married couples living together, 6.4% had a female householder with no husband present, 32.2% were non-families, and 28.5% of all households were made up of individuals. The average household size was 2.33 and the average family size was 2.86. The median age was 44.3 years.



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Los Alamos County 505-933-7959