Formed January 1, 1949 (32nd county)
Los Alamos County (19,418), Los Alamos* (13,179)
The Modern building is located on Central and Knetcht streets. New Mexico State Highway 502 is one block south. This dark red brick and concrete courthouse was built in 2010 to replace a 1967 structure. There was also a 1956 structure. WHPacific is the architect. An Administration building was also built in 2010. The county was created on January 1, 1949 from parts of Sandoval and Santa Fe counties as the 32nd county. Los Alamos has always been the county seat. The county and county seat both derive their names from the Spanish for “the poplars”. Los Alamos county and city have the same boundaries. Los Alamos County was the birthplace of 1 New Mexico Governor, Michelle L. L. Grisham.
Los Alamos County government consists of a manager, a sheriff, a treasurer, an attorney, an assessor, and a clerk (executive). It has 7 Council Members (legislative.) Seven District Court Judges serve Los Alamos, Rio Arriba, and Santa Fe counties (judicial.) The county is located in north central New Mexico just northwest of Santa Fe, New Mexico. The county center is in Los Alamos 1.5 miles East of the city center. The county is surrounded clockwise by Rio Arriba, Santa Fe, and Sandoval counties.
The area of the county is 109 square miles. It is 33 out of 33 in the state. It ranks 20 out of 33 in population in the state. It has a density of 178.1 persons per square mile making it 2 out of 33 in the state. Los Alamos County has 0.0% of its population in its incorporated areas since there are no incorporated cities. There are no Interstates or United States Highways in the county. The county shape is nearly square. The county and the city run combined government functions. Los Alamos is the county seat and the largest populated area. It is 67.9% of the county population. The county and seat are pronounced LOES AL-A-MOES. This county is in the Los Alamos Micropolitan Statistical Area.
Los Alamos
