Los Alamos County, New Mexico

Los Alamos County: County in New Mexico, United States


Los Alamos County is a county located in the U.S. state of New Mexico. As of the 2010 census, the population was 17,950 and a population density of 63 people per km². After 10 years in 2020 county had an estimated population of 19,462 inhabitants. Its county seat is Los Alamos. The county was created 74 years ago in 1948.

Los Alamos County locator map
Location of Los Alamos County on New Mexico map.

Quick Facts about Los Alamos County

Population : 19,462 (2020)
Country : United States of America
State : New Mexico (United States)
Area : 283 km2
Water as percent of area : 0.08%
Land as percent of area : 99.92%
Named for : Los Alamos
Altitude : 7,175 feet / 2187 meters
Capital : Los Alamos
Establishment : January 01, 1949
Time Zone : UTC−07:00
Local time : 21:22:30 (28th September 2023)
Density : 69 Pop. per km² as of 2020
Population growth : 7.77% (2010-2020)
Weather : 51℉ Partly Cloudy 7-days weather
Ashley Pond image
Ashley Pond
Ashley Pond image


Los Alamos County is located at 35°52'10"N 106°18'26"W (35.8693700, -106.3072900). It has 3 neighbors: Rio Arriba County, Sandoval County and Santa Fe County.

Los Alamos County map

Los Alamos County Populated Places

Cities, towns, neighborhoods & other populated places in Los Alamos County.

City Name Population Title
Los Alamos 12,019 Townsite in New Mexico


Los Alamos County forecast: Partly cloudy, with a low around 51. more

Los Alamos County has 3 neighbours.

  • Los Alamos


The population of Los Alamos County increased by 7.77% in 10 years.

Year Population % Change Method
2010 17,950 - census
2011 18,229 1.53% estimation process
2012 18,234 0.03% estimation process
2013 17,947 -1.6% estimation process
2014 17,803 -0.81% estimation process
2015 17,817 0.08% estimation process
2016 18,209 2.15% estimation process
2017 18,742 2.84% estimation process
2018 18,988 1.3% estimation process
2019 19,369 1.97% estimation process
2020 19,462 0.48% estimation process

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New Mexico Other Counties (more counties)

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