Los Alamos County , New Mexico

Los Alamos County: County in New Mexico, United States

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


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 9 years in 2019 county had an estimated population of 19,369 inhabitants. Its county seat is Los Alamos. The county was created 72 years ago in 1948.


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.

Ashley Pond image
Ashley Pond

The largest city of Los Alamos County is White Rock with a population of 5,725. . See all Los Alamos County cities & populated places.

Ashley Pond image

Los Alamos County map

Los Alamos County Quick Facts

Population : 19,369 (2019)
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 : 15:35:20 (27th July 2021)
Density : 68 Pop. per km² as of 2019
Population growth : 7.33% (2010-2019)

Los Alamos County has 3 neighbours.

  • Los Alamos


The population of Los Alamos County increased by 7.33% in 9 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

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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
White Rock 5,725

New Mexico Other Counties (more counties)

County Name Population Title
New Mexico 2,096,829 State of the United States of America
Bernalillo County 679,121 County in New Mexico, United States
Albuquerque 560,513 Largest city in New Mexico; major city of the Albuquerque metropolitan area; part of CSA with state capital Santa Fe; county seat of Bernalillo County; 32nd largest city in the United States
Doña Ana County 214,295 County in New Mexico, United States
Santa Fe County 150,358 County in New Mexico, United States
Sandoval County 146,748 County in New Mexico, United States
San Juan County 123,958 County in southeastern Utah, United States
Las Cruces 103,432 City in and county seat of Doña Ana County, New Mexico, United States
Rio Rancho 99,178 City in New Mexico, United States
Enchanted Hills 87,521
Santa Fe 84,683 County seat city in Santa Fe County, New Mexico, USA and New Mexico federated state capital city
Valencia County 76,688 County in New Mexico, United States
McKinley County 71,367 County in New Mexico, United States
Lea County 71,070 County in New Mexico, United States
Otero County 67,490 County in New Mexico, United States
Chaves County 64,615 County in New Mexico, United States

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