New Mexico

Los Alamos

19,419
2020 population
1950
first census record
8
census records

About Los Alamos

Los Alamos, New Mexico, first appears in the United States federal census in 1950, when it recorded a population of 10,476. At the most recent census, in 2020, its population stood at 19,419.

The county's recorded population has risen across the decades to its highest level in 2020.

On the ground today, 2 documented military engagements have been recorded within the county, among them Tyuonyi Conflict – Bandelier, Tsankawi Defensive Pueblo, and 14 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202019,419
201017,950
200018,343
199018,115
198017,599
197015,198
196013,037
195010,476
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

Battles & engagements in Los Alamos

Military engagements that took place in Los Alamos, New Mexico.

Tyuonyi Conflict – Bandelier
1400
Tsankawi Defensive Pueblo
1400

Historic places in Los Alamos

National Register of Historic Places listings in Los Alamos, New Mexico.

Bayo Road
Los Alamos
United States Post Office-Los Alamos, New Mexico
Los Alamos
Los Alamos Scientific Laboratory
Los Alamos
Grant Road
Los Alamos
Bandelier National Monument Archeological and Historic District (Boundary Increase)
Los Alamos
Bandelier CCC Historic District
Bandelier National Monument
Browse all New Mexicohistoric sites ›

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Explore census history and historic records for more New Mexico counties.

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Everything a full report reveals about Los Alamos County, New Mexico

This page charts the census history of Los Alamos County, New Mexico. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
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New Mexicohistory ›NRHP historic sites ›Notable people from New Mexico›

Frequently asked about Los Alamos

When does Los Alamos first appear in the US census?
Los Alamos, New Mexico first appears in the federal census in 1950, with a recorded population of 10,476.
What is the population of Los Alamos?
At the most recent federal census (2020), Los Alamos had a recorded population of 19,419.
Were any battles fought in Los Alamos?
2 documented military engagements took place in Los Alamos, including Tyuonyi Conflict – Bandelier, Tsankawi Defensive Pueblo.
How many historic places are in Los Alamos?
14 sites are listed on the National Register of Historic Places in Los Alamos, New Mexico.
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