Los Alamos County, New Mexico Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 20th-largest in New Mexico
The population of Los Alamos County, New Mexico is 19,374 as of the 2023 American Community Survey, making it the 20th-largest county in New Mexico. The median household income is $143,188, the median home value is $452,500, and the median age is 41.1.
The population of Los Alamos County has grown 9.3% since 2010 (17,995 → 19,675), a +0.64% annualized rate.
19,374
Population
+0.64%
Annual growth
178
People / sq mi
$143,188
Median Income
$452,500
Median Home Value
Los Alamos County covers 109 sq mi of land at 177.5 people per square mile.
About Los Alamos County, NM
Los Alamos County is a county in New Mexico with a population of 19,374. It ranks #20 among counties in New Mexico by population. The median age is 41.1, older than the national median. The population is 51.6% male and 48.4% female.
The median household income in Los Alamos County is $143,188, above the US median of $74,580. 3.0% of residents live below the federal poverty level. Home values sit at a median of $452,500, with monthly rent averaging $1,308. The homeownership rate of 74.5% is higher than the national rate of 64.8%.
Educational attainment in Los Alamos County reflects 68.2% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 14.2% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 14.4 minutes each way.
Los Alamos County Population History (2010-2024)
The county of Los Alamos County had a population of 17,995 in 2010 and 19,675 in 2024, a 9.3% growth over 14 years. The peak was 19,675 in 2024. Average annual growth rate: 0.65%.
19,675
Population (2024)
17,995
Population (2010)
19,675
Peak (2024)
0.65%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 17,995 |
| 2011 | 18,237 |
| 2012 | 18,248 |
| 2013 | 17,970 |
| 2014 | 17,830 |
| 2015 | 17,848 |
| 2016 | 18,241 |
| 2017 | 18,778 |
| 2018 | 19,018 |
| 2019 | 19,383 |
| 2020 | 19,422 |
| 2021 | 19,397 |
| 2022 | 19,259 |
| 2023 | 19,420 |
| 2024 | 19,675 |
Race & Ethnicity
| White | 76.3% |
| Black or African American | 1.2% |
| Asian | 0.5% |
| Hispanic or Latino (any race) | 2.1% |
| Two or More Races | 0.0% |
Age & Sex
41.1
Median Age
48.4%
Female
51.6%
Male
18.2%
Age 65+
Age Distribution
Children (under 15): 17.4% · Seniors (65+): 18.2%
Income & Poverty
| Median household income | $143,188+$81,063 vs state |
| Mean household income | $167,396 |
| Per-capita income | $72,684 |
| Poverty rate | 3.0%-10.7% vs state |
| Unemployment rate | 1.4% |
| Employment-to-population | 65.5% |
Top Industries by Employment
The largest employment sector in Los Alamos County is finance & real estate, accounting for 53.5% of workers.
How residents commute
1.7%
Drive alone
2.1%
Carpool
73.4%
Public transit
14.2%
Work from home
14.4 min
Avg commute
Housing
$452,500+$220,300 vs state
Median home value
$1,308
Median rent
74.5%
Homeownership rate
8,660
Total housing units
94.8%
Occupied
5.2%
Vacant
25.5%
Renter-occupied
Social & access
96.6%
With health insurance
98.4%
With broadband internet
58.3%
Foreign-born
7.7%
Veterans (18+)
10.4%
With a disability
83.4%
Speak language other than English at home
Education
98.3%
High School+
68.2%
Bachelor's+
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County rankings
Frequently Asked Questions
Los Alamos County, New Mexico has a population of 19,374 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 20th-largest county in New Mexico. Population density is 178 people per square mile.
The population of Los Alamos County has grown 9.3% since 2010 (17,995 → 19,675), a +0.64% annualized rate.
The median household income in Los Alamos County, New Mexico is $143,188, with mean (average) household income of $167,396 and per-capita income of $72,684. 3.0% of residents live below the federal poverty level.
In Los Alamos County, the largest racial and ethnic groups are White (76.3%), Hispanic or Latino (2.1%), Black or African American (1.2%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Los Alamos County, New Mexico is 41.1 years. Residents are 48.4% female and 51.6% male.
The median home value in Los Alamos County is $452,500 and median monthly rent is $1,308. 74.5% of occupied housing units are owner-occupied. The county has 8,660 total housing units, 5.2% of which are vacant.
The largest employment sector in Los Alamos County, New Mexico is finance, insurance, and real estate, employing 53.5% of workers. The unemployment rate is 1.4%.
Albuquerque is among the largest cities associated with Los Alamos County, New Mexico, with a population of 562,488.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.