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
Educational attainment is the headline number in Los Alamos County: 68.2% of adults 25 and older have a four-year degree. With 19,374 residents, Los Alamos County is a county in New Mexico. It ranks #20 among counties in New Mexico by population.
Income is a real outlier — the median household pulls in $143,188, putting Los Alamos County near the top of US counties. Hardship is rare relative to US counties: a poverty rate of just 3.0%, below the national 12.4%. Real estate commands a premium here — a median home value of $452,500, with typical rent around $1,308.
Los Alamos County is among the best-educated US counties: 68.2% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. About 14.2% of workers primarily work from home, close to the national 14.0%, and the average commute runs about 14 minutes each way.
The education numbers are the throughline: a college-heavy population in Los Alamos County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
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+
Largest cities in New Mexico
Other counties in New Mexico
Part of New Mexico
Metro areas in New Mexico
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.
More from New Mexico
Population 674,357
Population 221,665
Population 155,175
Population 151,538
Full rankings of New Mexico counties
Statewide data for New Mexico
Population, race, income, age, and trends across New Mexico
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.