County · New Mexico
Los Alamos County, New Mexico
Los Alamos County, New Mexico. Los Alamos County had 19,407 residents in 2025 by the Census Bureau's estimate, about level with 2020, in line with New Mexico (+0.4%). It holds 2 places (2 census-designated) and 4 census tracts. GEOID 35028.
Los Alamos County is the county of the Los Alamos, NM micropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
19,407
Census Bureau estimate (no margin published)
2020 Census count: 19,419 · ACS 2020-2024: 19,435
Median household income
$147,139
±$10,556 (90% margin)
New Mexico: $64,059
Median home value
$495,800
±$24,607 (90% margin)
New Mexico: $248,100
Median gross rent
$1,375
±$119 (90% margin)
New Mexico: $1,067
How many people live in Los Alamos County, and is it growing?
The 2020 Census counted 19,419 residents in Los Alamos County. The Census Bureau estimates 19,407 for July 1, 2025, about level with 2020, in line with New Mexico (+0.4%). The 2020-2024 American Community Survey puts the population at 19,435 over 109 square miles of land.
| Measure | Los Alamos County | New Mexico | Change since 2015-2019 |
|---|---|---|---|
| Total population | 19,435 | 2,120,246 | +810 |
| Households | 8,247±164 | 837,414 | +316 |
| Average household size | 2.35±0.05 | 2.48 | no clear change |
| Housing units | 8,713±27 | 956,964 | +329 |
Los Alamos County's population since 2000
From 18,343 in 2000 to 19,407 in 2025: up 5.8%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Los Alamos County?
Los Alamos County holds 2 places: 2 census-designated places. The largest is Los Alamos with 13,317 residents (2020-2024). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Los Alamos | 13,179 | $141,018 |
|---|---|---|
| White Rock | 5,852 | $156,639 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Los Alamos County?
The median resident of Los Alamos County is 39.3 years old; 22.0% are under 18 and 18.4% are 65 or older. The largest group is non-Hispanic white residents at 69.8%, then Hispanic or Latino residents (of any race) at 18.0%. 9.4% of residents were born outside the United States.
| Measure | Los Alamos County | New Mexico | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.3±1.1 | 39.4 | −3.0 |
| Under 18 years | 22.0%±0.3 pts | 21.7% | – |
| 65 years and over | 18.4%±0.4 pts | 19.3% | – |
| Hispanic or Latino (any race) | 18.0% | 48.4% | no clear change |
| White alone, not Hispanic | 69.8%±0.5 pts | 36.0% | −2.0 pts |
| Black or African American alone, not Hispanic | 0.9%±0.5 pts | 1.8% | no clear change |
| Asian alone, not Hispanic | 4.9%±0.8 pts | 1.6% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.6%±0.3 pts | 8.5% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1%±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 5.3%±1.1 pts | 3.1% | – |
| Some other race alone, not Hispanic | 0.4%±0.4 pts | 0.5% | – |
| Born outside the United States | 9.4%±1.5 pts | 9.4% | no clear change |
| Speak a language other than English at home (age 5+) | 14.6%±2.3 pts | 31.3% | – |
| Civilian veterans (age 18+) | 7.3%±1.4 pts | 7.9% | – |
| With a disability | 10.6%±1.7 pts | 17.0% | – |
| No health insurance coverage | 2.5%±1.0 pts | 9.6% | no clear change |
| High school graduate or higher (age 25+) | 98.3%±0.8 pts | 88.0% | – |
| Bachelor's degree or higher (age 25+) | 69.7%±3.3 pts | 31.0% | no clear change |
| Graduate or professional degree (age 25+) | 44.2%±3.4 pts | 13.9% | – |
| Moved from another state in the past year | 6.4%±1.8 pts | 3.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Los Alamos County earn?
Half of Los Alamos County's 8,247 households earn less than $147,139 a year (±$10,556), against $64,059 in New Mexico. In 2015-2019 it was $149,313 in 2024 dollars; the margins of error cannot tell the two periods apart. 3.5% of residents live below the poverty line.
| Measure | Los Alamos County | New Mexico | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $147,139±$10,556 | $64,059 | no clear change |
| Mean household income | $170,885±$10,431 | $88,155 | – |
| Per capita income | $74,704±$4,431 | $36,218 | no clear change |
| People below the poverty line | 3.5%±1.5 pts | 17.8% | no clear change |
| Children under 18 below the poverty line | 5.2%±3.6 pts | 24.0% | – |
| Households receiving SNAP | 4.2%±1.7 pts | 19.2% | – |
| Households with a broadband subscription | 93.4%±2.1 pts | 86.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Los Alamos County?
Owners occupy 74.8% of Los Alamos County's occupied homes and renters 25.2%. The median owner-occupied home is valued at $495,800 by its owner (±$24,607). The median renter pays $1,375 a month including utilities, and 18.2% of renters pay 35% or more of their income on rent.
| Measure | Los Alamos County | New Mexico | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $495,800±$24,607 | $248,100 | +$123,146 |
| Median gross rent | $1,375±$119 | $1,067 | no clear change |
| Renters paying 35% or more of income on rent | 18.2%±7.1 pts | 41.7% | no clear change |
| Median monthly owner costs, with a mortgage | $2,315±$172 | $1,564 | – |
| Owner-occupied homes | 74.8%±3.5 pts | 70.0% | no clear change |
| Housing units | 8,713±27 | 956,964 | +329 |
| Homeowner vacancy rate | 0.8%±1.0 pts | 1.0% | – |
| Rental vacancy rate | 1.1%±1.8 pts | 5.9% | – |
| Single-family detached homes | 62.3%±3.2 pts | 64.5% | – |
| Mobile homes | 5.1%±2.3 pts | 15.5% | – |
| Built 2020 or later | 3.8%±2.1 pts | 1.4% | – |
| Built 1939 or earlier | 0.1%±0.2 pts | 4.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Los Alamos County building?
Builders took permits for 15 new housing units across Los Alamos County in 2025 (15 single-family), 0.8 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Los Alamos County get to work?
71.8% of Los Alamos County's workers drive alone and 15.6% work from home. The average trip to work takes 14.7 minutes.
| Measure | Los Alamos County | New Mexico | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 67.8%±2.4 pts | 57.8% | – |
| Unemployment rate | 0.6%±0.4 pts | 6.0% | – |
| Drove alone to work | 71.8%±4.2 pts | 73.6% | – |
| Carpooled | 7.2%±2.4 pts | 9.9% | – |
| Public transportation | 1.2%±0.9 pts | 0.6% | – |
| Walked | 2.2%±1.2 pts | 1.9% | – |
| Worked from home | 15.6%±3.0 pts | 12.2% | +11.9 pts |
| Mean travel time to work | 14.7 min±1.2 | 23.5 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Los Alamos County's census tracts?
Los Alamos County is divided into 4 census tracts. Among those with a reliable estimate, median household income runs from $104,028 (Tract 4) to $161,867 (Tract 2).
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Los Alamos County compare with New Mexico's other counties?
| Measure | Rank |
|---|---|
| Population | 20th of 33 |
| Growth 2020-2025 | 11th of 33 |
| Residents per square mile | 2nd of 33 |
| Median household income | 1st of 32 |
| Median home value | 1st of 32 |
| Median gross rent | 3rd of 31 |
| Poverty rate | 33rd of 33 |
| Bachelor's degree or higher | 1st of 33 |
| Median age | 21st of 33 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Los Alamos County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.