Get ready-to-use data, reports, analysis, and visualizations covering the demographics of Los Alamos County, New Mexico based on the current United States Census Bureau's 2023 American Community Survey (ACS) 5-Year Estimates.
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Los Alamos County, New Mexico Demographics: Sex by Age

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the total population of Los Alamos County, New Mexico is 19,374. The median age of the population in Los Alamos County, New Mexico is 41.1. The median age for males is 40.4 years, and for females, it is 41.6 years.
The age distribution of the population in Los Alamos County, New Mexico is as follows:
- Under 5 years: 4.51%
- 5–17 years (children): 16.91%
- 18–24 years (young adults): 5.85%
- 25–34 years: 14.25%
- 35–54 years: 26.17%
- 55–64 years: 14.14%
- 65 years and over (seniors): 18.16%
The total dependency ratio in Los Alamos County, New Mexico is 65.53%. The youth dependency ratio is 35.47%, and the old-age dependency ratio is 30.07%. In demographic terms, the dependency ratio measures the size of the population typically not in the labor force (children and older adults) relative to those of working age.
Los Alamos County, New Mexico Demographics: Population by Race & Ethnicity

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the population in Los Alamos County, New Mexico by race and ethnicity (racial demographics) is as follows:
- White: 70.27%
- Black/African American: 1.20%
- American Indian and Alaska Native: 0.74%
- Asian: 4.98%
- Native Hawaiian or Other Pacific Islander: 0.00%
- Some other race: 0.42%
- Two or more races: 4.50%
- Hispanic or Latino: 17.88%
The diversity index score in Los Alamos County, New Mexico is 46.95%, suggesting a moderate level of diversity.
Los Alamos County, New Mexico Demographics: Household Income

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Los Alamos County, New Mexico over the past 12 months, adjusted for 2023 inflation, was $143,188.
The distribution of household income by income bracket in Los Alamos County, New Mexico is as follows:
- Less than $20,000: 3.11%
- $20,000–$34,999: 4.86%
- $35,000–$49,999: 4.14%
- $50,000–$74,999: 8.07%
- $75,000–$149,999: 32.94%
- $150,000 or more: 46.88%
Los Alamos County, New Mexico Demographics: Educational Attainment

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the total population of Los Alamos County, New Mexico, age 25 and older, by educational level is as follows:
- Less than high school graduate: 1.69%
- High school graduate (incl. equivalency): 10.17%
- Some college or associate's degree: 19.89%
- Bachelor's Degree: 25.00%
- Graduate or professional degree: 43.24%
In Los Alamos County, New Mexico, 68.25% of the population has a bachelor's degree or higher, while 98.31% are high school graduates or higher.
Los Alamos County, New Mexico Demographics: Health Insurance Coverage Status by Sex by Age

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the uninsured rate in Los Alamos County, New Mexico is 3.39%.
Rates of people in Los Alamos County, New Mexico lacking health insurance coverage, by age group and sex are as follows:
- Under 18: 0.00% of males and 2.23% of females are uninsured
- Ages 18–34: 4.27% of males and 4.13% of females are uninsured
- Ages 35–64: 5.51% of males and 3.82% of females are uninsured
- Ages 65 and older: 0.42% of males and 0.91% of females are uninsured
Los Alamos County, New Mexico Demographics: Nativity and Citizenship Status in the United States

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 95.46% of people living in Los Alamos County, New Mexico are U.S. citizens. This includes individuals born in the United States, Puerto Rico, or U.S. Island Areas, those born abroad to American parents, and those who became citizens through naturalization. 6.56% of the population obtained U.S. citizenship through the naturalization process. In Los Alamos County, New Mexico, 6.56% of the population are naturalized immigrants, who obtained U.S. citizenship through the immigration and naturalization process.
Los Alamos County, New Mexico Demographics: Means of Transportation to Work

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the means of transportation to work for the population of Los Alamos County, New Mexico are distributed as follows:
- Car, truck, or van: 79.83%
- Public transportation (excluding taxicab): 1.66%
- Bicycle: 1.15%
- Walked: 2.07%
- Taxicab, motorcycle, or other means: 1.09%
- Worked from home: 14.21%
Frequently Asked Questions
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the age breakdown of the population of Los Alamos County, New Mexico is as follows:
- Under 5: 4.51%
- Ages 5–17: 16.91%
- Ages 18–24: 5.85%
- Ages 25–34: 14.25%
- Ages 35–54: 26.17%
- Ages 55–64: 14.14%
- 65 or older: 18.16%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the racial demographics of the population of Los Alamos County, New Mexico are as follows:
- White: 70.27%
- Black/African American: 1.20%
- American Indian and Alaska Native: 0.74%
- Asian: 4.98%
- Native Hawaiian or Other Pacific Islander: 0.00%
- Some other race: 0.42%
- Two or more races: 4.50%
- Hispanic or Latino: 17.88%
* Hispanic includes respondents of any race. Other categories are non-Hispanic.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the distribution of household income in Los Alamos County, New Mexico by income bracket is as follows:
- Less than $20,000: 3.11%
- $20,000–$34,999: 4.86%
- $35,000–$49,999: 4.14%
- $50,000–$74,999: 8.07%
- $75,000–$149,999: 32.94%
- $150,000 or more: 46.88%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Los Alamos County, New Mexico in the past 12 months, in 2023 inflation-adjusted dollars, was $143,188.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 70.27% of the population in Los Alamos County, New Mexico identifies as White alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 1.20% of the population in Los Alamos County, New Mexico identifies as Black or African American alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 3.39% of the population of Los Alamos County, New Mexico lacks health insurance coverage.
The detailed breakdown by age and sex is as follows:
- Under 18: 0.00% of males and 2.23% of females
- Ages 18–34: 4.27% of males and 4.13% of females
- Ages 35–64: 5.51% of males and 3.82% of females
- Ages 65 and over: 0.42% of males and 0.91% of females