Los Alamos County's 2026 population is estimated at 19,387, reflecting a -0.1% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Los Alamos County is the 20th largest county in New Mexico. The 2010 population was 17,995 and has grown 7.74% since 2010.
Overall: 39.3 years
Female: 40.6 years
Male: 38.7 years
There are 15,157 adults, (3,573 of whom are seniors) in Los Alamos County.
Female: 9,352 (48.1%)
Male: 10,083 (51.9%)
The racial composition of Los Alamos County includes 74.74% White, 4.95% Asian, 3.48% other race, and smaller percentages for Native American, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 14,526 | 74.74% |
| Two or more races | 2,834 | 14.58% |
| Asian | 962 | 4.95% |
| Other race | 676 | 3.48% |
| Native American | 253 | 1.3% |
| Black or African American | 168 | 0.86% |
| Native Hawaiian or Pacific Islander | 16 | 0.08% |
Los Alamos County 's average per capita income is $95,217. Household income levels show a median of $147,139. The poverty rate stands at 3.53%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $183,125 | - |
| Families | $173,051 | $206,122 |
| Households | $147,139 | $170,885 |
| Non Families | $90,673 | $107,999 |
Average Income
Median Household Income
Poverty Rate