Los Alamos County Demographics

A map of Los Alamos County's Population by Race

Los Alamos County, New Mexico has an estimated population of 19,435, a less than 1% change from the 19,419 recorded in the 2020 Census. The population is 69.8% White, 18.0% Hispanic, 5.3% Multiracial, 4.9% Asian, 1.1% Native American/Other, and 0.9% Black. This demographic dot map shows the population of Los Alamos County, with one dot drawn for each person counted by the Census, color-coded by race.

Los Alamos has become slightly less racially diverse since the 2020 Census. It is considerably less diverse than New Mexico overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Los Alamos County, that probability was 48.3% in 2020 and 47.5% in the most recent ACS estimates.

Los Alamos County is ranked the 20th most populous county in New Mexico, out of 33 counties. Los Alamos County was ranked the 20th most populous county in the 2020 Census.

Los Alamos County's White Population

13,569 residents of Los Alamos County, or 69.8% of the population, identify as White. The share of White residents in Los Alamos County is significantly higher than in New Mexico overall, where 36% of the population is White. Los Alamos County ranks 2nd statewide in terms of White residents as a share of the population, out of 33 counties.

Since the 2020 Census, Los Alamos County's White population has remained roughly the same. White residents' share of Los Alamos County's population has increased from 69.2% to 69.8%.

Los Alamos County is more White than neighboring Santa Fe County (44% White), Sandoval County (40.9% White), Rio Arriba County (14% White), Bernalillo County (37.1% White), and Taos County (40.5% White).

Los Alamos County's Black Population

168 residents of Los Alamos County, or 0.9% of the population, identify as Black. The share of Black residents in Los Alamos County is comparable to the share in New Mexico overall, where 1.8% of the population is Black. Los Alamos County ranks 19th statewide in terms of Black residents as a share of the population, out of 33 counties.

Since the 2020 Census, Los Alamos County's Black population has grown by an estimated 7.0%. Black residents' share of Los Alamos County's population has remained roughly unchanged at 0.9%.

Los Alamos County is more Black than neighboring Santa Fe County (0.8% Black), Rio Arriba County (0.6% Black), and Taos County (0.3% Black). Los Alamos County is less Black than neighboring Sandoval County (2.1% Black), and Bernalillo County (2.6% Black).

Los Alamos County's Asian Population

962 residents of Los Alamos County, or 4.9% of the population, identify as Asian. The share of Asian residents in Los Alamos County is slightly higher than in New Mexico overall, where 1.6% of the population is Asian. Los Alamos County ranks 1st statewide in terms of Asian residents as a share of the population, out of 33 counties.

Since the 2020 Census, Los Alamos County's Asian population has declined by an estimated 21.3%. Asian residents' share of Los Alamos County's population has decreased from 6.3% to 4.9%.

Los Alamos County is more Asian than neighboring Santa Fe County (1.4% Asian), Sandoval County (1.3% Asian), Rio Arriba County (0.6% Asian), Bernalillo County (2.8% Asian), and Taos County (0.7% Asian).

Los Alamos County's Hispanic Population

3,501 residents of Los Alamos County, or 18.0% of the population, identify as Hispanic. The share of Hispanic residents in Los Alamos County is significantly lower than in New Mexico overall, where 48.4% of the population is Hispanic. Los Alamos County ranks 31st statewide in terms of Hispanic residents as a share of the population, out of 33 counties.

Since the 2020 Census, Los Alamos County's Hispanic population has grown by an estimated 1.9%. Hispanic residents' share of Los Alamos County's population has remained roughly unchanged at 18.0%.

Los Alamos County is less Hispanic than neighboring Santa Fe County (47.9% Hispanic), Sandoval County (40% Hispanic), Rio Arriba County (67.2% Hispanic), Bernalillo County (49.1% Hispanic), and Taos County (50.6% Hispanic).

Los Alamos County's Native American/Other Population

213 residents of Los Alamos County, or 1.1% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Los Alamos County is lower than in New Mexico overall, where 9% of the population is Native American/Other. Los Alamos County ranks 20th statewide in terms of Native American/Other residents as a share of the population, out of 33 counties.

Since the 2020 Census, Los Alamos County's Native American/Other population has declined by an estimated 20.8%. Native American/Other residents' share of Los Alamos County's population has remained roughly unchanged at 1.1%.

Los Alamos County is less Native American/Other than neighboring Santa Fe County (3% Native American/Other), Sandoval County (11.7% Native American/Other), Rio Arriba County (16.2% Native American/Other), Bernalillo County (4.7% Native American/Other), and Taos County (5.6% Native American/Other).

Los Alamos County's Multiracial Population

1,022 residents of Los Alamos County, or 5.3% of the population, identify as Multiracial. The share of Multiracial residents in Los Alamos County is slightly higher than in New Mexico overall, where 3.1% of the population is Multiracial. Los Alamos County ranks 1st statewide in terms of Multiracial residents as a share of the population, out of 33 counties.

Since the 2020 Census, Los Alamos County's Multiracial population has grown by an estimated 15.0%. Multiracial residents' share of Los Alamos County's population has increased from 4.6% to 5.3%.

Los Alamos County is more Multiracial than neighboring Santa Fe County (2.9% Multiracial), Sandoval County (4% Multiracial), Rio Arriba County (1.5% Multiracial), Bernalillo County (3.7% Multiracial), and Taos County (2.3% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.