Santa Fe Standard

There were 94 fewer people living in Los Alamos County in 2021 compared to 2020, according to population estimates from the US Census Bureau.

This is less than a one percent fall in Los Alamos County’s population, from 19,424 in 2020 to 19,330 in 2021.

Los Alamos County had the 19th largest population in New Mexico in 2021.

The US Census Bureau found more than 73 percent of counties in the US saw a natural decrease in population in 2021. This is up from a 55.5 percent increase in 2020.

The Midwest suffered the most sustained population decreases, with many counties along the US East Coast and through the Rocky Mountains seeing increases.

The US population continues to grow, though at a slower rate than before.

County	2020 Estimated Population	2021 Estimated Population	% Change in Population From Year to Year
Catron County	3,612	3,731	3.3%
Torrance County	15,051	15,307	1.7%
Sandoval County	149,218	151,369	1.4%
Valencia County	76,329	77,190	1.1%
Otero County	67,861	68,537	1%
Union County	4,067	4,107	1%
Lincoln County	20,296	20,436	0.7%
Taos County	34,392	34,623	0.7%
Luna County	25,420	25,532	0.4%
Cibola County	27,076	27,184	0.4%
Colfax County	12,332	12,369	0.3%
Mora County	4,184	4,196	0.3%
Santa Fe County	154,977	155,201	0.1%
San Miguel County	27,115	27,150	0.1%
De Baca County	1,678	1,680	0.1%
Guadalupe County	4,447	4,449	0%
Sierra County	11,526	11,502	-0.2%
Rio Arriba County	40,264	40,179	-0.2%
Bernalillo County	676,581	674,393	-0.3%
San Juan County	121,429	120,993	-0.4%
Los Alamos County	19,424	19,330	-0.5%
Roosevelt County	19,118	19,019	-0.5%
Curry County	48,325	47,999	-0.7%
Quay County	8,721	8,656	-0.7%
Chaves County	65,168	64,629	-0.8%
Grant County	28,209	27,889	-1.1%
McKinley County	72,630	71,780	-1.2%
Socorro County	16,565	16,311	-1.5%
Hidalgo County	4,149	4,074	-1.8%
Lea County	74,586	73,004	-2.1%
Eddy County	62,257	60,911	-2.2%
Harding County	660	639	-3.2%