Los Alamos is a census-designated location within Los Alamos County, New Mexico. Located on the Pajarito Plateau on the eastern slopes of the Jemez Mountains, the town sits atop four small hills of the Pajarito Plateau and had a population of 13,179 in 2020. It serves as the county's administrative center and one of two population centers within Los Alamos County; the other being White Rock.