A total of around 1,000 acres were listed for sale in New Mexico's Los Alamos County recently, representing a combined approximately $15 million in Los Alamos County land for sale. Los Alamos County ranks 30th out of 33 counties in New Mexico for the total number of acres of land currently advertised for sale. Los Alamos featured the most land for sale. Los Alamos County is the 33rd largest county (109 square miles) in New Mexico. It's located in the North Central New Mexico region of the state.