There was a combined around $14 million of farms, ranches, hunting land and other land for sale in New Mexico's Los Alamos County recently on Land.com. The total acreage of all Los Alamos County land for sale was 1,000 acres. Los Alamos County ranks 30th out of 33 counties in the Land of Enchantment for the total number of acres of land currently advertised for sale. Los Alamos had 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.