There was a total of nearly $111 million of land for sale in Idaho's Custer County recently on Land.com. The total acreage of all Custer County farms, ranches, hunting land and other land for sale was nearly 4,000 acres. Custer County ranks 32nd out of 44 counties in the Gem State for the total number of acres of land currently advertised for sale. Of all farms, ranches, and rural real estate for sale in Custer County, Mackay featured the most land for sale. Economically speaking, Custer County's is largely dependent on mining and mineral extraction-related businesses and services. Custer County is one of the ten biggest counties in Idaho (4,938 square miles). It's located in the Central Idaho region of the state.