There was a total of around $76 million of land for sale in Fremont County recently on Land.com. The total of all Fremont County farms, ranches, hunting land and other land for sale was around 4,000 acres. Fremont County ranks 21st in the Gem State for the total acreage of land currently advertised for sale. Of all locations in Fremont County with farms and ranches for sale, Island Park had the most land for sale. Government and state-level services are the main economic drivers in Fremont County. Fremont County is the 17th biggest county (1,896 square miles) in Idaho. It's located in the Eastern Idaho region of the state.