There was a total of nearly $159 million of farms, ranches, hunting land and other land for sale in Idaho's Bonneville County recently on Land.com. The total size of all Bonneville County land for sale was around 100,000 acres. Bonneville County ranks 29th based on the total amount of acres of land for sale among all the counties in Idaho. Of all locations in Bonneville County with farms, ranches, and rural real estate for sale, Idaho Falls had the most land for sale. Bonneville County is the 16th largest county (1,900 square miles) in Idaho. It's located in the Eastern Idaho region of the state.