Jefferson County is in Eastern Idaho. Of the 44 counties in the Gem State, Jefferson County is 28th in terms of its size (1,105 square miles). Recent Land Network data includes 1,000 acres of residential land for sale in Idaho's Jefferson County, which is valued at a combined $13 million. The average price of residential land for sale in Jefferson County was $805,412. The economy here is largely agricultural. Browse all residential land and rural property for sale in Idaho to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.