The value of farmsand rural real estate for sale in Jefferson County recently on Land.com was almost $20 million. This represents around 1,000 acres of farms and rural real estate for sale in Jefferson County. Jefferson County ranks 63rd in the state for the total number of acres of land currently advertised for sale. Among cities in Jefferson County with land for sale, Fort Atkinson had the most land for sale. Manufacturing and related services are the largest economic sectors in Jefferson County. Jefferson County is Wisconsin's 61st biggest county (582 square miles). It's located in the Southwest Wisconsin region of Wisconsin.