There was a combined approximately $33 million of land and rural real estate for sale in Madison County, Idaho, recently on Land.com. The total acreage of all Madison County farms, ranches, and rural real estate for sale was 3,000 acres. Madison County ranks 42nd in the Gem State for the total acreage of land currently advertised for sale. Of all ranches, farms, hunting land and other rural land and acreage for sale in Madison County, Rexburg featured the most land for sale. Madison County is Idaho's 42nd largest county (473 square miles). It's located in the Eastern Idaho region of the state.