The value of all land and rural real estate for sale in Gallatin County, Illinois, recently was nearly $4 million, representing a total of 812 acres of land for sale in Gallatin County. Gallatin County ranks 97th out of 102 counties in the Inland Empire for the combined amount of land currently advertised for sale. Among cities in Gallatin County with farms, rural land, hunting land and other land for sale, Omaha had the most land for sale. Gallatin County is Illinois's 88th largest county (328 square miles). It's located in the Southern Illinois region of Illinois.