The value of all farmsand rural real estate for sale in Illinois's White County recently was nearly $3 million, representing a combined 75 acres of land for sale in White County. White County ranks 74th out of 102 counties in the Land of Lincoln for the total number of acres of land currently advertised for sale. Carmi had the most land for sale. Economically speaking, White County's is largely dependent on mining and mineral extraction-related businesses and services. White County is the 56th largest county (501 square miles) in Illinois. It's located in the Southern Illinois region of the state.