Land for sale in Shelby County, Illinois, recently totaled around $3 million and 1,000 acres. Shelby County ranks 89th in the state for the combined amount of land currently advertised for sale. Herrick had the most land for sale. Its economy is defined as agricultural, with 1,282 farms recorded in the county during the most recent U.S. Census. Farming activities in Shelby County generate annual revenues of $29 million, most of which is from crops. Shelby County is Illinois's 18th biggest county (768 square miles). It's located in the Central Illinois region of the state.