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