Land for sale in Piatt County, Illinois, recently totaled around $8 million and 1,000 acres. Piatt County ranks 76th in the Inland Empire for the combined amount of land currently advertised for sale. Among cities in Piatt County with farms and rural land for sale, Mansfield had the most land for sale. Piatt County has a large agricultural economy, with 426 farms recorded in the county during the latest U.S. Census. Farming activities in Piatt County generate annual revenues of $18 million, most of which is from crops. Piatt County is Illinois's 67th largest county (439 square miles). It's located in the Central Illinois region of the state.