The total value of farms and rural land for sale in Piatt County recently on Land.com was almost $13 million. This represents 1,000 acres of farms and rural land for sale in Piatt County. Piatt County ranks 70th out of 102 counties in the Prairie State for the combined amount of land currently advertised for sale. Of all locations in Piatt County with land for sale, Monticello featured the most land for sale. Agriculture and farming drives the Piatt County economy, with 426 farms recorded in the county during the U.S. Census in 2012. Farming activities in Piatt County generate annual revenues of $18 million, most of which is from crops. Piatt County is the 67th biggest county (439 square miles) in Illinois. It's located in the Central Illinois region of the state.