Piatt County is named after James A Piatt, a local resident, was instrumental in forming the county. During 1858, Abraham Lincoln and Stephen Douglas planned their presidential debates in Piatt County. According to the 2017 Census of Agriculture, there were 422 farms in Piatt County, spanning 256,012 acres, with an average farm size of 607 acres. The population of Piatt County was 16,729 (based on 2010 census). Its temperatures range from 14°F during January to 85°F during July. Average monthly precipitation ranges from 1.61" during January to 3.99" during August. If you're looking for land for sale in Piatt County, IL, check out Land Pro LLC's current listings below. If there are no current listings in Piatt County, take a look at land for sale in neighboring Champaign County, DeWitt County, Macon County, and McLean County. You can also view all the Illinois land offered for sale by Land Pro LLC.