Peoria County is named after the Peoria, a Native American people who are, today, part of the Peoria Tribe of Indians of Oklahoma. According to the 2017 Census of Agriculture, there were 884 farms in Peoria County, spanning 250,770 acres, with an average farm size of 283 acres. The population of Peoria County was 186,494 (based on 2010 census). Livingston County’s temperatures range from 14°F during January to 86°F during May. Average monthly precipitation ranges from 1.50" during January to 4.17" during June. If you're looking for land for sale in Peoria County, IL, check out Land Pro LLC's current listings below. If there are no current listings in Peoria County, take a look at land for sale in neighboring Knox County, LaSalle County, Marshall County, Tazewell County, and Woodford County. You can also view all the Illinois land offered for sale by Land Pro LLC.