Marshall County is named after John Marshall, Chief Justice of the United States Supreme Court. The population of Marshall County was 12,640 (based on 2010 census). According to the 2017 Census of Agriculture, there were 472 farms in Livingston County, spanning 198,549 acres, with an average farm size of 421 acres. Marshall County’s temperatures range from 15°F during January to 87°F during July. Average monthly precipitation ranges from 1.55" during February to 4.20" during May. If you're looking for land for sale in Marshall County, IL, check out Land Pro LLC's current listings below. If there are no current listings in Marshall County, take a look at land for sale in neighboring LaSalle County, Peoria County, Putnam County, and Woodford County. You can also view all the Illinois land offered for sale by Land Pro LLC.