Logan County is named after physician and state representative John Logan, who was the father of Union General John Alexander Logan. Lincoln Illinois (county seat) was named after Abraham Lincoln, who practiced law there from 1847 to 1859. According to the 2017 Census of Agriculture, there were 683 farms in Logan County, spanning 354,030 acres, with an average farm size of 518 acres. The population of Logan County was 30,305 (based on 2010 census). Its temperatures range from 15°F during January to 86°F during July. Average monthly precipitation ranges from 1.55" during February to 4.42" during May. If you're looking for land for sale in Logan County, IL, check out Land Pro LLC's current listings below. If there are no current listings in Logan County, take a look at land for sale in neighboring DeWitt County, McLean County, and Tazewell County. You can also view all the Illinois land offered for sale by Land Pro LLC.