DeWitt County is home to one of the largest lakes in Illinois, Clinton Lake. According to the 2017 Census of Agriculture, there were 504 farms in DeWitt County, spanning 185,936 acres, with an average farm size of 369 acres. The population of DeWitt County was 16,561 (based on 2010 census). Dewitt County was named after New York State Governor, DeWitt Clinton. DeWitt County’s temperatures range from 17°F during January to 88°F during July. Average monthly precipitation ranges from 1.95" during February to 4.54" during July. If you're looking for land for sale in DeWitt County, IL, check out Land Pro LLC's current listings below. If there are no current listings in DeWitt County, take a look at land for sale in neighboring Logan County, Macon County, McLean County, and Piatt County. You can also view all the Illinois land offered for sale by Land Pro LLC.