Henry County is named after Patrick Henry, who is attributed with the slogan “Give me Liberty or Give me Death”. According to the 2017 Census of Agriculture, there were 1,353 farms in Henry County, spanning 484,285 acres, with an average farm size of 358 acres. The population of Henry County was 50,486 (based on 2010 census). Henry County’s temperatures range from 13°F during January to 86°F during July. Average monthly precipitation ranges from 1.52" during January to 4.32" during August. If you're looking for land for sale in Henry County, IL, check out Land Pro LLC's current listings below. If there are no current listings in Henry County, take a look at land for sale in neighboring Bureau County. You can also view all the Illinois land offered for sale by Land Pro LLC.