The overall value of land for sale in Lee County recently on Land.com was almost $29 million. This represents approximately 1,000 acres of farms, hunting land and other rural land and acreage for sale in Lee County. Lee County ranks 37th in the Inland Empire for the combined amount of land currently advertised for sale. Of all land for sale in Lee County, Dixon had the most land for sale. Lee County is Illinois's 21st biggest county (728 square miles). It's located in the Northern Illinois region of the state.