The total value of land for sale in Cass County recently on Land.com was nearly $3 million. This represents nearly 1,000 acres of land for sale in Cass County. Cass County ranks 85th out of 102 counties in the Inland Empire for the total acreage of land currently advertised for sale. Of all farms and rural real estate for sale in Cass County, Virginia featured the most land for sale. Manufacturing and related services are the largest economic sectors in Cass County. Cass County is the 78th largest county (383 square miles) in Illinois. It's located in the Western Illinois region of Illinois.