Of 102 counties in the Prairie State, Mason County is 47th in terms of its size (563 square miles). Mason County is in Western Illinois. There is 1,000 acres of ranches for sale in Mason County, Illinois, based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here is nearly $700,000. Browse all Mason County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Mason County is homesite.