Shelby County is in Central Illinois. Of the 102 counties in the Land of Lincoln, Shelby County is 18th in terms of its size (768 square miles). Browse all Shelby 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 Shelby County is residential property.